基于ANSYS的深基坑承压水降压对周边环境影响分析

Analysis on Impact of Confined Water Depressurization on Surrounding Environment Based on ANSYS

随着城市地下空间开发朝着深层发展,深基坑工程成为城市建设中的重要课题。当基坑达到一定深度后,不可避免地遇到承压水层的突涌问题。其中悬挂式止水帷幕的基坑,对承压水层的处理通常要求按需降压,既要保证基坑抗突涌稳定,同时也要尽可能保证对坑外承压水层产生较小的影响,特别是对于周边环境复杂、保护等级较高的基坑。利用ANSYS 10.0通用有限元软件中的热分析模块模拟基坑工程中承压水降压的过程,再通过结构模块继承承压水层水头降深结果,将其转换为土层的初始应变,最后经过结构模块的计算分析,得出准确的土体位移结果。为深基坑工程承压水降压设计以及对周边环境影响分析提供了一种新方法。

With the deeper development of urban underground space,the deep foundation pit engineering has become an important task in urban construction.When the foundation pit reaches a certain depth,the inrushing problem of the confined water layer will be inevitably encountered.The foundation pit with the suspended water stop curtain is usually required to depressurize as needed during the treatment of confined water layer,which not only ensure the anti-inrushing stability of foundation pit,but also guarantee little influence on the confined water layer out of pit,especially for the complex surrounding environment and high protection level of the foundation pits.The thermal analysis module in ANSYS 10.0 Universal Finite Element Software is used to simulate the process of confined water depressurization in the foundation pit engineering.Then the result of head drop of confined water layer is inherited by the structure module,which is converted into the initial strain of soil layer.Finally,the accurate soil mass displacement result is achieved through the calculation and analysis of structure module,which provides a new method for the design of confined water depressurization of deep foundation pit and the analysis of the influence on the surrounding environment.