桩锚支护深基坑施工过程变形特征分析

Stability Research of Deep Excavations Supported by Composite Soil Nailing and Pile-anchor

摘要:

以济南市某大型深基坑工程为依托，通过FLAC3D对深基坑工程不同施工阶段的变形特性进行了数值计算分析；桩锚支护深基坑，地表最大竖向变行产生在距离基坑边缘10m位置处，且最大竖向变形量为46.16mm；最大水平位移发生在桩顶冠梁位置处，最大水平位移为53.45mm，是基坑支护最薄弱环节，基坑呈现三角形状向内侧滑动的趋势。

Abstract:

FLAC3D was used to analyze its deformation characteristics and mechanical characteristics during different construction stages. On the condition of the original design schemes, the maximum vertical surface deformation of the pit did not occur in the pit edge, but 10m position from the pit edge, and the maximum vertical deformation was 46.16mm; The maximum horizontal displacement occurred in the top position of the pile, the maximum horizontal displacement was 53.45mm, which was the weakest link in excavation. The sliding trend of foundation presents a triangular shape, which was consistent with the deformed shape of cantilever supporting structure.