咬合灌注桩钢支撑联合支护的相邻型基坑稳定性分析

对于形状复杂的地铁基坑的开挖，安全性越来越需要重视。基坑支护变形及稳定性分析尤为重要，要对基坑两侧不同水压力产生的影响进行分析，以防基坑整体围护结构沿一侧移动。运用 FLAC3D数值模拟软件，针对相邻型基坑进行研究分析，基坑支护结构主要为咬合灌注桩及钢支撑支护，其坑与坑之间的支护结构具有透水能力，其他围护结构不透水，一个坑开挖过程中，另一个坑与小坑同时降水。随着开挖深度增加，第一个坑整体支护结构向相邻基坑侧移，通过研究对比分析，得出侧移原因。通过在另一坑一侧的围护结构增加一排钢护结构，来保证相邻型基坑的稳定。

Stability Analysis of Pit Excavation Using Support Combined Adjacent Type Piles with Steel Support

The analysis of deformation and stability of the foundation pit support is very important for the subway founda-tion pit in complex shape .In order to strengthen the supporting structure ,the analysis for the impact of different soil stress on both sides of the foundation pit was performed to prevent the whole envelope of the foundation pit to side shift . Based on the research of numerical simulation of foundation pit ,numerical simulation software & Flac3D was adopted to simulate the excavation and support of foundation pit .Analysis and research about the base-sub foundation pit was carried out ,the retaining structure of foundation pit is mainly engaged in interlocking Cast-in-situ Piles and steel support .The supporting structure between base foundation pit and sub one has the permeability ,other retaining structures are impervi-ous .With the increase of excavation depth ,the first pit supporting structure to the adjacent foundation pit lateral whole , through the comparison analysis research ,it is concluded that reason of lateral displacement ,which can be solved by adding a row of steel structure in another side of the pit enclosure structure and at the same time ensure the stability of the foundation pit adjacent type .