Liquefaction evaluation of dam foundation soils considering overlying structure

Journal of Rock Mechanics and Geotechnical Engineering

Gang Wang¹  Hanlong Liu¹  Xing Wei² 

[1] School of Civil Engineering, Chongqing University, Chongqing 400044, China;School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China;

关键词: Liquefaction;    Overlying structure;    Dam;    Stone columns;   

DOI  :  10.1016/j.jrmge.2015.02.005

来源: DOAJ

【 摘 要 】

The liquefaction analysis procedure conducted at a dam foundation associated with a layer of liquefiable sand is presented. In this case, the effects of the overlying dam and an embedded diaphragm wall on liquefaction potential of foundation soils are considered. The analysis follows the stress-based approach which compares the earthquake-induced cyclic stresses with the cyclic resistance of the soil, and the cyclic resistance of the sand under complex stress condition is the key issue. Comprehensive laboratory monotonic and cyclic triaxial tests are conducted to evaluate the static characteristics, dynamic characteristics and the cyclic resistance against liquefaction of the foundation soils. The distribution of the factor of safety considering liquefaction is given. It is found that the zones beneath the dam edges and near the upstream of the diaphragm wall are more susceptible to liquefaction than in free field, whereas the zone beneath the center of the dam is less susceptible to liquefaction than in free field. According to the results, the strategies of ground improvement are proposed to mitigate the liquefaction hazards.

【 授权许可】

Unknown