Hendra Gunawan
Jurusan Teknik Sipil, Fakultas Teknik, Universitas Syiah Kuala

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EVALUASI POTENSIAL LIKUIFAKSI PESISIR PANTAI KRUENG RAYA ACEH BESAR PROVINSI ACEH Reza P. Munirwan; Hendra Gunawan
JURNAL TEKNIK SIPIL Vol 1, No 2 (2012): Volume 1, Nomor 2, Januari 2012
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Syiah Kuala

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Abstract: Aceh – Indonesia, is a province that is prone to the earthquake strike because of the position of it which is close to earth fault. There are subduction tectonic fault, Indo-Australia, Euo-Asia tectonic faults, and Sumatra fault.  The aim of this research was to analyse the probability of sand soil failure (liquefaction potency) as the earthquake strike. The earthquake waves when it reaches the saturated of sand soil layer as a cyclic loads, leads the sand soil layers to fail (soil liquefaction). The soil formation will be change due to the cyclic loads and increase the pore water pressure, as a result the soil shear strength will decrease or even loss strength and becomes like fluida. The location of the research is in Krueng Raya beach in Aceh Besar – Aceh province. The data were obtained from N-SPT test and showed that the soil layers are dominant with sand soil layers. Seed et al (1976) and Castro (1975) were used to analyse the liquefaction potency. The research shows that liquefaction occurs in the depth of 3 m – 15 m for Seed et al (1976) method whereas no indication of liquefaction shows from Castro (1975) methods in any depths.Keywords : Liquefaction, subduction, potential, cyclic load, N-SPT.Abstrak: Aceh – Indonesia, merupakan provinsi yang rawan terhadap gempa dikarenakan antara lain Aceh berada di sekitar pantai barat Sumatera yang merupakan daerah pertemuan dari plat tektonik dasar laut (subduksi), plat tektonik Indo-Australia, Euro-Asia, dan patahan Sumatra Fault yang dapat mempengaruhi gempa. Penelitian ini bertujuan untuk menganalisis potensi keruntuhan struktur tanah pasir (potensi likuifaksi) apabila terjadi gempa bumi. Pada suatu lapisan tanah pasir yang jenuh air, getaran-getaran gempa bumi menyebabkan potensi terjadi suatu gejala likuifaksi yang merupakan gejala keruntuhan struktural tanah akibat menerima beban siklis (berulang). Beban siklis ini menimbulkan perubahan-perubahan di dalam deposit, berupa peningkatan tekanan air pori sehingga kuat geser tanah menjadi berkurang atau bahkan hilang (loss strength) sehingga berperilaku seperti fluida. Studi ini dilakukan pada lokasi pantai Krueng Raya Aceh Besar Provinsi Aceh. Berdasarkan data sekunder N-SPT, diperoleh lubang bor yang struktur tanah per lapisan dominan pasir. Potensi likuifaksi dianalisis dengan menggunakan metode-metode analisis Seed et al., (1976), dan Castro (1975). Hasil studi ini menunjukkan bahwa analisis likuifaksi dengan menggunakan metode Seed et al. (1976) terjadi pada kedalaman 3 m - 15 m dengan magnitude lebih besar dari 7,0 SR. Sedangkan analisis dengan menggunakan metode Castro (1975) pada kedalaman yang sama dengan tinjauan Seed et al (1976) likuifaksi tidak terjadi.Kata kunci : Likuifaksi, subduksi, potensi, beban siklis, N-SPT.
KARAKTERISTIK GEOTEKNIK LAPISAN SEDIMEN DI KECAMATAN KUTA ALAM, BANDA ACEH MENGGUNAKAN METODE GELOMBANG PERMUKAAN Khaizal Jamaluddin; Muhammad Budi; Syukri Syurbakti; Hendra Gunawan
JURNAL TEKNIK SIPIL Vol 4, No 3 (2015): Volume 4, Nomor 3, Mei 2015
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Syiah Kuala

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Abstract : Surface wave is the latest method that can estimate the depth, stiffness of the soil.This method has been developed and intensive used in geotechnical at the end of 1999.The study focused on three sites: Beurawe site, Lampulo and Lambaro Skep district of Kuta Alam in Banda Aceh.Field tests using the Multi-channel analysis of surface waves (MASW).In thetest, the sediment layers were characterized by depth and shear wave velocity parameters.The results suggests thatcharacteristics of the soil layer through shear wave velocity parameters per depthcan provide subsurface geotechnical information.It can complement data from the conventional method which has been used.Keywords : Geotechnic, MASW, Shear wave velocityAbstrak : Gelombang permukaan merupakan metode terkini yang dapat mengestimasi kedalaman, kekakuan dari lapisan tanah. Metode ini telah dikembangkan dan mulai digunakan di dalam geoteknik di akhir tahun 1999. Penelitian fokus pada tiga site penyelidikan yaitu site Beurawe, Lampulo dan Lambaro Skep di Kecamatan Kuta Alam Banda Aceh. Pengujian lapangan menggunakan Multichannel Analysis of Surface Waves (MASW). Di dalam pengujian, lapisan sedimen dikarakteristik dengan kedalaman dan parameter kecepatan gelombang geser. Hasilnya memberikan gambaran bahwa karakteristik lapisan tanah melaluiparameter kecepatan gelombang geser per kedalaman dapat memberikan informasi geoteknik bawah permukaan. Hal ini dapat melengkapi data dari metode konvensional yang selama ini digunakan.Kata kunci : Geoteknik, MASW, Kecepatan gelombang geser
PEMETAAN DAYA DUKUNG TANAH DIBEBERAPA DAERAH ACEH BESAR MENGGUNAKAN DATA CONE PENETRATION TEST Devi Sundary; Banta Chairullah; Hendra Gunawan
JURNAL TEKNIK SIPIL Vol 3, No 2 (2014): Volume 3, Nomor 2, Januari 2014
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Syiah Kuala

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Bearing capacity of the soil and the foundation has a close link with the level of safety to the occupants of a building. A foundation design said to be true if the load transmitted by the foundation to the ground does not exceed the power of the land concerned.If the soil strength is exceeded, then a decrease (settlement) excessive or collapse of land will occur, causing damage to the construction which is above the foundation. This research aimsto obtain the value of the soil bearing capacity of shallow foundations in several areas of Aceh Besar, and used as a mapping using ArcGIS 9.2 software. Secondary data used is Cone Penetration Test (CPT) ere obtained from the Laboratory of Soil Mechanics Faculty of Engineering, University of Syiah Kuala. Number of points CPT or sondir is 34 points.  Furthermore, to determine the location of these points in the field using GPS (Global Positioning System). The result shows that most of the area in the study area has a bearing capacity of the land is permitted 50 ton / m2. The area has bearing capacity permits between 50 ton/m2 to 100 ton/m2 occupied area Siem, Cot Gue, Bilui, Adjunct, Baet, Mon Ikeun,Lamkruet, and Lhoknga. Furthermore, the results of the bearing capacity of land used as a mapping so that it becomes a reference in planning the foundation of a building or otherinfrastructure in the region of Aceh Besar.
ANALISIS STABILITAS LERENG PADA RUAS JALAN BLANGKEJEREN - AWEAUNAN KABUPATEN GAYO LUES PROVINSI NANGGROE ACEH DARUSSALAM Hendra Gunawan; Banta Chairullah; Devi Sundary
JURNAL TEKNIK SIPIL Vol 3, No 2 (2014): Volume 3, Nomor 2, Januari 2014
Publisher : Jurusan Teknik Sipil, Fakultas Teknik, Universitas Syiah Kuala

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Roads Blangkejeren - Laweaunan is a one-lane road transport in the Province ofNanggroe Aceh Darussalam, which has an altitude slopes varying between 3.5 to 4.3 m. Earthquakes, rainfall and altitude slopes greatly affect the stability of the slopes on theseroads. The stability analysis aims to obtain a slope stability conditions that meet safety requirements at Jalan Blangkejeren - Laweaunan Gayo Lues District of Nanggroe Aceh Darussalam. Slope stability design using the simplified Bishop method and Plaxissoftware. The use of these methods has given the ease and accuracy in solving the problem of stability of the slope to meet the security requirements of slope stability. Based on the analysis of the simplified Bishop method and Plaxis at Jalan Blangkejeren - Laweaunan STA. 03 + 650, STA. 03 + 700, and STA. 03 + 750 which has a slope of each 63,4°(1H: 2V) concluded that the slope is not safe, so it needs a change of slope. After the change of slope on the slopes of the results showed that the slope of 30°-24°, the slope of qualified safety with a safety factor (STA. 03 + 650), from 1.299 to 1.468 (STA. 03 + 700) from 1.346 to 1.515 (STA. 03 + 750). Based on the results of the slope stability analysis obtained slope collapse semicircular arc (rotational sliding). The slope stability are qualified security that permitted 1 as recommended by Abramson (1996)