Liquefaction evaluation of dam foundation soils considering overlying structure

作     者：Gang Wang Xing Wei Hanlong Liu 

作者机构：School of Civil Engineering Chongqing University School of Civil Engineering Southwest Jiaotong University 

出 版 物：《Journal of Rock Mechanics and Geotechnical Engineering》 (岩石力学与岩土工程学报（英文版）)

年 卷 期：2015年第7卷第2期

页      面：226-232页

核心收录：

学科分类：08[工学] 0815[工学-水利工程] 081503[工学-水工结构工程] 

基　　金：the support from the National Natural Science Foundation of China (No. 51209179) 

主　　题：Liquefaction Overlying structure Dam Stone columns 

摘      要：The liquefaction analysis procedure conducted at a dam foundation associated with a layer of liquefiablesand is presented. In this case, the effects of the overlying dam and an embedded diaphragm wall onliquefaction potential of foundation soils are considered. The analysis follows the stress-based approachwhich compares the earthquake-induced cyclic stresses with the cyclic resistance of the soil, and thecyclic resistance of the sand under complex stress condition is the key issue. Comprehensive laboratorymonotonic and cyclic triaxial tests are conducted to evaluate the static characteristics, dynamic characteristicsand the cyclic resistance against liquefaction of the foundation soils. The distribution of thefactor of safety considering liquefaction is given. It is found that the zones beneath the dam edges andnear the upstream of the diaphragm wall are more susceptible to liquefaction than in free field, whereasthe zone beneath the center of the dam is less susceptible to liquefaction than in free field. According tothe results, the strategies of ground improvement are proposed to mitigate the liquefaction hazards. 2015 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Production and hosting byElsevier B.V. All rights reserved.