PEMETAAN KAPASITAS DUKUNG TANAH KELURAHAN LEMPUING KOTA BENGKULU

Lempuing is one area in the coastal city of Bengkulu with predominantly sandy soil consistency. This study aims to map the soil bearing capacity of sand Village Lempuing based on data sondir. To achieve these objectives, data collection sondir test at some point spread in the city of Bengkulu Lempuing. Once the data is collected sondir required, further soil bearing capacity calculations for the two types of foundation, the foundation palms (shallow foundation) and pile foundation (the foundation). Capacity analysis results show that the depth of the foundation (Df) ? 1 m, license bearing capacity (qa) for the foundation of the palm of the width (B) 0.6m generate value qa ?1,2 kg / cm2. Meanwhile, the bearing capacity of pile foundation at 6m depth ranging between 35-130 tons. Overall analysis results are displayed in the form of maps of soil bearing capacity. Distribution of value in the map shows that the farther from the coastline, the bearing capacity of the ground at the same depth becomes greater its value

PETA PROBABILITAS LIKUIFAKSI KAWASAN LEMPUING KOTA BENGKULU BERDASARKAN DATA UJI SONDIR

As one of the cities on the west coast of Sumatra Island is located in an active seismic lines, causing Bengkulu city into an area that has the potential for an earthquake. This allows also the potential danger of liquefaction when the earthquake occurred. One of the areas in Bengkulu city is the pathway through which the village Lempuing. This study aimed to analyze the potential for liquefaction at the Village Lempuing using probabilistic methods simplified procedure. Probability model used is the probability model developed by Haldar and Tang (1979). The data collected from the results of the geotechnical investigation sondir 6 point spread in the Village Lempuing. Soil resistance parameters in this analysis are based on test data sondir or Cone Penetration Test (CPT). Shear wave velocity data obtained from the correlation of the data CPT Vs. Seismic load parameters used were obtained from the Indonesian Earthquake Zoning Map of 2010 and the seismic history of the city of Bengkulu. The analysis shows the level of probability of liquefaction hazards at the study site is close to 100%. This suggests that the study site has great potential for liquefaction hazards occur when an earthquake occurs

PEMETAAN POTENSI LIKUIFAKSI WILAYAH PESISIR BERDASARKAN DATA CONE PENETRATION TEST DI KELURAHAN LEMPUING, KOTA BENGKULU

Bengkulu city is one of the cities on the west coast of Sumatra island particularly vulnerable to earthquakes because it is located in an active seismic lines . This vulnerability allows the phenomenon of liquefaction when an earthquake occurs . One of the areas in Bengkulu city which through the lines is Lempuing Village . This study aims to analyze the liquefaction potential based on the data of Cone Penetration Test (CPT) using deterministic methods published by Idriss and Boulanger in 2008 . The data describes soil parameters, collected from the 6 point spread CPT test in Lempuing. Shear wave velocity data obtained from the correlation vs. the CPT data . Seismic load parameters used were obtained from the Indonesian Earthquake Hazard Map of 2010 and the seismic history of the city of Bengkulu. The magnitude of potential liquefaction happens to the value of Safety Factor (SF). The analysis at a depth of 0-2meter showed that most of the area in Lempuing with high potential of liquefaction, indicated by the value of SF is less than 1 . Furthermore , the results of the analysis are  displayed in the form of Liquefaction Potential Map . This map shows that the entire area of Lempuing be in an unsafe condition to the danger of liquefaction during an earthquake with a magnitude > 7.9 earthquake and bedrock acceleration of 0.4 g

PEMETAAN POTENSI LIKUIFAKSI WILAYAH PESISIR BERDASARKAN DATA CONE PENETRATION TEST DI KELURAHAN LEMPUING, KOTA BENGKULU

Kota Bengkulu merupakan salah satu kota di pantai barat Pulau Sumatera yang sangat rentan terhadap gempa karena berada pada jalur seismik aktif. Kerentanan ini memungkinkan turut terjadinya fenomena likuifaksi ketika gempa terjadi. Salah satu wilayah di Kota Bengkulu yang dilalui jalur ini adalah Kelurahan Lempuing. Penelitian ini bertujuan menganalisis potensi likuifaksi di Kelurahan Lempuing berdasarkan data Cone Penetration Test (CPT) dengan menggunakan metode deterministik yang dipublikasikan oleh Idriss dan Boulanger tahun 2008. Data hasil penyelidikan geoteknik yang menggambarkan parameter tahanan tanah, dikumpulkan dari 6 titik uji CPT yang tersebar di Kelurahan Lempuing. Data kecepatan gelombang geser diperoleh dari hasil korelasi Vs terhadap data CPT. Parameter beban gempa yang digunakan diperoleh dari Peta Hazard Gempa Indonesia tahun 2010 dan riwayat kegempaan Kota Bengkulu. Besarnya potensi likuifaksi yang terjadi dinyatakan dengan nilai faktor keamanan (FS). Hasil analisis menunjukkan bahwa pada kedalaman 0 sampai 2meter, sebagian besar wilayah Lempuing termasuk ke dalam wilayah dengan potensi likuifaksi tinggi, ditunjukkan dengan nilai FS kurang dari 1. Selanjutnya, hasil analisis ditampilkan dalam bentuk Peta Potensi Likuifaksi. Peta ini menunjukkan bahwa seluruh wilayah Kelurahan Lempuing berada dalam kondisi tidak aman terhadap bahaya likuifaksi saat terjadi bencana gempa dengan magnitudo > 7,9 dan percepatan gempa di batuan dasar sebesar 0,4g