考虑封闭气相影响的非饱和黄土变形和强度行为

doi:10.13722/j.cnki.jrme.2024.0247

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摘要黄土在荷载或增湿作用下其强度和变形易发生显著变化。针对水–力作用下饱和度的宽幅变化而引发的土体响应，充分考虑非饱和黄土中多相耦合的特性，采用广义有效应力及修正吸力为应力变量，建立一个考虑整个可能的吸力和应力范围的弹塑性模型。该模型将高饱和度导致气相封闭的情况统一至广义有效应力框架，引入封闭气相对土体影响的损伤参数，统一描述饱和度宽幅变化下非饱和黄土的变形和强度行为，并通过相应应力和水力路径试验验证模型的合理性和可靠性。模型预测和试验结果对比分析表明，所提模型可以较好地反映考虑封闭气相影响的非饱和黄土的荷载效应。所提模型不仅能够反映固–液相的耦合硬化，还能描述不同水–力作用下封闭气相对变形和强度的影响。

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	秦彪1
	李喜安1
	王力2
	柴昊1

关键词 ：土力学, 非饱和黄土, 封闭气, 广义有效应力, 荷载效应, 本构模型

Abstract：Loess is susceptible to significant changes in strength and volumetric strain under loading or wetting. In this study，to address the soil response induced by wide variations of saturation under hydro-mechanical action，an elastoplastic model considering the entire possible range of suction and stresses is developed by focusing on the case of multi-phase coupling in unsaturated loess，using the generalized effective stress and modified suction as the stress variables. This model unifies the situation of gas phase closure caused by high saturation into the generalized effective stress framework，introduces the damage parameter for the influence of closed gas on soil，and uniformly describes the deformation and strength of unsaturated loess under wide variations of saturation. The reasonableness and reliability of the model have been verified through the corresponding stress and hydraulic path tests. The results show that the proposed model can better reflect the loading effect of unsaturated loess influenced by the closed gas. It adeptly reflects not only the coupled hardening of the solid-liquid phase but also accurately portrays the influence of closed gas on deformation and strength under different hydro-mechanical actions.

Key words： soil mechanics unsaturated loess closed gas generalized effective stress loading effect constitutive model

引用本文:

秦彪1，李喜安1，王力2，柴昊1. 考虑封闭气相影响的非饱和黄土变形和强度行为[J]. 岩石力学与工程学报, 2024, 43(11): 2846-2857.
QIN Biao1，LI Xi?an1，WANG Li2，CHAI Hao1. Deformation and strength behaviors of unsaturated loess considering the influence of closed gas phase. , 2024, 43(11): 2846-2857.

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https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2024.0247 或 https://rockmech.whrsm.ac.cn/CN/Y2024/V43/I11/2846

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