深基坑锚拉护壁桩的受力特性和土压力

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 桩的变化形状态２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２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。

Behavior and Earth Pressure of the Retaining Piles with Anchors for Deep Excavation

The deep excavation engineering of the Overseas Exchange Center of Chengdu takes a structure of retaining piles that use anchors and have ring beam to join the tops of the piles. In this paper, based on the measured reinforcement stresses in the piles during the foundation pit's excavation, the corresponding moments in the piles are obtained, and the deformation condition of the piles and the earth pressure acting on the piles above the excavation surface are analyzed. Results show that the ring beam has an appreciable restriction effect on the lateral displacement and rotation of the pile tops, and the deformation condition of the piles is completely different from that of upright free-head shafts. Under the normal working condition of the retaining structure, the earth pressure above the excavation surface on the piles is quite different from the classical earth pressure theory in distribution and value,