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成都海外交流中心深基坑工程采用带拉锚和桩顶设置圈梁的桩排式支护结构 ,根据该工程护壁桩钢筋应力的实测值及用以求得的桩身弯矩 ,分析了护壁桩的变形状态和坑底以上桩侧的土压力。结果表明 ,圈梁对桩顶有明显的约束作用 ,使桩的变形状态不同于上端自由的直立杆件 ;在支护结构正常工作的情况下 ,坑底以上桩侧土压力的分布和大小都与经典土压力理论有显著差别。
The deep foundation pit project of Chengdu Overseas Exchange Center adopts the pile-type retaining structure with the ring beam and the anchor and the top of the pile. Based on the measured values of the reinforcement stress of the retaining wall pile and the bending moment of the pile body obtained from the pile wall, Pile deformation state and earth pressure above the pit bottom pile. The results show that the ring beam has obvious restraining effect on the pile head, which makes the pile deformation state different from the upright member with upper free end. Under the normal working condition of support structure, the earth pressure distribution and size There is a significant difference with classical theory of earth pressure.