非对称堆载对坑中坑围护结构的影响研究

Study on the Influence of Asymmetric Load on the Retaining Structure of Pit in Pit

为了研究不平衡堆载对坑中坑开挖围护结构的影响,采用了有限元软件PLAXIS模拟不平衡堆载情况下坑中坑开挖的过程。在外坑两侧不平衡堆载情况下,外坑左右侧地连墙和内坑灌注桩的位移都存在较大的差异。同时在不同的外坑超载组合下,外坑左右侧地连墙弯矩最大值发生位置基本相同。内坑左右侧灌注桩的弯矩基本相同,弯矩随超载的增大基本保持不变,并且发生最大弯矩时的位置基本相同。

In order to study the influence of asymmetric load on the retaining structure of pit excavation, the finite element software PLAXIS is used to simulate the process of pit excavation under uasymmetric load. The results show that under the asymmetric load on both sides of the outer pit, there are great differences in the displacement of the ground connecting wall on the left and right sides of the outer pit and the cast-in-place pile in the inner pit. At the same time, under different overload combinations of the outer pit, the location of the maximum bending moment of the ground connecting wall on the left and right sides of the outer pit is basically the same, the bending moment of the cast-in-place pile on the left and right sides of the inner pit is basically the same, the bending moment remains basically unchanged with the increase of overload, and the location of the maximum bending moment is basically the same.