基于FLAC3 D的太原车站基坑变形影响因素研究.pdf

2016年7月上 施工技术 第45卷第13期 CONSTRUCTION TECHNOLOGY 93 D0I:10.7672/5js2016130093 基于FLAC3D的太原车站基坑变形影响因素研究* 于洋，牛少卿1，杨双锁12，王永鹏 (1.太原理工大学矿业工程学院，山西太原030024：2.重庆大学煤矿灾害动力学与 控制国家重点实验室，重庆400030) [摘要]针对太原地铁首开工段明挖基坑所存在的地质条件复杂、漫滩特征显著、开挖面积大、施工工况复杂等问 题，采用FLAC3数值模拟的方法对车站开挖全过程进行仿真，研究了该种河漫滩地质条件下不同支护参数（插人 比、钢支撑间距、预应力设置值)对太原漫滩地区明挖基坑的影响规律：墙后地表变形表现为明显的凹槽形，整体沉 降量偏小；基坑变形随着插入比的增加而减少，但其减小速率逐渐变缓：基坑变形随钢管撑间距的增大呈近线性增 大的趋势；预应力的提高对减小基坑变形影响甚微. [关键词]地铁：深基坑；支撑：变形；有限元分析 [中图分类号]TU753 [文献标识码]A [文章编号]1002-8498(2016)13-0093-04 Research on Deformation Factors of Foundation Excavation in Taiyuan Subway Station Based on FLAC3D Yu Yang' Niu Shaoqing' Yang Shuangsuo.2 Wang Yongpeng (1.College of Mining Engineering Taiyuan Unirersity of Technology Taiyuan Shanxi 030024 China; 2.State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongging Unirersity Chongging 400030 China) Abstract:In order to solve problems of open-dug foundation excavation in beginning process of Taiyuan subway station with plex geological conditions floodplain and large excavation area and plex construction conditions FLAC3D is used in the whole process of deep foundation excavation.Features of foundation excavation under different supporting parameters such as in floodplain area are found as following:ground surface deformation behind enclosure wall shows concave type with little settlement the deeper the insertion is the smaller and slower the deformation of foundation excavation is.The deformation of foundation excavation tends to be ...