非饱和土热-水-力全耦合本构模型及其验证

doi:10.11779/CJGE202103018

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摘要在地热资源开发与利用、核废料地质处理、垃圾填埋场等诸多岩土工程领域都需要考虑温度对非饱和土性质的影响。为了更为全面描述非饱和土在热-水-力耦合条件下的变形及持水特性,以平均土骨架应力、修正吸力和温度为应力变量,以比体积和饱和度为应变变量,建立了一个非饱和土热-水-力全耦合本构模型。模型通过屈服面方程及屈服面之间的耦合规律来反映热-水-力之间的相互影响,主要包含温度和饱和度对力学特性的影响,吸力和超固结比（应力历史）对热变形的影响,密度、温度和滞回效应对持水特性的影响,温度、应力和滞回效应对干化及湿化变形的影响。利用建立的模型,对不同应力路径下的试验进行预测。通过预测与试验结果的对比,验证了模型的适用性。

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	刘祎
	蔡国庆
	李舰
	赵成刚

关键词 ：非饱和土, 本构模型, 热-水-力耦合, 温度, 吸力

Abstract：For many geotechnical problems, such as development and utilization of geothermal resources, nuclear waste disposal and refuse landfills, we need to consider the effects of temperature on the properties of unsaturated soils. In order to describe the volume change and water retention behavior of unsaturated soils under thermo-hydro-mechanical coupling conditions more comprehensively, a fully coupled thermo-hydro-mechanical constitutive model for unsaturated soils is proposed. In the proposed model, the average soil skeleton stress, modified suction and temperature are taken as stress variables, while the specific volume and degree of saturation are taken as strain variables. The thermo-hydro-mechanical interactions are reflected through the yield surface equations and the coupling laws between yield surfaces by the model. The thermo-hydro-mechanical interactions mainly include the influences of temperature and saturation on mechanical behavior, the influences of suction and overconsolidation ratio (stress history) on thermal deformation, the influences of density, temperature and hysteresis effect on water retention behavior, and the influences of temperature, stress and hysteresis effect on deformation during drying/wetting process. The predictions are performed on the test results under different stress paths using the proposed model. The applicability of the model is verified by the comparisons between predicted and experimental results.

Key words： unsaturated soil constitutive model thermo-hydro-mechanical coupling temperature suction

收稿日期: 2020-04-01

ZTFLH:

TU411

基金资助:国家自然科学基金项目（52078031,51722802,51678041）; 北京市自然科学基金面上项目（8202038）; 中央高校基本科研业务费项目（2020CZ002）

通讯作者: *（E-mail: guoqing.cai@bjtu.edu.cn）

作者简介: 刘祎(1995- ),女,博士研究生,主要从事非饱和土力学等方面的研究工作。E-mail: gqcai1001@163.com。

引用本文:

刘祎, 蔡国庆, 李舰, 赵成刚. 非饱和土热-水-力全耦合本构模型及其验证[J]. 岩土工程学报, 2021, 43(3): 547-555. LIU Yi, CAI Guo-qing, LI Jian, ZHAO Cheng-gang. A fully coupled thermo-hydro-mechanical constitutive model for unsaturated soils and its verification. Chinese J. Geot. Eng., 2021, 43(3): 547-555.

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http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/10.11779/CJGE202103018 或 http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/Y2021/V43/I3/547

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