基坑支护设计案例的数值模拟

Numerical simulation of supporting scheme for foundation pit

工程中常用灌注型排桩作为基坑的支护结构,常用计算工具为理正深基坑软件。万年复线船闸基坑支护结构不具备常规拉锚条件,采用帽梁做成"L"形拉锚,且基坑开挖底高程有较大变化,其三维特性明显,采用理正深基坑软件计算将不准确。基于ABAQUS软件,模拟结构与土的相互作用,并对计算成果进行分析,对类似工程项目的设计具有借鉴意义。

In the engineering,the bored cast-in-situ soldier-pile is often used as the supporting structure of the foundation pit, and the solution program for a foundation pit called Lizheng is commonly used to design the supporting scheme. The supporting row of piles of the double-locks called Wannian can＇t be anchored as usual.Therefore,the supporting row of piles is restrained by an L-shaped cap-beam. Besides,the elevation of the button of the foundation pit varies greatly,which results in a more obvious spatial characteristic of the foundation pit. All the above indicate that Lizheng may not give an accurate solution to the supporting scheme. This paper simulates the mutual effect of the structure and soil based on software ABAQUS,and analyzes the calculation result,which may serve as reference for the similar engineering design.