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ANALISIS PENGARUH CAMPURAN PUPUK UREA TERHADAP KUAT GESER TANAH LEMPUNG LUNAK DENGAN UJI TRIAXIAL Sutejo, Yulindasari; Dewi, Ratna; Haryadi, Dwi; Kurniawan, Reffanda
CANTILEVER Vol 4, No 1 (2015): Cantilever
Publisher : Jurusan Teknik Sipil & Perencanaan Fakultas Teknik Universitas Sriwijaya

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The soilÂ plays an important roleÂ inÂ a construction site. One type is the soft clay soil that has a value compressibility and high water levels so low soil shear strength that reduce the bearing capacity of the soil. In this study conducted by the method of soil improvement, soilÂ stabilization using a mixture of ureaÂ fertilizer with percentage of 5 %,Â 10 %,Â and 15 % with a treatment period of 3 , 7,Â and 14 days with Triaxial test. Soft clay soil samples taken in the area around UNSRI, Inderalaya, OI, South Sumatra. The test results of soil properties, w 35.20 %; 2.53 Gs; PL 21.14 %; LL 42 % and IP 20.86 %. According to the USCS, the soil categorized CL, while according to AASHTO, the soil is categorized class A-7-6. Results of Triaxial testing , the value of cohesion (c) 5 % maximum on the addition of ureaÂ fertilizer (14 days) is 1.138 kg /cm2 . While the value of shear angle (f) and shear strength (Ï) maximum on the addition of 15 % ureaÂ fertilizer (3 days) of 26,42o and 3.93 kg /cm2 .Key Words : UreaÂ Fertilizer, Shear Strength, Triaxial, Soft Clay

DEFORMASI DAN KEKUATAN GESER PASIR PADA PERCOBAAN GESER LANGSUNG Kurniawan, Reffanda
JURNAL MEDIA TEKNIK Vol 11, No 2 (2014): Media Teknik Edisi Mei - Agustus
Publisher : JURNAL MEDIA TEKNIK

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ABSTRACT The river is one of the water transport infrastructure have a crucial role in the movement for national development. One of which is to establish a means of supporting the court around the musi River, then it can be utilized as a place of tourism for the people of the city of Palembang and for trade. The Court is required to build the first retaining the musi River in order to shore up the buildings on it. One of the retaining required is turap. Turap is a part of the structure of the building thatserves as a holding ground and resist water ingress into the retting. Turap type, soil type and soil structure became a benchmark for shear strength of the soil at the cliff of Musi river retaining. In this paper, the kind of turap that is used to support the ground that is cantilever turap because the soil is on the musi River is a sandy silt. In addition analysis of depth turap also performed on development cliff of Musi river retaining 11-14 Ulu Palembang of South Sumatra.Keywords : Turap, River, Cantilever

EFISIENSI ALAT BERAT PADA PELEBARAN JALAN KOLONEL H. BARLIAN PALEMBANG Kurniawan, Reffanda
JURNAL MEDIA TEKNIK Vol 8, No 3 (2011): JURNAL MEDIA TEKNIK
Publisher : JURNAL MEDIA TEKNIK

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ABSTRACTThe highway is the means of transportation that support the development and growth of a region. Some regions of Indonesia means the road could not be said to be well. Because of that, the Government of South Sumatra region, particularly the city of Palembang Government trying to build new roads. One of them is widening streets Kol. H. Barlian Palembang. Heavy equipment is one of the important factors in a construction project. Productivity efficiency use of heavyequipment on widening streets Kol. H. Barlian Palembang needed to optimize the use of your budget and time. Heavy equipment work production calculated on the basis of work and flexible tool at work, namely the foundation layer of aggregate class A, class B, the foundation layer of aggregate, AC-Base layer, layers and layers of AC-BC AC-WC, for rigid and road foundation layers, and is the surface layer. So it can be concluded that the activity of the foundation of aggregate class A and class B the delay does not occur.While on aggregate employment AC-WC, AC-BC and AC-Base was timely because the tools used in accordance with theplanned. An excess of heavy equipment on the project of widening streets Kol. H. Barlian of Palembang, on the type of dump trucks.

PENGARUH LIMBAH PLAFON GIPSUM TERHADAP PENURUNAN KONSOLIDASI PADA TANAH LEMPUNG EKSPANSIF Dewi, Ratna; Sutejo, Yulindasari; Rahmadini, Rizki; Arfan, Muhammad; Rustam, Reffanda Kurniawan
CANTILEVER Vol 8, No 1 (2019): Cantilever
Publisher : Jurusan Teknik Sipil dan Perencanaan Fakultas Teknik Universitas Sriwijaya

Expansive clay has a high potential to swell if compared to other types of clay. Expansive clay also has very low bearing capacity so that a method of soil improvement was needed to improve the soil. This type of soil can be found in Gasing village, Tanjung Api-Api Km. 11 Banyuasin regency of South Sumatra Province. This research aims to study the mixture of gypsum plafond waste as additives in the process of stabilizing expansive soil clay. It can be made according to the needs of the mixture. In this study, the percentage of mixture of gypsum plafond waste are 5 %, 10 % and 15%. The test used an Oedometer (SNI 2812: 2011/ASTM D2435) equipment. By giving the pressure of 2.5 kN/m2; 5 kN/m2; 10 kN/m2; 20 kN/m2; and 40 kN/m2. The test results of the clay without mixture with gypsum plafond obtained were liquid limit value (LL) = 67%, plastic limit (PL) = 26.38% and plastic index value (PI) of 40.62%. Spesific Gravity (Gs) = 2.696, optimal water content (wopt) = 21.55 % and optimal dry weight (wopt) = 1.55 gr/cm3. Therefore, the soil sample was an expansive clay type and classified as A-7-6 (AASHTO classification). Consolidated test results show that soil compression index (Cc) = 0.190. After mixed with gypsum plafond waste of 15 %, the compression index value (cc) = 0.080. This indicates that the compression index value (cc) has decreased. Based on the above, it can be concluded that the mixture of gypsum waste in expansive clay causes soil settlement.

PEMANFAATAN ABU AMPAS TEBU SEBAGAI BAHAN CAMPURAN DENGAN SOIL BINDER TERHADAP NILAI CBR TANAH LEMPUNG Yulindasari Sutejo; Ratna Dewi; Citra Indriyanti; Ridhuan Andika; Reffanda Kurniawan Rustam
Simposium II UNIID 2017 Vol 2 (2017)
Publisher : Simposium II UNIID 2017

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Salah satu parameter yang diperlukan untuk mengetahui kondisi suatu tanah adalah nilai CBR (California Bearing Ratio). Pada penelitian ini, nilai CBR dikaitkan dengan perancangan tebal perkerasan. Nilai CBR diperoleh berdasarkan proses pencampuran tanah dengan bahan tertentu. Adapun campuran yang digunakan yaitu Soil Binder (SB) dan Abu Ampas Tebu (AAT). Soil Binder dengan variasi campuran 20 gram/liter air, 25 gram/liter air, 30 gram/liter air. Dan campuran Abu Ampas Tebu sebesar 4 %, 8 %, dan 12 %. Waktu perawatan sampel selama 0, 7, 14 (hari). Adapun hasil penelitian yang telah dilakukan menunjukkan tanah di daerah Jl. Tanjung Api-Api Desa Gasing Kecamatan Talang Kelapa Kabupaten Banyuasin, berdasarkan sistem klasifikasi AASHTO digolongkan A-7-6 sedangkan berdasarkan klasifikasi USCS digolongkan kelompok CH. Nilai CBR tanah asli sebesar 14.75 %. Adapun nilai CBR tertinggi diperoleh pada variasi campuran SB 30 gr/liter air dan AAT 12 % dengan waktu perawatan selama 14 hari sebesar 32.37 %. Nilai DDT tertinggi yaitu dengan variasi campuran SB 30 gr/liter air dan AAT 12 % dengan waktu perawatan selama 14 hari sebesar 8.193.

KARAKTERISITIK KUAT GESER TANAH MERAH Reffanda Kurniawan Rustam; Amiwarti Amiwarti
Simposium II UNIID 2017 Vol 2 (2017)
Publisher : Simposium II UNIID 2017

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Tanah lunak bisa mengakibatkan adanya ketidakstabilan dan proses penurunan dalam waktu yang lama. Hal ini dikarenakan tanah lunak bersifat mampat yang besar dan kuat geser rendah. Salah satu tipe tanah yang termasuk ke dalam jenis tanah lunak yaitu tanah lempung lunak. Tanah merah termasuk ke dalam jenis tanah lempung lunak. Oleh karena itulah tujuan penelitian ini untuk mengetahui karakteristik kuat geser tanah merah di Pakjo Palembang. Hasil pengujian index properties tanah merah memiliki nilai kadar air (  27,70 %), batas cair (LL = 66,00 %), batas plastis (PL = 25,13 %), berat jenis tanah (Gs = 2,67), dan indeks plastisitas (IP =40,87 %). Hasil sistem klasifikasi USCS adalah tanah lempung (CH). Dan berdasarkan sistem klasifikasi AASHTO adalah A-7-6 (clavey soils). Hasil pengujian Direct Shear 16-18 kPa. Hasil pengujian Direct Shear yaitu kohesi (c =13,25-16,15 kPa), sudut geser dalam (ϕ = 13,25o - 16,25o ), kuat geser (τ = 15,32-18,25 kPa). Dan hasil pengujian Triaxial yaitu kohesi (c = 16,25- 18,15 kPa), sudut geser dalam (ϕ = 13,50o -14,75o ), kuat geser (τ =17,68-24,02kPa). Nilai kuat geser tanah merah di atas menunjukkan bahwa tanah tersebut termasuk tanah lunak (12,5-25 kPa). Analisa perhitungan penahan tanah, kestabilan lereng, dan daya dukung tanah dibutuhkan parameter seperti sudut geser dalam (ϕ), kohesi (c), dan kuat geser (τ).

Kajian Stabilitas Lereng dengan Perkuatan Geotekstil dan Dinding Penahan Tanah Kantilever di Ruas Jalan Padang-Lb. Selasih Sumatera Barat Syahril Alzahri; Adiguna; Bimo Brata Adhitya; Yulindasari Sutejo; Reffanda Kurniawan Rustam
Cantilever: Jurnal Penelitian dan Kajian Bidang Teknik Sipil Vol 9 No 1 (2020): Cantilever
Publisher : Department of Civil Engineering and Planning, Faculty of Engineering, Sriwijaya University

A typical relatively steep slope makes the Lb. Selasih – Bts. Kota Padang KM.29+650 experienced a landslide in 2017. So, it is necessary to strengthen the slope to overcome the landslide. Alternative slope reinforcement used is reinforcement using cantilever retaining walls or geotextiles. Slope stability analysis before and after were analyzed using the Slope/W program. The output produced by Slope/W program is the value of the safety factor. The safety factor value for the state of the original slope is 1.100. It shows that the slope in the original condition is unstable and vulnerable to landslide hazards. The retaining wall has a height of 11 m and a base plate width of 8 m. The results of the analysis showed that the cantilever retaining wall securely with stands shear, rolling, and bearing capacity of the subgrade with a safety factor value of 1.620; 1.550; 2.160, while geotextile reinforcement has a height of 16 m and an ultimate tensile strength of 200 kN / m. The results of the analysis showed that the reinforcement of the geotextile safely sliding, stability, and bearing capacity of the subgrade with a safety factor value of 1.600; 2.330; 2.860. Both of these reinforcements are safe to stabilize the slope by increasing the value of the slope safety factor by 2.235 for strengthening the cantilevered retaining wall and 2.279 for strengthening the geotextile.

Pemodelan Perkuatan Menggunakan Bambu Untuk Daya Dukung Pondasi Dangkal pada Tanah Gambut Yulindasari Sutejo; Sutanto Muliawan; Ratna Dewi; Febrian Hadinata; Budi Ariawan; Reffanda Kurniawan Rustam
Cantilever: Jurnal Penelitian dan Kajian Bidang Teknik Sipil Vol 9 No 2 (2020): Cantilever
Publisher : Department of Civil Engineering and Planning, Faculty of Engineering, Sriwijaya University

Some of the unfavorable characteristics of peat soil are low bearing capacity and high compressibility. The reinforcing material used in this research which functions the same as geogrid are bamboo materials (grids and woven). The bamboo material used aims to determine the carrying capacity and reduction of shallow foundations on peat soil before being reinforced and after being reinforced. Bamboo matting and rectangular patterned bamboo grids. Laboratory scale testing were used as the research methodology. The peat soil sampling location came from the area of Dusun III Banyu Urip, Banyuasin Regency, South Sumatra Province. The bamboo material is obtained from the Seberang Ulu area, Palembang City and sand is obtained from the sand depot in the Musi II area, Palembang City. The results of laboratory testing show that the addition of the number of reinforcement layers and the effective layer depth distance will give a greater bearing capacity ratio (BCR) value. The bearing capacity value of the shallow foundation before being reinforced on peat soil using Terzaghi's analysis is 45.232 kpa. Then, after testing the variation in the depth of the layer d = 0b; d = 0.25b; and d = 0.5b with the number of layers 1 layer, 2 layers and 3 layers obtained a variation which gives the highest bearing capacity value of layer depth variations d = 0.25b with the number of layers of 3 layers. The bearing capacity value is 94 kpa with a BCR value of 2.08 (percent increase of 107.96 %).

DEFORMASI DAN KEKUATAN GESER PASIR PADA PERCOBAAN GESER LANGSUNG Reffanda Kurniawan
Jurnal Media Teknik Vol 11, No 2 (2014): JURNAL MEDIA TEKNIK
Publisher : Universitas PGRI Palembang

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ABSTRACT The river is one of the water transport infrastructure have a crucial role in the movement for national development. One of which is to establish a means of supporting the court around the musi River, then it can be utilized as a place of tourism for the people of the city of Palembang and for trade. The Court is required to build the first retaining the musi River in order to shore up the buildings on it. One of the retaining required is turap. Turap is a part of the structure of the building thatserves as a holding ground and resist water ingress into the retting. Turap type, soil type and soil structure became a benchmark for shear strength of the soil at the cliff of Musi river retaining. In this paper, the kind of turap that is used to support the ground that is cantilever turap because the soil is on the musi River is a sandy silt. In addition analysis of depth turap also performed on development cliff of Musi river retaining 11-14 Ulu Palembang of South Sumatra.Keywords : Turap, River, Cantilever

EFISIENSI ALAT BERAT PADA PELEBARAN JALAN KOLONEL H. BARLIAN PALEMBANG Reffanda Kurniawan
Jurnal Media Teknik Vol 8, No 3 (2011): JURNAL MEDIA TEKNIK
Publisher : Universitas PGRI Palembang

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ABSTRACTThe highway is the means of transportation that support the development and growth of a region. Some regions of Indonesia means the road could not be said to be well. Because of that, the Government of South Sumatra region, particularly the city of Palembang Government trying to build new roads. One of them is widening streets Kol. H. Barlian Palembang. Heavy equipment is one of the important factors in a construction project. Productivity efficiency use of heavyequipment on widening streets Kol. H. Barlian Palembang needed to optimize the use of your budget and time. Heavy equipment work production calculated on the basis of work and flexible tool at work, namely the foundation layer of aggregate class A, class B, the foundation layer of aggregate, AC-Base layer, layers and layers of AC-BC AC-WC, for rigid and road foundation layers, and is the surface layer. So it can be concluded that the activity of the foundation of aggregate class A and class B the delay does not occur.While on aggregate employment AC-WC, AC-BC and AC-Base was timely because the tools used in accordance with theplanned. An excess of heavy equipment on the project of widening streets Kol. H. Barlian of Palembang, on the type of dump trucks.

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