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深基坑基底加固对于控制地表沉降,基底隆起,能起到良好的控制作用,依托长沙市地铁3号线某车站工程,采用PLAXIS有限元分析软件建立了数值分析模型,研究了基坑坑底土体加固对基坑变形的影响,并结合现场监测数据验证了PLAXIS在深基坑开挖中的适用性,在此基础上进一步对加固土厚度与基坑变形的规律进行了总结与分析,结果表明坑底加固能有效的控制基坑的稳定,且加固体厚度在4~6m时对于控制地表沉降与基底隆起效果理想.
The foundation reinforcement of deep foundation pit can play a good control role in controlling ground settlement and basement uplift. Based on a station project of Changsha Metro Line 3, a numerical analysis model is established by PLAXIS finite element analysis software, and the foundation pit bottom The influence of soil reinforcement on the deformation of foundation pit and the applicability of PLAXIS in excavation of deep foundation pit are verified by field monitoring data. On this basis, the rules of soil thickness and deformation of foundation pit are further summarized and analyzed, The results show that the pit reinforcement can effectively control the stability of the foundation pit, and the reinforcement thickness of 4 ~ 6m for the control of surface subsidence and basement uplift ideal.