基于MIDAS软件的基坑开挖数值分析  

NUMERICAL SIMULATION OF DEEP FOUNDATION PIT BASED ON MIDAS/GTS SOFTWARE

作　　者：陆仕渊 LU Shiyuan(Nanning Gty Consruction and Manageanent Coridor Constnction lnvestment Co,Ld.Nanning 530219,China)

机构地区：[1]南宁城建管廊建设投资有限公司维护分公司,南宁530219

出　　处：《低温建筑技术》2022年第6期79-82,共4页Low Temperature Architecture Technology

摘　　要：随着城市化进程不断加速,深基坑工程的开挖问题日益凸显。文中结合深基坑工程实例,采用有限元分析软件MIDAS/GTS,建立了深基坑开挖的有限元分析模型并进行计算分析,通过后处理功能提取地下连续墙围护结构的变形参数数据,对地下连续墙的水平位移和坑顶沉降进行分析。结果表明地下连续墙的最大水平位移随着基坑开挖深度加深逐渐增加,且最大水平位移对应的深度也随之下降。同时,最大水平位移对应的位置均出现在基坑较长边的中部以及大转角处,而地下连续墙底部与中部出现的水平位移二者相差较大,在基坑开挖过程中需考虑土体卸荷所产生的回弹位移对基坑和地下连续墙的影响。坑顶土体竖向沉降随着开挖深度加深而增大,并随着支撑的设置而有所减缓至稳定。研究结论对于深基坑的开挖设计具有一定的借鉴意义。The problems on deep foundation pit excavation becomes increasingly prominent with the acceleration of urbanization. Taking a deep foundation pit project as the case, the finite element analysis model of deep foundation pit excavation is established and calculated and analyzed by using the finite element analysis software MIDAS/GTS.The deformation parameter data of the diaphragm wall enclosure structure is extracted through the post-processing function, and the horizontal displacement and pit roof settlement of the diaphragm wall are analyzed. The results show that the maximum horizontal displacement of the diaphragm wall increases with the excavation depth, and the depth corresponding to the maximum horizontal displacement also decreases. The positions corresponding to the maximum horizontal displacements all appear in the middle of the long side of the foundation pit and the large corner, while the horizontal displacements at the bottom and middle of the diaphragm wall differ greatly. The influence of the springback displacement caused by soil unloading on the foundation pit and the diaphragm wall should be considered in the process of foundation pit excavation. The vertical settlement of soil increases with the depth of excavation, and slows down to stability with the setting of bracing. The conclusion can be used as reference for the design of deep foundation pit excavation.

关 键 词：地下连续墙 数值模拟与实测 深基坑 变形特征 

分 类 号：TU473.2[建筑科学—结构工程]