重庆国泰广场项目深基坑边坡对轻轨隧道安全性影响研究

摘要

The impact of deep foundation pit slope on adjacent buildings has been a hot and thorn problem in geotechnical engineering. Since various rock-soil analysis methods with ultimate balance theory take no consideration into the change of stress field and displacement field of rock-soil caused by foundation pit excavation, the real situation of deep foundation pit slope project cannot be reflected. Based on a practical case in Chongqing, the changed situation of the stress field, displacement field, inner force and plastic area distribution of the surrounding rock-soil of foundation pit under construction are analyzed with ANSYS and MIDAS/GTS. And compared with adjacent projects, the interactive impact of deep foundation pit slope on adjacent build-ings is evaluated.%深基坑边坡与已建相邻重要建(构)筑物相互影响问题一直都是岩土工程中的一个热点问题和难点问题。由于建立在极限平衡原理基础上的各种岩土体分析方法均没有考虑基坑开挖引起的岩土体应力场和位移场等的变化，所以不能反映深基坑边坡工程的实际情况。该文结合重庆某工程实例，采用国际通用的大型有限元程序ANSYS、MIDAS/GTS分析深基坑边坡开挖过程中基坑周围岩土体的应力场、位移场、内力及塑性区分布等的变化情况，另采用已建相邻工程进行类比分析，来评估深基坑边坡与相邻重要建(构)筑物相互影响程度，以及工程的安全性、可行性。