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.
作者
熊宗海
李腾龙
范卫琴
袁光明
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)
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)。
关键词
互层土
突涌破坏
屈服准则
数值模拟
interbedded soil
gushing failure
yield criterion
numerical simulation
