套管排水桩处理可液化地基的数值分析  

Numerical Study on Anti-liquefaction Characteristics of Drainage Casing Pile

作　　者：吴海清[1,2] 陈育民[1,2] 

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室 [2]河海大学土木与交通学院,南京210098

出　　处：《防灾减灾工程学报》2013年第S1期117-122,共6页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然科学基金项目(51379067);江苏省"青蓝工程"优秀青年骨干教师项目(2012);河海大学优秀创新人才支持计划项目(2012)资助

摘　　要：新型套管排水桩技术的原理是将排水盲沟与桩结合起来,排水盲沟提供了桩周的排水通道,在地震发生时,可以有效降低桩周土体产生的超孔隙水压力,达到抗液化的目的。开展了套管桩与不设置排水盲沟的普通桩的静动力数值模拟,结果表明:套管桩的复合地基承载力与等直径普通桩的承载力接近,排水盲沟的设置没有减弱桩的承载能力,在地震作用下,套管桩的排水盲沟可以有效降低桩周产生的超孔隙水压力,提高桩周土体的有效应力,达到地基抗液化的目的。A novel technology of drainage casing pile is introduced.Its principle lies in the combination of the pile and the blind ditch drainage which provides drainage passages around piles.Anti-liquefaction effect is accomplished through efficiently reduce the excess pore water pressure accumulated in soils around piles when the earthquake occurs.The comparison of static-dynamic numerical simulation between drainage casing pile and the routine piles without blind ditch drainage is carried out.The numerical results show that the bearing capacity of drainage casing piles is close to that of conventional piles of equal diameter,which indicates that the pile bearing capacity doesn't decrease as a result of the installation of blind ditch drainage.Conversely,the blind ditch drainage significantly reduces the excess pore water pressure induced by seismic liquefaction,and as a result of which,the effective vertical stress in pile peripheral soils is increased.Thus liquefaction is effectively prohibited.

关 键 词：套管排水桩 抗液化 超孔隙水压力 数值模拟 FLAC3D 

分 类 号：TU473.1[建筑科学—结构工程]