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ITS » Paper and Presentation » Teknik Kelautan Posted by ansi@its.ac.id at 18/05/2016 10:36:52 • 2034 Views
STUDI RISIKO KERENTANAN TANAH AKIBAT SOIL LIQUEFACTION KARENA GEMPA BUMI DI WILAYAH PESISIR KOTA PACITAN
Author : WARRIESSANDY, DICKY NANDA ( 4309100054 )
ABSTRAK
Wilayah pesisir kota Pacitan merupakan daerah rawan gempa karena dilalui oleh
Lempeng Indo-Australia dan Lempeng Eurasia. Berdasarkan hasil boring test di 5 titik yang telah dilakukan bahwa kondisi tanah di lokasi studi sebagian besar adalah tanah berpasir yang berpotensi terjadi soil liquefaction. Potensi soil liquefaction dievaluasi berdasarkan nilai SF Safety Factor yang merupakan perbandingan antara CSR Cyclic Stress Ratio dengan CRR Cyclic Resistance Ratio. Untuk penilaian risiko dilakukan dengan menggunakan metode probabilitas likuifaksi dan nilai LPI Liquefaction Potential Index. Hasil analisis yang didapatkan bahwa lokasi yang memungkinkan terjadi fenomena soil liquefaction di wilayah pesisir kota Pacitan yaitu di daerah sisi barat daya Bagak daerah sisi tenggara Bagak daerah Sidorejo daerah sisi barat laut Sidorejo daerah sisi barat Kali Muso daerah sisi timur Kali Muso daerah sisi barat daya Kali Teleng daerah Sidoharjo daerah sisi barat laut Pleren daerah Ngampel daerah sisi utara Kali Muso daerah Selare daerah sisi timur Sidosari daerah Plosomakmur daerah sisi barat Plosorejo daerah sisi timur Plosorejo daerah sisi barat laut Selare daerah Kradenan daerah sisi timur Sidorukun daerah sisi timur Baleharjo daerah Sundeng daerah Betulo daerah Purwoharjo dan daerah sisi timur laut Kuwarasan. Untuk tingkat risiko yang dihadapi akibat terjadinya soil liquefaction yaitu daerah dengan kategori risiko Sangat Tinggi terjadi di daerah sisi barat Kali Muso daerah sisi barat daya Kali Teleng daerah Sidoharjo daerah sisi barat laut Pleren daerah Ngampel daerah Selare daerah Plosomakmur daerah sisi barat Plosorejo daerah sisi barat laut Selare dan daerah Sundeng. Sedangkan daerah dengan kategori risiko Rendah terjadi di daerah sisitenggara Bagak daerah Sidorejo daerah sisi barat laut Sidorejo dan daerah sisi timur Sidorukun.
ABSTRACT
The coastal area Pacitan is earthquake prone areas due to be passed by the Indo- Australian Plate and the Eurasian Plate. Based on the results of test boring at the 5 points that have been made that the condition of the soil in the study area are predominantly sandy soil occurring soil liquefaction potential. Soil liquefaction potential was evaluated based on the value of SF Safety Factor which is the ratio between the CSR Cyclic Stress Ratio and CRR Cyclic Resistance Ratio. For the risk assessment carried out by
using the method of liquefaction probability and the value of LPI Liquefaction Potential Index. The results of the analysis showed that the possible locations of soil liquefaction phenomenon occurred in Pacitan city coastal areas that are in southwest side Bagak area southeast side Bagak area Sidorejo area northwest side Sidorejo areas west side Kali Muso area east side Kali Muso area southwest side Kali Teleng area Sidoharjo area northwest side Pleren area Ngampel area north side Kali Muso area Selare area east side Sidosari area Plosomakmur area west side Plosorejo area east side Plosorejo area northwest side Selare area Kradenan area east side Sidorukun area east side Baleharjo area Sundeng area Betulo area Purwoharjo area and northeast side Kuwarasan area. For the level of risk due to soil liquefaction is the area with the risk category Very High occurs in west side Kali Muso area southwest side Kali Teleng area Sidoharjo area northwest side Pleren area Ngampel area Selare area Plosomakmur area west side Plosorejo area northwest side Selare area and Sundeng area. While areas with risk categories Low occurs in southeastern side Bagak area Sidorejo area northwest side Sidorejo area and east side Sidorukun area.
Source Paper and Presentation of Offshore Engineering RSKe 624.151 36 War s 2014
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