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PENGARUH PEMANCANGAN FONDASI TIANG PADA TANAH LEMPUNG JENUH TERHADAP TEKANAN AIR PORI Pratama, Gumbert Maylda; Adi, Agus Darmawan; Fathani, Teuku Faisal
Jurnal Teknik Sipil Vol 14, No 4 (2018)
Publisher : Program Studi Teknik Sipil Fakultas Teknik Universitas Atma Jaya Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (514.155 KB) | DOI: 10.24002/jts.v14i4.2004

Abstract

Abstract: Installation of driving pile foundation is causing excess pore water pressure on saturated clay. Experimental study of driving pile installation effect on clayey silt is conducted at laboratory scale through pore water pressure value observation. The pore water pressure value was read using pressure transducers and head-meters, which has been installed at different depth of the soil sample. The experiment was carried out on two different soil samples. Sample 1 requires 146 strokes to fully drive, and Sample 2 requires 50 strokes. The pore water pressure value was affected by pile penetration depth. The pore water pressure at the bottom of the sample is higher than pore water pressure at the top of the sample. Excess pore water pressure at the sample with more stroke numbers is greater than the sample with less stroke numbers. Pore water pressure change values at Sample 1 are 0,04 kg/cm2 at the top of the sample and 0,10 kg/cm2 at the bottom, while at Sample 2 are 0,02 kg/cm2 at the top of the sample and 0,06 kg/cm2 at the bottom.Abstrak: Pemancangan fondasi tiang mengakibatkan perubahan tekanan air pori pada tanah lempung jenuh. Pengujian pengaruh pemancangan pada perubahan tekanan air pori dilakukan melalui studi eksperimental menggunakan tanah lanau lempungan di laboratorium, dengan pembacaan perubahan nilai tekanan air pori. Pembacaan tekanan air pori dilakukan dengan alat pressure transducer dan head-meter yang dipasang pada variasi kedalaman tanah. Pengujian dilakukan pada dua sampel tanah yang berbeda. Pada Sampel 1 dibutuhkan 146 kali pukulan hingga tiang mencapai kedalaman rencana, sedangkan pada Sampel 2 dibutuhkan 50 kali pukulan. Nilai tekanan air pori dipengaruhi oleh kedalaman penetrasi fondasi tiang pada saat pembacaan. Nilai perubahan tekanan air pori di bagian bawah lebih tinggi dibandingkan perubahan tekanan air pori yang terjadi di bagian atas. Perubahan tekanan air pori lebih besar terjadi pada sampel dengan jumlah pukulan yang lebih banyak. Pembacaan perubahan tekanan air pori pada Sampel 1 bagian atas sebesar 0,04 kg/cm2 sedangkan bagian bawah sebesar 0,10 kg/cm2, pada Sampel 2 bagian atas sebesar 0,02 kg/cm2 sedangkan bagian bawah sebesar 0,06 kg/cm2.
PERENCANAAN SISTEM PERINGATAN DINI BENCANA TANAH LONGSOR DI DUSUN LUCU PALONGAN DESA CAMPOAN KECAMATAN MLANDINGAN KABUPATEN SITUBONDO JAWA TIMUR Mukhlis, Teuku; Fathani, Teuku Faisal; Sudarno, Ign.
Civil Engineering Forum Teknik Sipil Vol 18, No 3 (2008): SEPTEMBER 2008
Publisher : Civil Engineering Forum Teknik Sipil

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (887.359 KB)

Abstract

Lucu Palongan Sub-village is located at hills terrain which is critically prone to soil mass movement due to the morphological characteristic of plateu with steep slopes in addition to geological setting of volcanic breccia bedrock covered by colluvial sediments. The research is initiated by soil mass movement occurrence in Lucu Palongan Sub-villag. It is situated in community’s farm land which is a typical ground faulting with soil cracks subsided by 3 meters at the crown area. The study is conducted to identify the causal factors and mechanism of soil mass movement, to observe the condition of the affected areas and society, to discover the areas vulnerable to landslide effects and to plan early warning system for landslide disaster. The primary data for the research is gathered from field investigation. Analysis on the slope stability is carried out by employing SLOPE/W program. The study identifies that soil mass movement in Lucu Palongan Sub-village is a typical slide. The causal factors of soil mass movement at the researched areas are the farm lands existed on the slopes causing water on land surfaces accumulated, thence the intensity of water slipping into subsurface increases, shear strength of soil significantly diminishes due to saturation. The most vulnerable areas to landslide are Bretan and Batuampar Sub-village of Selowogo Village. The indications of soil mass movement were initially noticed by the residents of Lucu Palongan Sub-village through landslide monitoring instrument. Afterward, the information was communicated to the people of Bretan and Batuampar Sub-village.
MITIGASI BENCANA BERBASIS MASYARAKAT PADA DAERAH RAWAN LONGSOR DI DESA KALITLAGA KECAMATAN PAGETAN KABUPATEN BANJARNEGARA JAWA TENGAH Parlindungan R., Ranto; Fathani, Teuku Faisal; Karnawati, Dwikorita
Civil Engineering Forum Teknik Sipil Vol 18, No 3 (2008): SEPTEMBER 2008
Publisher : Civil Engineering Forum Teknik Sipil

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Abstract

This research was carried out due to the occurrence of mass movement in Kalitlaga Village Pagentan Sub-District Banjarnegara District, which was one of most dangerous area to mass movement in Province Central Java. Such movement resulted in damaged houses and road. This research was conducted to recognize and identify the direction and type of mass movement, to identify the triggering parameters and the cause of mass movement in order to provide an appropriate disaster mitigation recommendation and prevention method, as well as to introduce low cost early warning system based on community which enabled the community to prepare and operate the system in lessening the disaster risks. Secondary and primary data used in this research were derived from field investigation and study. The method of the study is analyzing the results of field study. To obtain the percentage of people understanding on disaster mitigation, landslide, and early warning system, interviews were conducted and the interviews outputs were processed using the SPSS software. Result shows that the landslide is predominantly northeastern ward and slump type of movement. To the number of leaky water pipe and infiltrations into the ground induce the mass movement. This movement is due to geological factors such as geomorphology factor and existence of clay stone as well as high rainfall factor. The community low understanding on disaster mitigation represents the reason to install simple and cheap early warning system community based disaster mitigation. Such mitigation is easier to apply than technology based mitigation. It is also more suitable prior to a disaster. Community participation and also support from government are the key efficacy of disaster mitigation.
Analisis Biaya Hidup Aset pada Infrastruktur Pengangkatan Air Baku di Daerah Karst (Hal. 20-27) Arifin, Muhammad Luqman Nur Rouf; Fathani, Teuku Faisal; Priyosulistyo, Henricus
RekaRacana: Jurnal Teknil Sipil Vol 4, No 3: September 2018
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (343.463 KB) | DOI: 10.26760/rekaracana.v4i3.20

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ABSTRAKKawasan karst Gunungsewu yang terbentang dari Kabupaten Gunung Kidul, Wonogiri hingga Pacitan memiliki banyak lembah kering dan mengalami kelangkaan air permukaan. Kekeringan melanda saat musim kemarau datang, sedangkan pada saat musim penghujan, umumnya air ditampung di penampungan air hujan (PAH) sederhana. Adanya program Pengangkatan Air Tenaga Surya (PATS) di beberapa lokasi di Kawasan karst Gunungsewu telah berhasil membantu warga dalam mengurangi masalah kekeringan. Penelitian ini menganalisis biaya hidup aset infrastruktur pengangkatan air baku menggunakan energi terbarukan (PATS) dan Pengangkatan Air Tenaga Diesel (PATD) di daerah karst. Lokasi yang dipilih adalah di Dusun Banyumeneng, Kabupaten Gunung Kidul yang mulai beroperasi tahun 2016. Analisis biaya hidup aset meliputi biaya awal, biaya perawatan dan perbaikan, biaya penggantian komponen dan biaya penghapusan. Hasil analisis nilai kini aset menunjukkan bahwa nilai pada akhir umur layan PATS Banyumeneng sebesar (+)Rp66.240.298,00 untuk penggunaan energi surya, dan (-)Rp30.997.539,00 untuk penggunaan energi diesel. Nilai positif pada hasil analisis biaya hidup aset PATS menunjukkan bahwa infrastruktur PATS Banyumeneng menguntungkan secara ekonomi untuk dibangun dan beroperasi menggunakan tenaga surya.Kata kunci: biaya hidup aset, pengangkatan air tenaga surya, pengangkatan air tenaga diesel, nilai kini asset, karst Gunungsewu ABSTRACTThe Gunungsewu karst area which stretches from Gunung Kidul Regency, Wonogiri to Pacitan has many dry valleys and experiences a scarcity of surface water. Drought occurs when the dry season comes, while during the rainy season, water is generally stored in simple rainwater storage (PAH). The existence of a Solar Water Pumping System (PATS) in several locations in the Gunungsewu karst area has succeeded in helping residents in reducing drought problems. This study analyzes the life cycle cost of water supply infrastructure using renewable energy technology (PATS) and diesel technology (PATD) in the karst area. The chosen location was in Banyumeneng Hamlet, Gunung Kidul Regency which began operations in 2016. Analysis of life cycle cost includes initial costs, maintenance and repair costs, replacement costs and salvage value. Present value of assets show that the value at the end of the service life of PATS Banyumeneng is (+)Rp66,240,298.00 for the use of solar energy, and (-)Rp 30,997,539.00 for the use of diesel energy. The positive value on the results of the PATS life cycle cost analysis shows that the PATS Banyumeneng infrastructure is economically profitable to build and operate.Keywords: life cycle cost, solar water pumping system, diesel powered water pumping system, present value of asset, Gunungsewu karst area
ANALISIS RESPON DINAMIK TANAH BERPOTENSI LIKUIFAKSI PADA UNDERPASS YOGYAKARTA INTERNATIONAL AIRPORT (YIA) Rahman, Muhamad Agung; Fathani, Teuku Faisal; Rifa'i, Ahmad
Rang Teknik Journal Vol 4, No 1 (2021): Vol. 4 No. 1 Januari 2021
Publisher : Fakultas Teknik Universitas Muhammadiyah Sumatera Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (929.779 KB) | DOI: 10.31869/rtj.v4i1.1919

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Underpass Yogyakarta International Airport (YIA) terletak di pesisir pantai selatan jawa dekat dengan pertemuan lempeng tektonik. Kondisi geologi di lokasi Underpass YIA termasuk formasi geologi endapan alluvial, dimana sepanjang underpass ditemukan lapisan tanah berupa lempung pasiran dan pasir. Aktivitas seismik serta kondisi geologi dan geoteknik menyebabkan wilayah Underpass YIA rentan terhadap gempa bumi berpotensi likuifaksi. Penelitian ini bertujuan untuk menganalisis respon dinamik tiap lapisan tanah berpotensi likuifaksi dengan ragam spektrum Multi Degree of Freedom serta memodelkan lapisan tanah berupa shear building. Evaluasi bawah permukaan didasarkan pada data pengeboran dan N-SPT serta data tanah pada 5 titik di sepanjang Underpass YIA. Nilai percepatan batuan dasar ditentukan berdasarkan peta gempa SNI 1726-2012. Piranti lunak MATLAB digunakan sebagai alat bantu dalam perhitungan analisis perilaku dinamik. Hasil analisis menunjukkan bahwa nilai simpangan tiap lapisan tanah semakin mendekati permukaan cenderung semakin besar karena nilai kekakuan tanah semakin mengecil. Kekakuan tanah yang semakin kecil menghasilkan nilai frekuensi sudut semakin kecil dan periode getar semakin besar mendekati permukaan tanah. Hasil analisis menunjukkan adanya potensi likuifaksi pada kedalaman 4-6 m dari permukaan tanah jika terjadi gempa bumi dengan nilai percepatan muka tanah maksimum (amax) lebih besar dari 0,44g.
Pengaruh Lapisan Penutup Pada Lendutan Pelat yang didukung Tiang dalam Uji Dua Dimensi Yogha Caniggia; Hary Christady Hardiyatmo; Teuku Faisal Fathani
Jurnal Tekno Global Vol 8, No 1
Publisher : UNIVERSITAS INDO GLOBAL MANDIRI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (660.997 KB) | DOI: 10.36982/jtg.v8i1.739

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ABSTRACTSubgrade in some areas of Indonesia has a very low soil bearing capacity. To overcome the problem, ground can be covered by subbase with using Nailed-slab System which is supported by mini concrete pillars. Soil material can be modeled in a pile of aluminum cylinders as a covering layer and a bamboo stick as a subgrade. Plates and pillars which are used in Nailed-slab System are made of fiberglass material with the thickness is 0.5 cm. The length of the plate (B) consists of 4 kinds, while the length of the pillar (L) consists of 3 variations. The numbers of pillar variations in this experiment consists of 1 to 4 pillars with the spacing of inter pillar is (s) = 10 cm. The load placement of the Nailed-slab System is done centrically and edge. The results showed that the installation of the pillar had a major effect in reducing the plate deflection and increasing the value of the soil reaction modulus (k). The number of pillars which are set to 4 are capable of reducing the deflection greater than the fewer set number of  pillars (2 pillars). The minimum deflection occurring on flat ground due to centric loading can be reduced by 11.73%, while in the embankment land is 9.3%. As a result of edge loading, the number of 4 pillars on flat ground is capable of reducing the minimum deflection up to 9.09% more than 2 pillars. In soil embankment due to reduced deflection edge loading up to 7.91% more than 2 pillars. The comparison of the observed deflection was greater than Beam on Elastic Foundation (BoEF) program calculation results.Keywords : Nailed-slab System, subgrade reaction modulus (k), deflection, BoEFABSTRAKTanah dasar di beberapa daerah Indonesia mempunyai kuat dukung tanah yang rendah.Untuk mengatasi hal tersebut maka tanah dasar dapat dihamparkan lapis penutup dan digunakan Sistem Pelat Terpaku yang didukung oleh tiang-tiang beton mini. Material tanah dimodelkan dalam bentuk tumpukan silinder aluminium sebagai lapisan penutup dan lidi bambu sebagai tanah dasar (subgrade).Pelat dan tiang yang digunakan dalam Sistem Pelat Terpaku terbuat dari bahan fiberglass dengan ketebalan bahan yaitu 0,5 cm.Ukuran panjang pelat (B) terdiri dari 4 macam, sedangkan panjang tiang (L) terdiri dari 3 variasi. Variasi jumlah tiang dalam pengujian ini terdiri dari 1 tiang sampai 4 tiang dengan jarak antar tiang (s) = 10 cm. Hasil penelitian menunjukkan bahwa pemasangan tiang memberikan pengaruh yang besar dalam mereduksi defleksi pelat dan meningkatkan nilai modulus reaksi tanah dasar (k). Jumlah tiang 4 mampu mereduksi defleksi lebih besar dari jumlah tiang yang lebih sedikit (2 tiang). Defleksi minimum yang terjadi pada tanah datar akibat pembebanan sentris mampu tereduksi sebesar11,73%,sedangkan pada tanah timbunan sebesar 9,3%. Akibat pembebanan tepi, jumlah 4 tiang di tanah datar mampu mereduksi defleksi minimum sebesar 9,09% dibandingkan dengan 2 tiang. Pada tanah timbunan akibat pembebanan tepi defleksi tereduksi sebesar 7,91% dibandingkan dengan 2 tiang. Perbandingan defleksi hasil pengamatan yang dilakukan lebih besar dibandingkan dengan defleksi hasil analisis perhitungan program BoEF(Beam on Elastic Foundation).Kata kunci :Sistem Pelat Terpaku, modulus reaksi tanahdasar(k), defleksi, BoEF
Identification of subsidence hazard zone by integrating engineering geological mapping and electrical resistivity tomography in Gunung Kidul karst area, Indonesia Wahyu Wilopo; Doni Prakasa Eka Putra; Teuku Faisal Fathani; Slamet Widodo; Galeh Nur Indriatno Putra Pratama; Maris Setyo Nugroho; Wisnu Rachmad Prihadi
Journal of Degraded and Mining Lands Management Vol 9, No 2 (2022)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2022.092.3281

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The presence of natural cavities in karst morphology may cause severe civil engineering and environmental management problems. Karst formations will limit the expansion of urbanization, especially infrastructure development in limestone areas. Geophysical methods, especially electrical resistivity tomography (ERT) techniques, are effective and efficient solutions to detect voids below the surface. This study aimed to develop a subsidence hazard map as basic information for infrastructure development. The identification was made by measuring electrical resistivity tomography on eight profiles in the infrastructure development plan. In addition, it was also supported by geological mapping, particularly the structural geology and types of rocks around the site. The research area consists of massive limestone, bedded limestone, and cavity limestone with generally north-south joints. The analysis of geological mapping data and electrical resistivity tomography measurements showed that the cavity limestone was identified with a north-south elongated pattern in line with the fracture pattern found on the surface at the research area. The surface lithology type, the geological structures density, and the subsurface lithology were used to develop a subsidence hazard map. This information is beneficial in determining the safe location of infrastructure development based on disaster risk mitigation.
Effect of Well Resistance on Time Factor Ratio Due to PVD Deformation Galuh Chrismaningwang; Hary Christady Hardiyatmo; Agus Darmawan Adi; Teuku Faisal Fathani
Journal of the Civil Engineering Forum Vol. 7 No. 3 (September 2021)
Publisher : Department of Civil and Environmental Engineering, Faculty of Engineering, UGM

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jcef.64381

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One of the most common soft soil enhancement techniques used to expedite the consolidation time significantly is Prefabricated Vertical Drains (PVD). This technique needs a sufficient discharge capacity value because it primarily functions as a drainage channel. The deformation of PVD is considered as one of the primary factors which affect discharge capacity. Therefore, this research determined the influence of upper-side deformation on PVD's discharge capacity (qw) using a specific design apparatus known as ASTM D4716, which manages the determination of transmissivity and flow rate at the longitudinal direction of geosynthetics. Furthermore, two PVD samples with dimensions of 3 and 4 mm thickness, 100 mm width, and 1000 mm length were examined under straight and buckled conditions. Stepwise confining pressures from 50 to 200 kPa were subjected to the samples under hydraulic gradients with values of 0.2, 0.5, and 1.0. The results showed that samples with greater thickness had higher discharge capacity, which significantly reduced in the lower hydraulic gradient. The deformation on the upper side of PVD induced a decrease of discharge capacity by approximately 13-16%, which led to a delay in the consolidation time. The discharge capacity values obtained from the experiments were employed as parameters in a time factor ratio of Th,w/Th. The analysis results show that the buckled PVD has a more considerable consolidation time due to the increase in the Th,w/Th ratio, with a discharge capacity value below 10-4 m3/s. It can be concluded that the deformation in the form of buckled conditions on the upper side of PVD had a considerable impact on PVD effectiveness.
The Using of GIS to Delineate the Liquefaction Susceptibility Zones at Yogyakarta International Airport Nicholas Hartono; Teuku Faisal Fathani
Civil Engineering Dimension Vol. 24 No. 1 (2022): MARCH 2022
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (876.579 KB) | DOI: 10.9744/ced.24.1.62-70

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Spatial analysis is performed to delineate liquefaction susceptibility zones at Yogyakarta International Airport(YIA). The low to medium cohesionless soil consistency is predominantly observed on the upper subsoil. A shallow groundwater level and low fines content have also enlarged the likelihood of earthquake-induced liquefaction. An SPT based liquefaction triggering procedure is adopted in this study to indicate the Factor of Safety (FoS) whereas the Liquefaction Severity Index (LSI) is used to measure the severity of liquefaction by presuming its manifestation. Inverse Distance Weighted (IDW) interpolation in QGIS is chosen to produce a map with 50 m × 50 m grid size. The analysis results show the YIA’s area is prone to undergo liquefaction at various depths. However, thin liquefied layers may not generate sufficient artesian flow pressure to eject water or sand. The LSI analysis concludes that YIA area is categorized as a non-liquefied to moderate severity where the West side is the governing area
Rainfall Thresholds for Landslide Prediction in Loano Subdistrict, Purworejo District Central Java Province Farma Dyva Ferardi; Wahyu Wilopo; Teuku Faisal Fathani
Journal of Applied Geology Vol 3, No 1 (2018)
Publisher : Geological Engineering Department Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (4415.662 KB) | DOI: 10.22146/jag.40001

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Purworejo Districtis a district with high disaster risk index in Indonesia, especiallylandslide. The main factor that triggers the landslide is rainfall. However, therehas been no comprehensive research on the intensity of rain that triggered the landslide in Purworejo District, especially in the Sub district of Loano. Huge landslide occurred in Loano Sub district at 2016, causing 46 deaths and damages in several houses. Therefore, it is necessary to study the prediction of landslide based on rainfall data and geological conditions of Loano Sub district, Purworejo District. The objective of this research is to analyze the mechanism of landslide, to analyze the rainfall that triggers the landslide and to estimate the intensity of rain that can triggers the landslide. The research method is collecting historical data of landslides in Purworejo District along with rainfall data, geological observation that includes the condition of lithology, geomorphology and hydrogeology,undisturbed soil sampling in Loano Sub district. The prediction of landslide uses empirical methods which were then simulated by Geostudio 2012 Software. The results show that the type of landslide is sliding, the main control factor is the steep slope and the thickness of the soil. The rainfall threshold triggering landslide are as follows for lithology andesite breccia I = 81.782 D????1.197, sandy clay I = 92.579 D????0.13, and andesite intrusionI = 145.32 D????0.338.