Deformation characteristics of excavation supported by prefabricated recyclable structures

Fuming Wang, Lichao Chen, Yanhui Pan, Chengchao Guo, Chao Guo, Lisha Yue, Xuanxuan Chu
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Abstract

With the development of urban underground space, green and efficient excavation supporting structures are receiving increasing attention. Thus, prefabricated recyclable supporting structures (PRSSs) have been developed. A deep circular excavation supported by PRSSs in low plasticity clay (CL) was extensively instrumented to explore its deformation characteristics. The measurement results show that the lateral displacement of supporting piles (δhp) presented a typical cumulative pattern dominated by deep inward movement. The maximum lateral displacements of supporting piles (δhpm) varied between 0.28%H∼0.52%H (H is the excavation depth). The maximum lateral pile displacements mostly occurred above the excavation surface, ranging from H+0.5 to H−7.0. The soils 3 and 10 m from the excavation had the largest lateral displacement at the top and a cantilever shape. The ground surface settlements tended to follow a convex pattern. The maximum ground surface settlements (δvm) were normalized using final excavation depth (He) on the east and south sides, i.e., 0.43% and 0.50%, respectively. The ratio of δvm to δhpm tends to increase as the excavation and dewatering proceeds and varies between 0.49 to 1.15. The ground surface settlement due to dewatering was 19% of the maximum settlement.
用预制可回收结构支撑挖掘的变形特征
随着城市地下空间的发展,绿色、高效的挖掘支护结构日益受到重视。因此,预制可循环支护结构(PRSS)应运而生。在低塑性粘土(CL)中,对采用预制可循环支护结构支护的圆形深基坑进行了广泛的仪器测量,以探究其变形特征。测量结果表明,支护桩的横向位移(δhp)呈现出典型的累积模式,以深层向内移动为主。支护桩的最大侧向位移(δhpm)在 0.28%H∼0.52%H(H 为开挖深度)之间变化。最大的桩侧向位移主要发生在开挖面以上,范围从 H+0.5 到 H-7.0。距开挖面 3 米和 10 米处的土壤顶部的横向位移最大,且呈悬臂状。地表沉降呈凸形。东侧和南侧的最大地表沉降(δvm)按最终开挖深度(He)归一化,即分别为 0.43% 和 0.50%。随着开挖和脱水的进行,δvm 与 δhpm 的比值呈上升趋势,在 0.49 至 1.15 之间变化。脱水造成的地表沉降为最大沉降量的 19%。
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