地铁车站深基坑开挖对土体影响的数值模拟

为了研究地铁工程支护结构对周围土体变形影响的问题,应用有限元计算软件ADINA对地铁车站深基坑工程进行开挖支护模拟,建立明挖法深基坑开挖支护过程的三维模型,分析开挖过程中连续墙支护开挖和连续墙、锚杆联合支护开挖两种工况下,基坑周边地层的位移情况.研究结果表明:地铁车站深基坑的开挖与支护过程是一个基坑支护结构和基坑内土体、基坑周围土体共同作用的问题,支护结构和支护方法对基坑周围环境的影响明显,周围土体和基坑内土体对基坑性状的影响显著.

Numerical simulation on effect of soil deformation caused by excavating deep foundation pit of subway station

To study the deformation of surrounding strata at foundation pit,a finite element software ADINA is used to simulate the excavation and support of the deep foundation pit at a subway station.A three-dimensional model of open excavation and support process is constructed to model the process of excavation and support.In addition,under the following conditions: 1) using continuous wall to support excavation;2) using the combination of continuous wall and bolt to support excavation,the movements of strata surrounding the foundation pit are analyzed.The study results show that the foundation pit supporting structure,the soil inside and around the pit are interacted together during the excavation and support process.Supporting structure and excavation method have significant impact on the surrounding environment and also the soil inside and around the pit affects the pit significantly.