DEVELOPMENT OF AN IN SITU DYNAMIC LIQUEFACTION TEST
DEVELOPMENT OF AN IN SITU DYNAMIC LIQUEFACTION TEST
复制标题
原位动态液化测试的开发
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
K. Stokoe
中科院分区：
文献类型：
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作者：
E. Rathje;Wen;K. Stokoe
一种新的现场测试技术已经发展起来，在该技术中，土的液化和孔压产生特性的现场测试。原位动态液化试验利用大型液压振动器动态加载土壤存款。土壤响应是用嵌入式仪器测量的。嵌入式仪器包括新开发的液化测试传感器，将速度传感器（地震检波器）和孔隙压力传感器集成在一个外壳中。记录的数据被用来描述孔压的产生和液化特性的剪切应变和诱导孔压比之间的关系。分析技术用于计算剪切应变的粒子速度测量进行了讨论和比较。测试结果从1.2-m的1.2-m的1.2-m的重建现场测试样本。剪切应变孔隙压力的关系，在选定的数量的加载周期，确定从原位动态液化试验进行比较与其他调查人员在实验室中测量。现场测量的关系显示出与实验室测量的关系相同的形状，但现场数据表明孔隙压力产生的阈值应变较小（0.005%）。这种差异归因于重构现场样本中的低有效应力。
A new field-testing technique has been developed in which liquefaction and pore pressure generation characteristics of soil are measured in situ. The in situ dynamic liquefaction test utilizes a large, hydraulic shaker to load dynamically a soil deposit. The soil response is measured with embedded instrumentation. The embedded instrumentation includes newly developed liquefaction test sensors that incorporate velocity transducers (geophones) and pore pressure transducers in a single case. The recorded data are used to describe pore pressure generation and liquefaction characteristics in terms of the relationship between shear strain and induced pore pressure ratio. The analytical techniques used to compute shear strain from particle velocity measurements are discussed and compared. The results from testing a 1.2-m by 1.2-m by 1.2-m reconstituted field test specimen are presented. The shear strain—pore pressure relationships at selected numbers of loading cycles that were determined from the in situ dynamic liquefaction test are compared with those measured by other investigators in the laboratory. The field-measured relationships show the same shape as the lab-measured relationships, but the field data indicate a smaller threshold strain for pore pressure generation (∼0.005 %). This difference is attributed to the low effective stresses in the reconstituted field specimen.