Aceh Province is one of the coal producers, especially Sumber Batu Village in Meurebo District, West Aceh Regency. In the implementation of coal mining, it is necessary to pay attention to the slope stability of open-pit mining to identify and estimate the possibility of landslides. For this reason, the author conducted research in analyzing the geometric shape of the slope stability with the slope variance of modeling the reduction of the existing angle αeks - 10% to the depth of three layers of soil 11 meters. The 1st layer of soil is 1.5 meters, the second layer of soil is 2.5 meters, and the third layer of soil is 7 meters. Slope stability is strongly influenced by the geometric shape of the slope and the strength of soil parameters. To identify the stability of the slope against slope failure, computationally performed using the finite element method with Plaxis software as the reference for the value of FK 1.25, which is considered safe/stable, meaning that collapse rarely occurs. In this research, primary data is used in the form of direct observation in the field, namely taking soil samples to obtain soil data in the form of soil physical properties and soil mechanical properties into soil parameter data, which is tested in the soil laboratory. Secondary data used are map data, boring data, and Sondir data. Soil parameter data were processed using Plaxis software. The results of the slope stability analysis showed that by modeling the geometric shape of the slope (αeks - 10%) on the open slope of a coal mine with a soil depth of 11 meters, the FK value was 3.60. From the results of the FK scores, it shows that the slope of the slope is 3.60 1.25 above the reference value of safe/stable FK. The FK value is 0.2 greater than the FK existing geometry. The conclusion of this study is that geometric shapes play an important role in determining the stability of an open coal pit excavation slope. The smaller the slope angle, the greater the FK value obtained, or the more gentle the slope, the higher the safety value of a slope.
Earthquake catastrophe in Pidie Jaya has caused damages to the city of Meureudu, Aceh-Sumatra Indonesia. Based on preliminary study for buildings and infrastructures, the geotechnical engineering aspects damages-related are presented. Seismic motion effect damage of earthquakes such as liquefaction of soil, lateral spreads, and ground failure were the majority effect for infrastructures and buildings. Moreover, failures of almost of multi-storey buildings and mosques along the national road lines are because the effect of peak surface accelerations and earthquake wave propagation forces which are very close with epicenter coordinates 5.308°N / 96.269°E in 4km radius. Seismic back investigates of the Aceh's fault seismic source as well as initial probabilistic seismic hazard analysis post-Pidie Jaya earthquake for city of Mereudu is offered. Liquefaction potential analysis from the estimation of peak ground acceleration was conducted. Geotechnical aspect and substructure failure characteristics to infrastructure and housing damages due earthquake are also reported. The earthquake has caused 104 people deaths, 2.474 unit houses in total need to be rehabilitated and rebuilt, almost 10 km of roads and 50 bridges need to be reconstructed. Some descriptive countermeasures for reconstructions of geotechnical engineering aspects and mitigation are also provided.
The city of Banda Aceh is potentially exposed to a significant seismic hazard of seismic site amplification. Estimation of seismic site amplification of the city is urgently required for any mitigation efforts as the city is founded on a thick, soft layer. This study aims to estimate seismic site amplification of Banda Aceh's soil. Analytical models have demonstrated that they can simulate reasonably well the seismic ground motions amplification. The most widely used model is the equivalent linear approach. The approach computes the ground response of horizontally layered soil deposits subjected to transient and vertically propagating shear waves through a one-dimensional soil column. As aforementioned, this study focuses on Banda Aceh-Indonesia which is founded on thick alluvium. Three actual historical time histories and three developed sub-surface models were used to estimate the seismic site amplification of Banda Aceh's soft soil. The used time histories are of 2012 M8.1 Simeulue earthquake, 2013 M6.0 Mane-Geumpang earthquake and 2013 M6.2 Bener Meriah earthquake. Three sub-surface models of three separate sites across the city of Banda Aceh were developed. The site response analysis results reveal the ground motions amplification of Banda Aceh's soils of up to 4.3. Thus, applying the seismic site amplification for structural design at Banda Aceh can be further works.
Earthquake threats that had caused tsunami hazards with a lack of optimal efforts in the construction of evacuation sites, it is necessary to conduct studies on evacuation sites as escape hill. One method of overcoming building construction on the effect of freeboard and run-up level of vertical walls in one of tsunami evacuation models that need to be analyzed for the maximum height that is suitable against the lateral force of tsunami wave. This study’s purpose is to calculate the stability of slope and embankment high on escape hill and calculate the safety factor of soil bearing capacity. The data obtained from the undisturbed sample are then taken to the laboratory for physical and mechanical properties analysis and slope failure of escape hill calculated using the finite element method. This study of maximum embankment height the escape hill for evacuation site, stability obtained at an altitude of 10.0 m and safety factors are 2.14 to 2.84 which is very safe. From the material set design that has been done, it is shown that the modeling of materials set with variations of soil cohesion value (c) and the value of the shear angle in the soil (φ) the safety factor of 2.412.
Tanah yang ada di alam terkadang tidak dapat langsung digunakan sebagai bahan bangunan atau tempat berdirinya bangunan. Hal ini dikarenakan dengan berbagai keterbatasan sifat yang dimiliki oleh tanah tersebut terutama tanah lempung. Usaha yang dapat dilakukan untuk memperbaiki sifat tanah yaitu dengan cara teknik stabilisasi yaitu dengan mencampur bahan-bahan additive dalam tanah asli. Pada penelitian ini digunakan bahan aditif aspal emulsi yang berasal dari PT. Perdana Dinamika Persada, tipe CSS-1h (Cationic slow setting). Tanah yang digunakan dalam penelitian berasal dari Glee Geunteng Kecamatan Peukan Bada Kabupaten Aceh Besar. Pemilihan lokasi ini karena tanah tersebut sering digunakan sebagai bahan timbunan bangunan dan badan jalan. Penelitian ini dilakukan dengan cara pencampuran tanah asli dan aspal emulsi pada variasi 0%, 3%, 6%, 9%, dan 12% dari berat kering tanah. Pengujian yang dilakukan pada penelitian ini terdiri dari pengujian berat jenis, batas cair, batas plastis, pembagian butiran, dan pemadatan (standard proctor), serta pengujian CBR. Tanah Glee Geunteng yang diteliti ini menurut klasifikasi AASHTO tergolong kedalam kelompok A-6 (2) dan menurut USCS termasuk ke dalam golongan SC, di mana indeks plastisnya 12,65%. Hasil penelitian memperlihatkan bahwa pada tanah asli hingga penambahan aspal emulsi 12% nilai CBR mengalami penurunan dari 35,96% menjadi 8,71%.
Aceh is surrounded by the Indo-Australia and Euro-Asia subduction plate, which has a profound effect on the occurrence of large tectonic earthquakes above 5 SR which may cause the tsunami. The tsunami which occurred in Aceh on December 26th, 2004 had the large number of the casualties during the 9.3 magnitude earthquake was affected by the lack of temporary evacuation like escape hill. The government’s lack of preparedness for escape hill in order to deal with several serious threats such as the earthquake which may cause tsunami disaster in Banda Aceh. To deal with this serious threat, it is necessary to prepare a place of salvation to face the tsunami, in this case is an escape hill (artificial hill). The objective of this research is to determine the carrying capacity of the hard bearing layers identification of escape hill design and the amount of the settlement, due to the load of the embankment height (Hcrit) and the safety factor value. This research is conducted in Ulee Lheue Banda Aceh which was calculated by the Plaxis 8.2 finite element analysis. The research results found that the settlement value of 17.45 cm still within in the tolerance limits and the bearing stratum is still able to withstand the embankment load. Furthermore, the safety factor value is 1.04 shows that the bearing stratum is still in the safe condition (hard soil) and it does not indicate the failure.
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