深基坑锚拉护壁桩的受力特性和土压力
Behavior and Earth Pressure of the Retaining Piles with Anchors for Deep Excavation
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摘要: 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。Abstract: The deep excavation engineeringof the Overseas Exchange Centerof Chengdu takes a structure of retaining piles that use anchors and have ring beamto 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 mo- ments 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 showthat the ring beam has an appreciable re- striction 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,
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Key words:
- deep excavation /
- earth pressures /
- retaining piles /
- deformation state
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