Analytical Method for Prediction of Progressive Deformation Mechanism of Existing Piles Due to Excavation Beneath a Pile-Supported Building
Analytical Method for Prediction of Progressive Deformation Mechanism of Existing Piles Due to Excavation Beneath a Pile-Supported Building
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DOI：
10.1007/s40999-018-0309-9
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发表时间：
2019-06
影响因子：
1.7
通讯作者：
Qian-qing Zhang;Shan-wei Liu;Ruo-feng Feng;Xiao-mi Li
中科院分区：
文献类型：
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作者：
Qian-qing Zhang;Shan-wei Liu;Ruo-feng Feng;Xiao-mi Li
在桩支撑建筑物的现有地下室下进行开挖后，桩响应的预测是岩土工程中的一个有趣的话题。本文提出了一种新的载荷传递函数来捕获单位表面摩擦力与轴位移之间的关系。对于开挖前后群桩中单桩的荷载传递函数，考虑桩间相互作用效应，提出了皮摩擦力和端阻力的荷载传递函数。为了快速估计开挖前后桩的响应，使用所提出的载荷传递函数提出了一种新的高效迭代计算机程序。将测量结果、当前计算结果和其他方法的计算值进行比较，以检验所提出方法的可靠性。此外，还进行了参数研究，以评估开挖应力消除桩的表面摩擦力和端部阻力的极限值，并评估了与所提出的荷载传递模型相关的参数对桩响应的影响。
After excavation beneath existing basement of a pile-supported building, prediction of the pile response is an interesting topic in geotechnical engineering. This paper presents a new load transfer function to capture the relationship between unit skin friction and shaft displacement. As to the load transfer function of an individual pile in pile groups before and after excavation, load transfer functions of skin friction and end resistance are proposed considering interactive effects among piles. To get a quick estimation on the pile response before and after excavation, a new highly effective iterative computer program is proposed using the proposed load transfer functions. Comparisons of the measured results, the present computed results and the calculated values derived from other approaches are made to check the reliability of the proposed method. Furthermore, a parameter study is carried out to evaluate the ultimate value of skin friction and end resistance of the pile subjected to stress relief due to excavation, and the influence of the parameters related to the proposed load transfer models on the pile response is also evaluated.