EVALUATION OF LIQUEFACTION POTENTIALS OF SOILS USING CONE PENETRATION TESTS
EVALUATION OF LIQUEFACTION POTENTIALS OF SOILS USING CONE PENETRATION TESTS
复制标题
DOI：
10.3208/sandf1972.28.2_49
复制
发表时间：
1988-06
影响因子：
3.7
通讯作者：
T. Shibata;W. Teparaksa
中科院分区：
文献类型：
--
作者：
T. Shibata;W. Teparaksa
对近年来几次地震中的场地液化特性进行了回顾，重点是静力触探（CPT）的qc值和土的粒度。地震循环应力比与标准化圆锥阻力的现场相关性表明，平均粒径D50<0.25mm的细粒土比具有相同qc值的干净砂土（D50≥ 0.25mm）具有更大的抗液化能力。在此基础上，我们已经开发了一种液化评估方法，土壤使用CPT。CPT的标准化临界值（qc_1）cr'是区分可液化和不可液化条件的标准化临界值，它被定义为循环应力比和土的平均粒径的函数。绘制了一个简单的图表，显示了不同地震震级、最大地表加速度和地下水位下临界CPT值（qc）cr'随深度的变化。我们提出的基于CPT的液化评估方法进行了评估的数据在该领域的土壤的已知性能。
A review of field liquefaction behavior during several recent earthquakes was made with emphasis on the Cone Penetration Test (CPT) qc-values and the grain size of the soils. The field correlation between the earthquake-induced cyclic stress ratio and normalized cone resistance indicates that fine-grained soils with a mean grain size of D50<0.25mm have greater resistance to liquefaction than do clean sands (D50≥O.25mm) having the same qc-values. On the basis of this finding, we have developed a liquefaction assessment method for soils using the CPT. The normalized critical value of the CPT, (qc1)cr' which separates liquefiable from nonliquefiable conditions, is defined as a function both of the cyclic stress ratio, and the mean grain size of a soil. A simple chart showing variation in the critical CPT value, (qc)cr' with depth was developed for various earthquake magnitudes, maximum surface accelerations and ground water levels. Our proposed CPT-based liquefaction assessment method was evaluated by data on the known performance of soils in the field.