Fully recoverable retaining technology of sheet piles anchored by steel pipe piles for excavations and model tests
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摘要: 针对基坑工程中支护构件浪费、环境污染及高碳排放等问题，提出了一种钢管锚锭板桩全回收基坑支护技术并介绍了支护体系构成。实施了钢管锚锭板桩的大型缩尺模型试验，通过摄影测量技术（DIC和DPA）对模型板桩和管桩在开挖过程中的位移进行观测。试验结果表明：管桩的锚拉作用对结构位移具有显著限制，增加单位宽度的管桩数量可有效减小位移，管桩顶部的最大位移与开挖深度呈双曲线关系。模型地基的变形破坏形式与管桩至板桩的间距有关，随间距增加，破坏形态从管桩与板桩同时倾斜，到沿管桩位置滑裂，再到沿与板桩距离开挖深度约1.5倍的地表滑裂。开挖过程中管桩与板桩的桩顶变形基本协调一致。Abstract: In light of the issues such as inefficiency of retaining component utilization, environmental contamination and excessive carbon emissions associated with excavation engineering, a fully recoverable retaining technology of sheet piles anchored by steel pipe piles is proposed for excavations, and the composition of the retaining system is introduced. A large-scale scale model test is conducted, and the displacements of the sheet piles and pipe piles during excavation are quantitatively measured using the photogrammetry such as DIC and DPA. The test results indicate that the anchorage action of the pipe piles imposes a significant constraint on the structural displacement, and the displacement can be effectively mitigated by increasing the number of pipe piles per unit width. The displacement at the top of the pipe pile exhibits a hyperbolic relationship with the excavation depth. The deformation and failure mechanism of the model foundation are associated with the distance between the pipe piles and the sheet piles. As the distance increases, the failure mechanism varies from the concurrent inclination of the pipe piles and sheet piles to the slippage along the pipe piles, and subsequently to the slippage along the surface area extending about 1.5 times the excavation depth from the sheet piles. The deformations at the top of both the pipe piles and the sheet pile remain consistent throughout the excavation process.
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图 1 钢管锚锭板桩全回收基坑支护体系
Figure 1. Fully recoverable retaining system of sheet piles anchored by steel pipe piles for deep excavations
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图 11 管桩与板桩的位移比较
Figure 11. Comparison of displacements between pipe piles and sheet piles
表 1 试验方案
Table 1 Test schemes
试验编号 单管 双管 A1 A2 A3 A4 B1 B2 管桩与板桩间距L/mm 100 300 500 1000 300 500 
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