不同开挖方式的深基坑数值模拟研究分析

Research and Analysis of Numerical Simulation for Different Ways of Excavating Deep Foundation Pit

文章采用有限元软件RFPA对济南市某30层高建筑物的深基坑开挖过程进行了数值模拟计算。考虑不同土体的相互作用,模拟深基坑在开挖过程中的变形与破坏现象,通过分析深基坑的隆起量以及地表的沉降量等,得出了一些有实际意义的规律与结论,并最终确定该建筑物的深基坑开挖方案为放坡比为1.0∶1.7作为此工程基坑开挖的方法,同时添加锚杆进行支护,本文数值模拟计算结果对同等地质条件下的深基坑开挖具有重要的指导意义和借鉴参考价值。

In this article,a process of excavating deep foundation pit of a 30-storey building is calculated with numerical simulation by the finite-element software RFPA.Consider the interaction of different soil bodies as well as simulate the distortion and destroy in the process of excavating deep foundation pit,some norms and conclusions with actual significances are got through analyzing the rising of deep foundation pit and subsidence.Finally,the excavation plan for the deep foundation pit of the building is determined to be with ratio of slope of 1.0：1.7 and roofbolt as support.The calculated results in the paper could guide and be as references for excavating deep foundation pit with the same geologic conditions.