碎石桩抗地基液化方案的对比分析  

COMPARATIVE ANALYSIS OF THE LIQUEFACTION PERFORMANCE OF THE GRAVEL PILE FOUNDATIONS WITH DIFFERENT SCHEMES

作　　者：孙大圣[1] 杨润林[1] 唐曹明[2] 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083 [2]中国建筑科学研究院抗震所,北京100013

出　　处：《工业建筑》2016年第8期115-118,共4页Industrial Construction

基　　金：国家技术科技支撑计划(2015BAK14B02-4)

摘　　要：地基的液化对地基的抗震性能影响很大。通过有限元方法,对碎石桩加固前后的地基分别从土体有效应力和超静孔隙水压力角度进行对比分析,探讨在不同地震方向增补碎石桩对地基抗液化性能的影响。结果显示:对于易液化的地基,采用碎石桩加固后,地基的超静孔隙水压力大幅度减小,孔隙水压力消散加快,抑制地基液化的效果明显。此外,碎石桩的间距和单位有效置换面积是影响地基抗液化效果的主要因素。The liquefaction of foundation has a great influence on the seismic performance of a foundation. The finite element method was employed to analyze the excess pore water pressure and the effective stress of the soil before and after reinforcement. Meanwhile, the liquefaction performance of the foundation was discussed through adding the gravel piles along the different direction. The results showed that the gravel piles could reduce greatly the excess pore water pressure of a liquefied ground. The dissipation of the pore water pressure was speeded up, and suppression of the liquefaction level of the foundation was obvious. In addition, the distance and the unit replacing area of the gravel piles were two main factors that influence the liquefaction performance of the ground.

关 键 词：地基 液化 地震 碎石桩 抗震性能 

分 类 号：TU435[建筑科学—岩土工程] TU473.1[建筑科学—土工工程]