Preliminary study of unloading calculation method in the unloading collapse process of loess between piles

JIN Xin; WANG Tie-hang; HAO Yan-zhou; ZHAO Zai-kun; ZHANG Liang; ZHANG Meng

doi:10.16285/j.rsm.2021.1904

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Preliminary study of unloading calculation method in the unloading collapse process of loess between piles

更新时间：2026-06-25

- Preliminary study of unloading calculation method in the unloading collapse process of loess between piles
- Vol. 43, Issue 9, Pages: 2399-2409(2022)
- 作者机构：
  
  1. 西安工业大学建筑工程学院,陕西,西安,710021
  2. 西安建筑科技大学土木工程学院,陕西,西安,710055
  3. 河南城建学院土木与交通工程学院,河南,平顶山,467036
- 作者简介：
- 基金信息：
- DOI：10.16285/j.rsm.2021.1904
  CLC： TU444
- Online First：12 September 2022，
  
  Published：2022
- 稿件说明：
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JIN Xin, WANG Tie-hang, HAO Yan-zhou, et al. Preliminary study of unloading calculation method in the unloading collapse process of loess between piles[J]. 2022, 43(9): 2399-2409.
DOI：

JIN Xin, WANG Tie-hang, HAO Yan-zhou, et al. Preliminary study of unloading calculation method in the unloading collapse process of loess between piles[J]. 2022, 43(9): 2399-2409. DOI： 10.16285/j.rsm.2021.1904.

摘要

为确定桩间黄土卸荷湿陷过程中卸荷量的合理取值，开展桩−土界面大型剪切试验，研究桩间黄土卸荷湿陷状态下桩−土界面剪切强度、剪切位移及桩−土界面法向力之间的相关关系。结果表明：在桩间土中性点深度范围内，不同竖向应力和含水率状态下的桩−土界面剪切强度可代表桩侧负摩阻力。利用卸荷量与桩侧负摩阻力互为作用力与反作用力的力学原理，并在分析卸荷量随湿陷深度和湿陷进程变化规律的基础上，提出黄土卸荷湿陷过程中卸荷量计算方法，通过对比卸荷量计算值与不同黄土地区桩侧负摩阻力现场实测值，以验证其合理性。该方法不仅为科学评价黄土卸荷湿陷特性提供卸荷作用量化手段，还为相关黄土工程的优化设计提供理论参考依据。

Abstract

To investigate the proper value of unloading in the unloading collapse process of loess between piles

a correlation between pile-soil interface shear strength

shear displacement

and pile-soil interface normal force under collapse was studied by interface shear test. In the range of neutral points

the results indicate that the shear strength of the pile-soil interface under different vertical stresses and water contents can represent the pile side negative friction resistance. Using the mechanical principle of the mutual action and reaction force between the unloading amount and the negative frictional resistance

we proposed a method to calculate the unloading amount based on the unloading variation laws during loess collapse. The rationality of proposed method is verified via the comparison between the calculated unloading values and the field measured results of pile side negative friction resistance in different loess areas. This method provides a quantitative means of unloading effect to promote loess unloading collapse evaluation and optimize the relevant loess engineering design theory.

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