FIELD AND LABORATORY INVESTIGATIONS INTO THE BEHAVIOR OF SILTY SANDS THAT LEADS TO LIQUEFACTION TRIGGERING
FIELD AND LABORATORY INVESTIGATIONS INTO THE BEHAVIOR OF SILTY SANDS THAT LEADS TO LIQUEFACTION TRIGGERING
复制标题
对导致液化触发的粉砂行为进行现场和实验室调查
DOI：
--
复制
发表时间：
2016
期刊：
影响因子：
--
通讯作者：
F. Menq
中科院分区：
文献类型：
--
作者：
J. Roberts;K. Stokoe;F. Menq
自20世纪80年代以来，加州帝国谷的野生动物液化阵列（WLA）一直是正在进行的地震和土壤液化研究的焦点。在本文中，从五个独立的土壤液化研究的结果进行了检查和数据相结合，开发一个更全面的分析，在WLA网站的可液化土壤的行为。实验数据来自三种类型的现场试验（CPT，跨孔地震和全尺寸，原位振动试验）和两种类型的室内试验（共振柱和循环三轴）。本文介绍的工作是努力确认和推进现场液化试验，使用大型，液压操作的振动筛，通过检查以前的三个实验的结果，并将它们与实验室测试和数据拟合模型的结果进行比较的一部分。作者认为，超静孔压的产生导致土壤液化的触发是一个应变控制的现象，目前的结果进一步支持这一理论。针对WLA场地可液化土壤的关键发现包括：（1）孔隙压力产生阈值应变（γt）的现场识别，（2）开发孔隙压力产生模型的现场数据，以及（3）开发修改后的双曲线剪切模量折减关系。
Since the 1980s, the instrumented Wildlife Liquefaction Array (WLA) in Imperial Valley, California, has been the focus of ongoing seismic and soil-liquefaction research. In this paper, the results from five separate soil liquefaction studies are examined and the data are combined to develop a more comprehensive analysis regarding the behavior of liquefiable soils at the WLA site. The experiment data are derived from three types of field tests (CPT, crosshole seismic, and full-scale, in-situ shaking tests) and two types of laboratory tests (resonant column and cyclic triaxial). The work presented herein is part of an effort to confirm and advance in-situ liquefaction testing using large, hydraulically-operated shakers by examining the results of three previous experiments and comparing them with the results from laboratory testing and data-fitted models. The authors believe that the triggering of excess pore pressure generation leading to soil liquefaction is a strain-controlled phenomenon and present results in further support of this theory. Key findings specific to the liquefiable soil at the WLA site include: (1) field identification of the threshold strain for pore pressure generation (γt), (2) field data for development of a pore pressure generation model, and (3) development of a modified hyperbolic shear modulus reduction relationship.