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在基坑支护中围护桩被广泛采用,且常与其他形式的加固措施联合使用,因而将围护桩作为悬臂式结构进行计算分析,在一定程度上是不合理的。以合肥某地铁车站深基坑为例,将不同形式的加固措施抽象为力学上的约束条件。采用有限元方法计算分析了不同约束条件下围护桩的受力与变形。计算结果表明,对围护桩顶端施加侧向位移约束可有效减小桩体的侧向变形与所受弯矩,因而应尽可能地施加水平支撑或锚杆。对桩顶端角位移的约束也可有效减小桩体的侧向变形,因此,冠梁的存在是必要的。深基坑的施工中,应采取多种措施增加围护桩的约束,提高其稳定性,从而更好地保证基坑安全。
In the foundation pit support retaining pile is widely used, and often combined with other forms of reinforcement measures, thus the calculation of the cantilever structure as a cantilever structure, to a certain extent, is unreasonable. Taking a deep foundation pit of a subway station in Hefei as an example, different forms of reinforcement measures are abstracted as mechanical constraints. The finite element method is used to calculate and analyze the stress and deformation of retaining pile under different constraints. The calculation results show that the lateral displacement of the top of the retaining pile can effectively reduce the lateral deformation and the bending moment of the pile. Therefore, the horizontal support or bolt should be applied as much as possible. Constraints on the displacement of the top of the pile can also effectively reduce the lateral deformation of the pile body. Therefore, the existence of the crown beam is necessary. In the construction of deep foundation pit, various measures should be taken to increase the restraint of retaining pile and improve its stability so as to ensure the safety of foundation pit better.