液化后地面下沉量的估计  

Estimation of Settlements in Sand Deposits after Liquefaction

作　　者：江静贝[1] 谢振福[2] 符圣聪[1] 

机构地区：[1]中国建筑科学研究院工程抗震研究所,北京100013 [2]海口市地震设防中心,海南海口570206

出　　处：《工程抗震与加固改造》2009年第1期108-113,共6页Earthquake Resistant Engineering and Retrofitting

摘　　要：饱和砂样的室内循环试验表明,对于给定的相对密度,液化后重固结的体积应变随剪应变幅值的增加而增加,并且最后趋于最大体积应变。大量的液化砂层数据分析表明,绝大多数场地饱和砂层下沉的支配因素是最大体积应变。本文提出利用由试验所确定的最大体积应变和标准贯入锤击数间的关系来估计液化后地面下沉量的方法。用所建议的方法估计了13个液化场址的下沉量,所得到的估计值与野外观察的下沉量或地震灾害有较好的吻合。根据该途径所给出的地面下沉量可作为衡量场地可能出现液化的轻重程度,从而决策是否采取抗液化措施。The cyclic loading test data shows that the post-liquefaction volumetric strain for given the relative density increase with the increasing maximum shear strain in a soil, and finally go to its maximum volumetric strain. By examining a bulk of data from liquefaction sites, the factor controlling the post-liquefaction settlements in sand deposits is the maximum volumetric strain. The methods for estimating the settlements by the relationships between SPT N and maximum volumetric strain after liquefaction are presented in the paper. The proposed methodology is used to estimate the settlements at 13 liquefaction sites. The estimated values of the settlements obtained from these examples can compare favorably with settlements or damage observed at these sites. The estimated settlements given by the procedure may be used as an index to measure liquefaction degree at the site, and then the decision carl be made whether or not to adopt anti-liquefaction measure.

关 键 词：沉降 体积应变 液化 

分 类 号：P315.9[天文地球—地震学]