采用FLAC3D的互层土基坑突涌破坏判断方法  

Study on Judgment Method of Surge Damage of Interbedded Soil Foundation Pit Based on FLAC3D

作　　者：熊宗海 李腾龙 范卫琴 袁光明[1] 蔡兵华 XIONG Zong-hai;LI Teng-long;FAN Wei-qin;YUAN Guang-ming;CAI Bing-hua(Wuhan Fengda Geological Engineering Ltd,Wuhan 430074,China;College of Civil Engineering,Sanming University,Sanming 430074,China;Wuhan Municipal Engineering Group Co.,Ltd.Lunnel Engineering Company,Wuhan 430074,China)

机构地区：[1]武汉丰达地质工程有限公司,湖北武汉430074 [2]三明学院建筑工程学院,福建三明365004 [3]武汉市市政集团隧道工程公司,湖北武汉430074

出　　处：《三明学院学报》2020年第2期64-70,共7页Journal of Sanming University

基　　金：武汉市市政建设集团有限公司科研项目(wszky201820);福建省中青年教育科研项目(JAT170538)。

摘　　要：运用数值模拟方法,模拟了互层土基坑中坑底突涌的发展过程:在开挖互层土层上覆粘土层时,基坑整体处于稳定状态,仅顶部部分区域出现塑性屈服,达到突涌不稳定状态;在开挖互层土层时,土体的塑性区域不断向下方发展,最终以一定角度与下方砂层塑性区贯通,基坑发生突涌。认为数值模拟应以塑性区贯通作为突涌发生的判定标志。Using numerical simulation method, the development process of pit bottom gushing in inter-bedded soil foundation pit is simulated: when excavating the overlying clay layer of interbedded soil, the whole foundation pit is in a stable state, and only the top part of the pit yields plastic ally, thus reaching the unstable state of gushing;when excavating the interbedded soil layer, the plastic zone of soil continues to develop downward, and eventually penetrates the plastic zone of the sand layer below at a certain angle, and the foundation pit gushing occurs. It is considered that the penetration of plastic zone should be taken as the criterion of gushing occurrence in numerical simulation.

关 键 词：互层土 突涌破坏 屈服准则 数值模拟 

分 类 号：TU470[建筑科学—结构工程]