计算黄土卸荷湿陷量的模量折减法研究

doi:10.13722/j.cnki.jrme.2020.0783

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摘要黄土卸荷湿陷现象普遍存在于湿陷性黄土场地试坑和桩间土浸水等工况中，探究卸荷湿陷影响下的黄土湿陷量计算方法对于在保证黄土工程稳定安全的前提下，提高设计合理性、节约资金具有重要意义。为实现黄土卸荷湿陷量的快速计算分析，首先根据黄土恒载湿陷试验结果进行反算分析，利用黄土遇水后变形模量降低的特性，建立恒载条件下黄土湿陷系数与模量折减系数的对应关系。进一步对卸荷湿陷试验结果进行反算分析，建立卸荷条件下黄土卸荷湿陷系数与模量折减系数的对应关系。根据湿陷系数与卸荷湿陷系数的相关关系得到计算黄土卸荷湿陷量的模量折减法。然后利用黄土卸荷湿陷系数与模量折减系数在卸荷量为零时可退化至恒载湿陷条件下的对应关系，对模量折减法的合理性进行退化验证。并将其用于桩间黄土湿陷时的桩侧负摩阻力计算以验证可靠性。研究成果为黄土卸荷湿陷变形分析提供了便捷途径，并对湿陷性评价体系进行一定的补足和验证。

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	金鑫1
	王铁行2
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关键词 ：土力学, 黄土湿陷, 卸荷作用, 模量折减, 卸荷湿陷量

Abstract：Loess unloading collapse widely exists in test pits and the loess between piles. On the premise of ensuring the safety of loess engineering，it is important to boost the economy and rationality of engineering projects. To achieve efficient calculation of loess unloading collapse，the inverse analysis of loess collapse tests under constant loads is carried out，and the relationship between the collapse coefficient and the modulus reduction coefficient under constant loads is established according to that the deformation modulus of loess decreases after immersion. Furthermore，the inverse analysis of loess unloading collapse tests is performed，and the relationship between the unloading collapse coefficient and the modulus reduction coefficient is proposed. A modulus reduction method for calculating the loess unloading collapse is obtained with the help of the relationship between the collapse coefficient and the unloading collapse coefficient，and verified through evaluating the relationship between the unloading collapse coefficient and the modulus reduction coefficient by setting the unloading amount equal to zero to simulate the constant loading case. The research results provide an efficient way for analyzing loess unloading collapse and improve the collapse evaluation system.

Key words： soil mechanics loess collapse unloading modulus reduction unloading collapse amount

引用本文:

金鑫1，王铁行2，张玉1，3，张猛1. 计算黄土卸荷湿陷量的模量折减法研究[J]. 岩石力学与工程学报, 2021, 40(7): 1473-1483.
JIN Xin1，WANG Tiehang2，ZHANG Yu1，3，ZHANG Meng1. A modulus reduction method for calculating loess unloading collapse. , 2021, 40(7): 1473-1483.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2020.0783 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/I7/1473

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