基于MIDAS技术的二维深基坑工程模拟研究  

Research on Two Dimensional Deep Foundation Pit Engineering Simulation Based on MIDAS Technology

作　　者：李勇军 黄雨茜 程学磊 李文东 李顺群 LI Yong-jun;HUANG Yu-qian;CHENG Xue-lei;LI Wen-dong;LI Shun-qun(Department of Logistics Management,Liaoning University of Technology,Jinzhou 121001 China;School of Civil Engineering,Tianjin Chengjian University,Tianjin 300384,China;School of Architectural Engineering,Zhongyuan University of Technology,Zhengzhou 450007,China;Yellow River Institute of Hydraulic Research,Zhengzhou 450003,China)

机构地区：[1]辽宁工业大学后勤管理处,辽宁锦州121001 [2]天津城建大学土木工程学院,天津300384 [3]中原工学院建筑工程学院,河南郑州450007 [4]黄河水利委员会黄河水利科学研究院,河南郑州450003

出　　处：《辽宁工业大学学报（自然科学版）》2023年第1期42-46,51,共6页Journal of Liaoning University of Technology(Natural Science Edition)

基　　金：天津市重点研发计划科技支撑重点项目(19YFZCSF00820)。

摘　　要：依托合肥经开区大学城地下空间利用项目,借助MIDAS GTS有限元数值模拟软件,研究二道斜撑在一定开挖步序情况下的开挖效应,对开挖过程中邻近基坑的隧道产生的影响进行了分析。并通过对建模计算结果的分析讨论,提出了一些包括开挖、支护等改进施工简单有效的措施。研究发现,基坑开挖时的围护结构位移变形的最大值发生在基坑的中间部位,而不是在两端;周边建筑物沉降发生在基坑开挖围护结构边缘处,且随着与基坑的距离越远,沉降值越来越小且慢慢趋于稳定;基坑底部土体的纵向隆起边缘部分会小于其中部;盆式开挖方便了斜撑做到“先支撑,再开挖”,减小了因为土体开挖导致的围护桩位移,利用反压土抵挡作用在挡土结构外侧的主动土压力;斜撑相较于水平撑来说,开挖区域广阔,可在盆式开挖阶段采用各类大型开机械进行施工。Based on the underground space utilization project of University Town in Hefei Economic Development Zone,MIDAS GTS finite element numerical simulation software is used to study the excavation effect of two inclined braces in a certain excavation sequence,and the influence of the tunnel adjacent to the foundation pit in the excavation process is analyzed.Through the analysis and discussion of the modeling calculation results,some simple and effective measures to improve the construction including support and excavation are put forward.The results show that the maximum displacement of the retaining structure occurs at the middle part of the foundation pit,not at both ends;The settlement of surrounding buildings occurs at the edge of the retaining structure of foundation pit excavation,and the settlement value becomes smaller and smaller with the increase of the distance from the foundation pit and gradually tends to be stable;The middle part of longitudinal uplift of foundation pit is larger than its edge;Basin excavation facilitates the inclined bracing to“support first,then excavate”,reduces the displacement of the retaining pile caused by soil excavation,and uses the back pressure to resist the active earth pressure on the outside of the retaining structure;Compared with the horizontal support,the excavation area of diagonal support is broad,and various large opening machines can be used for construction in the basin excavation stage.

关 键 词：深基坑 二维 数值模拟 隧道 位移 

分 类 号：TU413.4[建筑科学—岩土工程]