Analisis Mitigasi Potensi Likuifaksi (Studi Kasus : Proyek Pembangkit Listrik Tenaga Gas Dan Uap Lombok, Nusa Tenggara Barat) (original) (raw)
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2019
Kabupaten Bandung adalah salah satu daerah yang berada di Jawa Barat dengan posisi sering dijumpai dampak dari gempa yang berada di sekitar jalur sesar lokal dan zona subduksi. Kecepatan gelombang geser mengevaluasi ketahanan likuifaksi yang disebabkan oleh gelombang seismik sehingga dapat ditentukan potensi likuifaksi yang dapat dilihat dari faktor keamanan likuifaksi daerah Kabupaten Bandung. Penelitian data sekunder menghasilkan 8 titik lokasi yang dihubungan dengan geologi regional. Perhitungan dilakukan dengan melihat parameter berat isi, tegangan efektif, tegangan total, faktor reduksi serta percepatan tanah maksimum untuk memperoleh rasio tekanan siklik, rasio ketahanan siklik, dan faktor keamanan serta menganalisis kecepatan gelombang geser terhadap potensi likuifaksi. Percepatan maksimum tanah menggunakan rumus empiris Boore (1997) yang dihubungkan dengan magnitudo gempa yaitu bernilai 6,5 memiliki rentang nilai yaitu 0,29 hingga 0,37 g. Rasio tekanan siklik (CSR) menunjuka...
2021
Indonesia merupakan daerah yang rawan terhadap gempa bumi karena berada di titik pertemuan tiga lempeng bumi, yaitu Lempeng Pasifik, Lempeng Eurasia, dan Lempeng Indo-Australia. Daerah yang rawan gempa di Indonesia, antara lain adalah wilayah Nusa Tenggara. Daerah dengan potensi gempa yang tinggi dapat menjadi sangat berbahaya untuk daerah yang memiliki tanah dengan jenis pasir karena dapat menimbulkan potensi likuifaksi. Likuifaksi adalah kejadian dimana tanah dengan konsistensi very loose – medium dense yang jenuh kehilangan kekuatannya akibat adanya getaran yang kuat seperti gempa bumi. Oleh sebab itu, untuk merencanakan bangunan pada daerah rawan gempa dengan kondisi tanah pasir, harus dilakukan analisa zona likuifaksi. Saat ini, terdapat Terminal Bahan Bakar Minyak di kota Ampenan, Lombok yang kondisi tanahnya pasir dengan konsistensi loose hingga medium dense dan daerah tersebut merupakan daerah yang rawan terhadap gempa. Terminal Bahan Bakar Minyak tersebut menggunakan pondas...
Analisis Potensi Likuifaksi di Area PLTU Pacitan
Rekayasa Sipil
One of Indonesia's regions, Pacitan, is an earthquake-prone area where one of the consequences of the earthquake is the phenomenon of soil liquefaction. Soil liquefaction is the process of changing or transforming the form from a solid to a liquid form. The purpose of this study was to analyze the potential for liquefaction based on field data at the finite element PLTU Sudimoro Pacitan or FEM method. There are three location plans for the liquefaction potential analysis point, namely C-36, S-58, and TC-32 based on earthquake data. Point C-36 has the possibility of liquefaction. For the point S-58 has conditions that will definitely experience liquefaction. Meanwhile, Point TC-32 has the possibility of liquefaction. The subsidence that occurs due to the earthquake load has a large enough impact on land subsidence, namely at point C-36
Analisis Potensi Likuifaksi dengan Metode Deterministik di Wilayah Surabaya
Reka Buana : Jurnal Ilmiah Teknik Sipil dan Teknik Kimia, 2019
Surabaya has an earthquake potential reach to 6.5 Mw. Moreover, on average, Surabaya area is a lowland which is alluvial deposits. Thus, it is required to perform potential liquefaction. Liquefaction potential analysis was performed by taking the soil data from the center of Surabaya. The initial of liquefaction potential analysis was conducted by considering soil gradation, relative density (DR), fine content (FC), degree of saturation (SR) dan SPT number. However, the advanced analysis was undertaken by utilizing Youd and Idriss 2001 dan metode Idriss 2008. The results of initial of liquefaction potential analysis show that the soil has potential to be liquefied at the depth 1-7m, however at the depth 22m the soil is not liquefied. Furthermore, the results of advanced analysis and conclusions of the analysis show that the soil has a liquefied potential at the depth 17 m from the surfaceABSTRAK Kota Surabaya memiliki potensi gempa yang terjadi bisa mencapai 6.5 Mw. Selain itu, Wila...
2013
Salah satu dampak yang disebabkan oleh gempa bumi adalah hilangnya kekuatan lapisan tanah akibat getaran yang disebut dengan likuifaksi. Peristiwa likuifaksi akibat gempa bumi dapat menyebabkan kerusakan berat dan kegagalan infrastruktur. Dalam hal ini, PT. PLN ( PERSERO ) UIP KIT SULMAPA PLTU 2 SULAWESI UTARA 2 X 25 MW POWER PLAN menjadi lokasi evaluasi potensi likuifaksi, dengan menggunakan data Standard Penetration Test (SPT) dan Cone Penetration Test (CPT). Analisis potensi likuifaksi ini bertujuan untuk mengetahui nilai faktor keamanan (FS) dengan membandingkan nilai Cyclic Resistance Ratio (CRR) yang merupakan tahanan tanah terhadap terjadinya likuifaksi dan Cyclic Stress Ratio (CSR) yang merupakan tegangan geser yang ditimbulkan oleh gempa. Peristiwa likuifaksi akan terjadi untuk angka keamanan (FS) lebih kecil dari satu. Hasil perhitungan nilai CSR adalah sama untuk kedua metode tersebut, dikarenakan lokasi titik pengujian yang ditinjau jaraknya berdekatan. Sedangkan nilai C...
Jurnal Riset Fisika Indonesia
Liquefaction causes physical damage on land and has potential to cause more fatalities. In addition, southern part of Bali Island is one of the tourist destination areas with quite high liquefaction potential due to soil condition and large number of potential earthquakes. Research on liquefaction potential analysis at Serangan, Southern Bali was conducted by using probabilistic and ground penetrating radar (GPR) methods. This research aims to obtain information on shallow layers, land subsidence dueto earthquakes theoretically, and probability of liquefaction occurrences in the area of Serangan, Southern Bali by considering several parameters, such as Bali earthquake (2020) and Lombok earthquake (2018). The GPR data was processed by ReflexW 7.0 software, and probabilistic by Microsoft Excel 2010. The probabilistic and GPR results indicated ground water level was at 2 m depth and the liquefaction occurrence was 92.22% with ground acceleration of 0.5749 gal at 3.5 m in depth, which w...
Jurnal Rekayasa Konstruksi Mekanika Sipil (JRKMS), 2019
One of the impacts caused by an earthquake is the strength loss of the soil due to cyclic stresses calledliquefaction. Liquifaction usually occurs in loose sand. The objective of this study is to determine thepotential of liquefaction in observed project. The project observed in this study is reclamation project.Analysis for potential liquefaction is done using the Simplified Procedure Method. Firstly, determinethe value of peak acceleration in bedrock in the study area based on the 2010 Indonesian EarthquakeHazard Map. Secondly, collect soil data based on CPT-u testing. Based on these data, the accelerationvalue (Amplification/Deamplification) can be found on each soil layer when being moved from thebedrock to the ground surface. By comparing the average shear stress caused by the acceleration ofthe earthquake to the effective vertical stress at each soil layer, we can obtain the value of CyclicStress Ratio. Lastly, calculate CRR (Cyclic Resistant Ratio) which is the value of soil ...
Kajian Potensi Likuifaksi Pasca Gempa Dalam Rangka Mitigasi Bencana DI Padang
Jurnal Rekayasa Sipil (JRS-Unand)
Pada tanggal 30 September 2009 pukul 17:16:09 Wib, sebuah gempa tektonik di lepas pantai Padang, Sumatera, dengan 7,6 Scala Richter (SR) terdaftar (United States Geological Survey, USGS, 2009). Pusat gempa terletak sekitar 71 km di bawah permukaan bumi dan sekitar 60 km Barat dari kota Padang. Hara (2009) diperkirakan berdasarkan tinggi frekuensi radiasi dan perpindahan maksimum amplitudes, bahwa durasi gempa 15,4 detik. Daerah yang paling terkena dampak adalah Kota Padang, Kota Pariaman, Kabupaten Padang Pariaman, Kabupaten Agam, dan Pesisir Selatan. Untuk kota Padang khususnya banyak bangunan dan perumahan yang roboh dan sarana jalan yang rusak (rengkah), hipotesis sementara telah terjadi peristiwa likuifaksi. Peristiwa likuifaksi merupakan kehilangan kekuatan tanah akibat terjadinya getaran didalam tanah, dimana terjadi peningkatan tekanan air pori. Penelitian ini dilakukan dengan tujuan untuk menelusuri kembali potensi likuifaksi di kota Padang akibat gempa 30 September 2009. Da...
Analisis Potensi Likuifaksi di Tapak Reaktor Daya Eksperimental Serpong
2017
The phenomenon of changing the nature of the sediment from solid state to a liquid state caused by shear stress at the time of an alternating earthquake is called liquefaction. Liquefaction can cause severe damage. Liquefaction analysis aims to determine the potential for liquefaction at the site of RDE especially the reactor building. The analysis was done by simplified method by using Standard Penetration Test (SPT) data. From these data, then can be calculated Cyclic Stress Ratio (CSR), Cyclic Resistant Ratio (CRR) and Safety Factor (SF). Based on the calculation analysis, it is concluded that the reactor building area has a potentially liquefaction soil layer at depth of 2 to 6 meters and at depth 24 meters.
2012
Evaluation of liquefaction potential by the conventional way are based on deterministic methods. The methods use only one condition of earthquake load as parameter in liquefaction analysis. Actually, the strength of earthquake loads are varies. In the other words, there is the uncertainty magnitude of earthquake loading. The uncertainty can be taken into analysis only by using a probabilistic approach. This study describes how to analyze liquefaction by probabilistic method. The method used was performance-based evaluation, developed by Kramer and Mayfield (2005, 2007). This method include contributions from all levels of magnitude earthquake (hazard levels) in liquefaction analysis. The research location is in Padang, West Sumatra. Soil Investigation data used are N-SPT and shear wave velocity spread in the city of Padang. Earthquake load parameters used were obtained from PSHA and deagregation analysis. The results of this study show the variation of liquefaction potential across ...