基于桩土接触单元的基坑工程变形监测与数值模拟研究

Study on Deformation Monitoring and Numerical Simulation of Foundation Pit Based on Pile-soil Contact Element

基坑支护方式逐渐趋于多样化,选择正确的支护方式是提高基坑工程的经济性与可靠性的前提条件。排桩内支撑联合土钉支护形式因具有独特的优势而得到了广泛运用。以某基坑工程为例,利用FLAC3D对基坑开挖过程进行模拟,设置桩土接触单元,分析桩-土相互作用,并与监测数据进行对比,其结果体现了排桩联合内支撑和土钉支护方式的合理性,以及桩土接触单元模拟排桩形成的支护结构与周围土体相互作用的有效性。

The supporting mode of foundation pit tends to be diversified gradually. Choosing the right support mode is the prerequisite to improve economy and reliability of foundation engineering projects.The combined supporting structure in the row piles and soil nailing support is widely used because of its unique superiority.This paper takes a foundation pit project in Fuzhou as an example,it uses FLAC3 D to simulate the excavation process of the foundation pit,sets the pile-soil contact elements,considering pile-soil interaction,and compares it with the monitoring data. The results showed the rationality of combined supporting structure in the row pile and soil nailing support,and the effectiveness of pile-soil contact elements in simulating the interaction between supporting structure and surrounding soil.