Seventeen percentages of Sumatra is covered with peat deposits. Some 1.6 million Ha is deposited in the East coast of South Sumatra. More over, 63.503 Ha is found in Ogan Ilir Regency. Laboratory soil tests are performed to determine the engineering properties of the peat. Generally the tests use undisturbed samples obtained with a block sampling from sites in Ogan Ilir Regency, but the physical tests for specific gravity, water content, and ignition loss occasionally employ disturbed samples. The tests for the determination of the engineering characteristics involve shear strength, consolidation, and permeability tests. The test results show that the peat soil in Ogan Ilir can be classified as fibrous peat with degree of decomposition (H4–H5 in von Post scale) and fiber content > 20 %. The average natural moisture content of the peat is 441,933 %. The average results of direct shear test showed the effective cohesion (c’) and the effective angle of internal friction (’) are 7.62 kPa and 19.930. The average coefficient of rate of consolidation (cv) obtained from Oedometer test ranged from 3.20 from 0.93 for pressure range of 25 to 400 kPa. In general, the results show similar values with the reference data of other peat soils.
Most of the land in South Sumatera is the problematic soil, one of that is peat. Peat has low soil bearing capacity, and it becomes a problem when construction is built. Before the installation process, it is necessary to handle that soil. Soil improvement that can be done on peat to increase the bearing capacity value is the reinforcement method or physical stabilization. The results of research on woven bamboo and cerucuk are used as reinforcement material, which is expected to be an alternative to improve soil bearing capacity. The research methodology used was on the scale of the laboratory and analyzed by comparing the soil bearing capacity without reinforcement in bearing capacity ratio (BCR). The maximum bearing capacity with cerucuk reinforcement and without woven bamboo is 39.33 kPa with variations of the two outer rods of the left and right sides from 750 angle toward the foundation plane. However, using the 3 layers of reinforcement woven bamboo that is combined with cerucuk, which has diameter 1,5 cm and length 60 cm generates the highest soil bearing capacity value. The maximum of bearing capacity is 58 kPa. The BCR is 10,88 or in percentage is 988,2%, or 10 times greater than bearing capacity without reinforcement. So, it can be inferred that woven bamboo and cerucuk are used as an alternative to improve bearing capacity on peat soil.
Landslide is one of the most common problems in improving road structures. One of the landslide cases occurred in the area of Kikim Besar, Lahat District precisely at Km.256. To obtain an optimal solution of the problem requires proper analysis in the reinforcement of the slope. In this study used an alternative slope reinforcement by using sheet pile or geogrid reinforcement. The purpose of this research is to know the condition of natural slope stability at that location and the effect of stability slope change with retrofitting structure using sheet pile or geogrid. This research uses modeling with Plaxis 2D program. Modeling was made to obtain the safety factor values on the natural slopes on the slopes 1-1, 2-2, and 3-3 pieces, comparing the safety factor of each slope before and after the reinforcement, and comparing the safety factor of each slope after reinforcement using geogrid type UX 1700 and sheet pile type W 325 A 1000. From the research results obtained that the strengthening of geogrid and sheet pile can increase the value of slope safety factor. The sheet pile modeling has the greatest safety factor value for each slope of 1.794 for slopes 2-2 and 1,532 for slopes 3-3 compared with geogrid reinforcement that produces a safety factor value of 1,325 for slopes 2-2 and 1,343 for slopes 3-3 pieces.
Landslides is estimated to increase in the future as the impact of climate change, especially in changing of precipitation patterns, both of intensity and duration. Landslides are influenced by the rainfall duration that has a long duration and in infiltration capacity. The effect of infiltration of ground water causes volumetric water content increases and groundwater table recharge, which converts unsaturated soils become saturated soil. The longer infiltration causes soil cohesion decrease which is an indication of soil strenght decrease. It can be described by the relationship between the IDF(Intensity-Duration Frequency) curve, Hydraulic Conductivity curve, Soil Water Characteristic curve of slope stability analysis. This research will model the slope stability conditions at baseline (condition 30 years back) and when the projection (condition 30 years future) using the program SLOPE/w.
ABSTRAKTingginya persentase perilaku meyontek yag dilakukan oleh mahasiswa di kampus (50-70%). Belajar berdasar regulasi diri sangat diperlukan untuk mencegah perilaku menyontek di dunia pendidikan. Tujuan penelitian ini untuk mengetahui hubungan antara belajar berdasar regulasi diri dengan perilaku menyontek mahasiswa di Pekanbaru. Penelitian ini bersifat kuantitatif dengan korelasi Product Moment. Subjek penelitian ini adalah mahasiswa Universitas Islam Riau yang berjumlah 150 orang dipilih secara acak dengan teknik cluster sampling. Belajar berdasarkan regulasi diri sebagai variable bebas dan perilaku menyontek sebagai variable terikat. Skala belajar berdasarkan regulasi diadaptasi dari skala Jusar dan kala perilaku menyonyek diadaptasi dari Priaswandy. Dipenelitian terdapat hubungan negatif antara belajar berdasar regulasi diri terhadap perilaku menyontek. Hubungan negatif tersebut menunjukkan bahwa semakin tinggi perilaku menyontek, maka semakin rendah belajar berdasar regulasi dirinya. Begitu juga sebaliknya, semakin rendah perilaku menyontek, maka semakin tinggi belajar berdasar regulasi dirinya. Mahasiswa disarankan untuk bisa membuat skala prioritas dalam aktivitas sehari-hari, skala prioritas mengerjakan tugas perkuliahan, manajemen waktu dan tidak menunda-nunda mengerjakan tugas perkuliahan. Kata Kunci: Belajar, Regulasi diri, Perilaku menyontek PENDAHULUANPerilaku menyontek atau melakukan kecurangan dilakukan hampir 50-75 persen siswa dan mahasiswa (Baird 1980;Stevens and Stevens 1987). Perilaku menyontek merupakan tindakan menyimpang dan atau curang yang melanggar norma social dilakukan seseorang untuk mendapatkan keuntungan (Albrecht, 2006; Manik,2013). Islam juga melarang manusia untuk berbuat curang dan berbohong, Nabi Shallallahu'Alaihi Wasallam bersabda; ا َّ ن مِ نْ َ م َ و ا َ َّن ش َ غ َ ْس ي َ ل َ ف Artinya: "Barang siapa menipu kami, maka ia tidak termasuk golongan kami." (HR. Muslim)Di dunia pendidikan dalam beberapa tahun terakhir, perilaku menyontek menjadi semakin sering terjadi (McCabe &Trevino,1997), mulai tingkat pendidikan SD, SMP, dan SMA dan terbawa sampai ke perguruan tinggi ( Murdock, Hale & Weber, 2001;
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