饱和盐渍黏土弹塑性行为的试验及理论研究

doi:10.13722/j.cnki.jrme.2023.0115

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摘要为了研究孔隙溶液种类和浓度、超固结程度对饱和黏土应力–应变曲线和剪胀行为等力学性能的影响，开展一系列控制含盐条件和超固结比(OCR)的三轴压缩试验。试验结果指出，孔隙盐溶液的成分和浓度的变化会改变黏土的超固结程度、变形能力、剪胀比和临界状态线斜率，但对弹性模量的影响较小。因此，为了模拟饱和盐渍黏土的弹塑性行为，在UH模型的基础上建立一个新的化学弹塑性模型。该模型考虑渗透吸力对黏土力学特性的影响，可用于刻画不同含盐条件下饱和黏土的应力–应变行为。新模型首先借助等效应力的概念明确渗透吸力的贡献，给出饱和盐渍黏土的化学弹性理论。然后，借助渗透吸力推导饱和盐渍黏土的屈服面、硬化模量、应力–剪胀方程和本构关系。研究发现随着渗透吸力的增加，饱和盐渍黏土的屈服面在三维应力空间中变得愈加“矮胖”，超固结程度逐渐减弱，剪胀比也逐渐增大。此外，通过模型对不同渗透吸力下饱和盐渍黏土试验结果的模拟和对比分析验证模型的普适性和预测能力。

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	周凤玺1
	王立业1
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	万旭升3
	梁玉旺1
	叶伟林2

关键词 ：土力学, 饱和盐渍黏土, 渗透吸力, 三轴压缩试验, 应力&ndash, 剪胀行为, UH模型

Abstract：A series of triaxial compression tests involving saline condition and degree of overconsolidation are carried out to investigate the influence of type and concentration of pore solution and overconsolidation ratio(OCR) on the stress-strain curve，dilatancy behavior and other mechanical properties of saturated clay. The test results indicate that the change of the type and concentration of pore solution can change the degree of overconsolidation，deformation capacity，dilatancy ratio and slope of critical state line of clay，but it has little effect on the elastic modulus. Therefore，a new chemo-elastoplastic model is established based on UH model to simulate mechanical behavior of saturated saline clay. This model considers the impact of osmotic suction on clay?s mechanical properties and can describe its stress-strain behavior under different saline conditions. The new model introduces equivalent stress to define osmotic suction?s contribution and presents a chemical elasticity theory for saturated saline clay. Additionally，the yield surface，hardening modulus，stress-dilatancy equation and constitutive relation of saturated saline clay are derived by considering osmotic suction effects. It is observed that increasing osmotic suction leads to a“shorter and fatter”yield surface in three-dimensional stress space for saturated saline clay while reducing overconsolidation degree but increasing dilatancy ratio gradually. The universality and prediction ability of this model are verified by simulation and comparative analysis of test results of saturated saline clay under different osmotic suction.

Key words： soil mechanics saturated saline clay osmotic suction triaxial compression test stress-dilatancy behavior UH model

引用本文:

周凤玺1，王立业1，2，万旭升3，梁玉旺1，叶伟林2. 饱和盐渍黏土弹塑性行为的试验及理论研究[J]. 岩石力学与工程学报, 2023, 42(12): 3095-3108.
ZHOU Fengxi1，WANG Liye1，2，WAN Xusheng3，LIANG Yuwang1，YE Weilin2. Experimental and theoretical study on elastoplastic behavior of saturated saline clay. , 2023, 42(12): 3095-3108.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2023.0115 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/I12/3095

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