scholarly journals Analisis Potensi Likuifaksi Akibat Gempa Bumi Menggunakan Metode SPT (Standar Penetration Test) Dan Cpt (Cone Penetration Test) Di Kabupaten Bantul, Yogyakarta

Wahana Fisika ◽  
2017 ◽  
Vol 2 (1) ◽  
pp. 8 ◽  
Author(s):  
Tini Tini ◽  
Adrin Tohari ◽  
Mimin Iryanti
Keyword(s):  
Soil Layer ◽  
Cone Penetration Test ◽  
Standard Penetration Test ◽  
Silty Sand ◽  
Penetration Test ◽  
Cone Penetration ◽  
Ground Acceleration ◽  
Liquefaction Potential ◽  
Liquefaction Hazard ◽  
Better Than

Gempa bumi yang terjadi di daerah Bantul, Yogyakarta pada 27 Mei 2006 dengan magnitudo gempa bumi sebesar 6.3 SR dapat menyebabkan terjadinya bahaya likuifaksi yang dapat merusak bangunan khususnya di wilayah Bantul Yogyakarta. Investigasi geoteknik yang telah dilakukan di Bantul, Yogyakarta dapat memberikan gambaran lapisan tanah yang berpotensi terjadinya likuifaksi. Analisis potensi likuifaksi dilakukan berdasarkan data SPT (Standard Penetration Test) dan CPT (Cone Penetration Test) dengan percepatan maksimum tanah menurut Gutenberg Richter di daerah penelitian rata-rata bernilai sebesar 2.93 m/s2 dan menurut Donovan sebesar 2.88 m/s2. Hasil analisis penelitian menunjukan bahwa lapisan tanah yang berpotensi likuifaksi didominasi oleh jenis tanah pasir lanauan da lanau pasiran yang berada pada kedalaman 0.2 – 3 m, 0.4 m, 2.4 m, 3.6 m, 7.6 – 7.8 m dan 8.2 m. Pengaruh percepatan maksimum tanah menurut Gutenberg Richter lebih besar terhadap terjadinya likuifaksi daripada menurut Donovan. Perbandingan hasil analisis potensi likuifaksi antara data SPT (Standard Penetration Test ) dan CPT (Cone Penetration Test) pada daerah penelitian menunjukan adanya kesamaan potensi likuifaksi pada lapisan tanah dengan kedalaman yang sama diantaranya pada kedalaman 0.2 m-4 m, dengan nilai Cyclic Strees Ratio (CSR) rata-rata sebesar 0.2, sedangkan berdasarkan nilai Cyclic Resistance Ratio (CRR) terdapat perbedaan nlai. Analisis berdasarkan data CPT lebih baik daripada data SPT karena data CPT lebih rapat daripada data SPT.The earthquake that occurred in Bantul, Yogyakarta on May 27, 2006 with the magnitudo of the earthquake of 6.3 SR can caused liquefaction hazard which could damage to teh building in the municipals of Bantul, Yogyakarta. Geotechnical investigation was carried in Bantul Yogyakarta, can give information about liquefaction hazard in soil layer. The liquefaction potential lanalysis was conducted using SPT and CPT methods, with Gutenberg-Richter’s maximum ground acceleration is 2.93 m/s2  and Donovan’s maximum ground acceleration is 2.88 m/s2. Result of liquefaction analysis indicate that the soil layer domination of silty sand dan sandy silt at the depth of 0.2 – 3 m, 3.6 m, 4 m 7.6 – 7.8 m and 8.2 m. Gutenberg-Richter’s maximum ground acceleration having influential for liquefaction potential better than Donovan’s maximum ground acceleration. Ratio result of liquefaction was conducted using SPT same as soil layer with CPT in resech location at the depth 0.2 m-4 m, with value Cyclic Strees Ratio (CSR) is 0.2. Even value Cyclic Resistances Ratio (CSR) have different value. The liquefaction potential lanalysis was conducted using CPT method better than SPT methods.

scholarly journals Implementation and Use of a Mechanical Cone Penetration Test Database for Liquefaction Hazard Assessment of the Coastal Area of the Tuscany Region

Geosciences ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 128
Author(s):  
Stefano Stacul ◽  
Aurora Magalotti ◽  
Massimo Baglione ◽  
Claudia Meisina ◽  
Diego Lo Presti
Keyword(s):  
Cone Penetration Test ◽  
Seismic Sequence ◽  
Test Results ◽  
Penetration Test ◽  
Cone Penetration ◽  
Liquefaction Potential ◽  
Preliminary Screening ◽  
Evaluation Procedures ◽  
Liquefaction Hazard ◽  
Test Database

This paper describes the implementation and use of a mechanical cone penetration test (CPTm) database for the evaluation of the liquefaction potential in some areas of Tuscany. More specifically, the database contains 4500 CPTm covering an area of 1787 square km and mainly concerns some coastal areas of Tuscany. Available simplified liquefaction evaluation procedures (LEPs) are mainly based on piezocone CPT (CPTu) test results and not on CPTm. An early interest on developing LEPs with reference to CPTm became quite soon obsolete because of the widespread use of piezocone. Unfortunately, in Italy, the use of CPTm is very popular. After the 2012 seismic sequence of Emilia-Romagna, the use of CPTm for liquefaction risk analysis has seen a renewed interest, even though such a topic should require further studies. This paper shows an empirical approach for liquefaction triggering assessment by CPTm using existing LEPs, thus making possible the use of the developed CPTm database for the preliminary screening of the study area.

scholarly journals INFLUÊNCIA DE ALGUMAS VARIÁVEIS GEOLÓGICO-AMBIENTAIS NA ESTIMATIVA DA CAPACIDADE DE CARGA DOS SOLOS DE PORTO ALEGRE E PASSO FUNDO POR SPT E CPT

2002 ◽  
Vol 51 ◽  
Author(s):  
ROBERTO HARB NAIME
Keyword(s):  
Rio Grande ◽  
Cone Penetration Test ◽  
Standard Penetration Test ◽  
Rio Grande Do Sul ◽  
Penetration Test ◽  
Cone Penetration ◽  
Porto Alegre

Este trabalho realizou estudos comparativos para testar a influência de algumas variáveis geológico-ambientais na determinação da estimativa da capacidade de carga dos solos, por meio da aplicação de Standard Penetration Test (SPT) e Cone Penetration Test (CPT) na investigação geotécnica. Os estudos foram realizados em cálculos geotécnicos de capacidade de carga dos terrenos. As comparações utilizaram métodos de cálculo recomendados por autores, e de uso intensivo e disseminado, de forma que se tornaram padrões na avaliação da capacidade de carga dos terrenos, e as clássicas comparações entre K (resistência de ponta do cone (q c )/ número de golpes das sondagens à percussão (N) x profundidade e q c x N. Parâmetros de solos residuais e aluvionares de Porto Alegre e de Passo Fundo, no Rio Grande do Sul, foram utilizados. As metodologias utilizadas e os resultados obtidos indicaram que as razões entre as resistências explicitadas pelas capacidades de carga calculadas por SPT e CPT são afetadas por variáveis geológico-ambientais, além dos critérios granulométricos considerados nas interpretações. A natureza geológica dos terrenos apresentou maiores variações nas razões K para os granitos tipo Morrinhos e menores variações para os granitos tipo Cerro Grande. Nas co-variáveis maturidade, condições geomorfológicas e influência de uma zona de falha, testadas em solos derivados dos granitos tipo Cerro Grande, nos solos residuais de Porto Alegre, as variações de estimativa de capacidade de carga e dos diagramas K x profundidade e q c x N mostraram-se significativas, com variações estatisticamente relevantes em todos os cálculos e indicadores testados. Mesmo nos solos aluvionares em Porto Alegre, em terrenos para os quais o CPT foi originalmente projetado, as variações na aferição da resistência dos solos por SPT e CPT foram relevantes em diferentes tipos de aluvião, e ocorreram diferenças no dimensionamento das capacidades de carga; nos diagramas K x profundidade e nas razões entre resistência de ponta do cone e número de golpes das sondagens à percussão. Nos solos de Passo Fundo, os estudos demonstraram que o estágio de maturidade dos solos e as condições geomorfológicas foram fatores relevantes, para o mesmo tipo de solo, derivado da decomposição das rochas basálticas. As conclusões do trabalho indicaram que, para os terrenos considerados, as variáveis geológico- ambientais estudadas e, possivelmente, outras causas, precisam ser consideradas e monitoradas nos trabalhos para determinação mais adequada dos coeficientes de correlação e correção, responsáveis pelas interpretações geotécnicas.

Evaluating cyclic liquefaction potential using the cone penetration test

1998 ◽  
Vol 35 (3) ◽  
pp. 442-459 ◽  
Author(s):  
P K Robertson ◽  
CE (Fear) Wride
Keyword(s):  
Earthquake Engineering ◽  
Sandy Soils ◽  
Cone Penetration Test ◽  
Soil Liquefaction ◽  
Penetration Test ◽  
Cone Penetration ◽  
Liquefaction Resistance ◽  
Liquefaction Potential ◽  
Engineering Research ◽  
Research Workshop

Soil liquefaction is a major concern for structures constructed with or on sandy soils. This paper describes the phenomena of soil liquefaction, reviews suitable definitions, and provides an update on methods to evaluate cyclic liquefaction using the cone penetration test (CPT). A method is described to estimate grain characteristics directly from the CPT and to incorporate this into one of the methods for evaluating resistance to cyclic loading. A worked example is also provided, illustrating how the continuous nature of the CPT can provide a good evaluation of cyclic liquefaction potential, on an overall profile basis. This paper forms part of the final submission by the authors to the proceedings of the 1996 National Center for Earthquake Engineering Research workshop on evaluation of liquefaction resistance of soils.Key words: cyclic liquefaction, sandy soils, cone penetration test

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