考虑沉积时间效应的原位砂土抗液化强度剪切波速评价  

Shear wave velocity-based evaluation of liquefaction resistance of in-situ sand with aging effects

作　　者：周燕国[1] 周鑫辉 桑毅佳 石安池 陈云敏[1] ZHOU Yanguo;ZHOU Xinhui;SANG Yijia;SHI Anchi;CHEN Yunmin(Institute of Geotechnical Engineering,Center for Hypergravity Experiment and Interdisciplinary Research,MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering,Zhejiang University,Hangzhou 310058,China;PowerChina Huadong Engineering Corporation Limited,Hangzhou 311122,China)

机构地区：[1]浙江大学岩土工程研究所,浙江大学超重力研究中心,浙江大学软弱土与环境土工教育部重点实验室,浙江杭州310058 [2]中国电建集团华东勘测设计研究院有限公司,浙江杭州311122

出　　处：《岩土工程学报》2023年第S02期19-24,共6页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(52278374,51988101,51978613);高等学校学科创新引智计划(B18047)。

摘　　要：剪切波速是评价饱和砂土抗液化强度的常用指标之一。在基于初始液化标准的砂土抗液化强度剪切波速表征模型(即“周-陈模型”)的基础上,进一步引入考虑沉积时间效应的修正系数,分别对原位测得的剪切波速和重塑砂土抗液化强度进行修正,使得“周-陈模型”能适用于原位砂土抗液化强度评价。针对云南巧家县某工程场地,进行原位剪切波速测试、现场取样并开展室内单元体试验,得到了“周-陈模型”的关键表征参数,据此建立了相应的地震液化剪切波速判别方法。利用该判别方法对该工程场地砂土层不同钻孔土层进行了地震液化判别,并与国内外其它液化判别方法进行比较,发现判别结果基本一致。本文发展的考虑沉积时间效应的剪切波速表征模型为评价实际工程场地原位砂土抗液化强度提供了有效手段。The shear wave velocity is one of the commonly used parameters to evaluate liquefaction resistance of sandy soils.In this study,based on the initial liquefaction criterion-based shear wave velocity characterization model(i.e.,the“Zhou-Chen model”),two correction parameters are intruduced to consider the aging effects to correct the field measured shear wave velocity and the liquefaction resistance of reconstituted sand,respectively,so that the“Zhou-Chen model”can be used to evaluate the liquefaction resistance of in-situ sandy soils.In an engineering case from Qiaojia County,Yunnan Province,both field measurements of shear wave velocity and laboratory testings are conducted to determine the parameters of the“Zhou-Chen model”,and then a simplified procedure to evaluate liquefaction potential using the field shear wave velocity measurement is established.This simplified procedure is then used to evaluate the liquefaction potential of the engineering site,and the results are consistesnt with those by other methods.The proposed characterization model with further consideration of the aging effects provides a promising way to evaluate the liquefaction resistance of in-situ sandy soils with the ageing effects.

关 键 词：抗液化强度 原位砂土 沉积时间效应 剪切波速 表征模型 

分 类 号：TU435[建筑科学—岩土工程]