湿干冻融耦合循环作用下膨胀土力学特性及损伤演化规律研究

doi:10.13722/j.cnki.jrme.2018.1470

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摘要针对北疆高寒区膨胀土输水渠道破坏异常严重的问题，开展单向湿干及湿干冻融耦合作用下渠基膨胀土的三轴试验，探讨冻融过程对膨胀土力学特性及损伤演化规律的影响，获得不同循环次数下膨胀土的应力–应变关系、弹性模量、有效抗剪强度指标及其影响因素。结合损伤力学基础理论，引入可评价湿干与冻融过程耦合作用的损伤变量，探讨膨胀土强度和模量的损伤过程。试验结果表明：湿干及湿干冻融耦合循环作用对低围压(?3 = 100 kPa)试样的应力–应变曲线形态产生影响，应力–应变曲线形态差异性随围压的增加逐渐降低；对比不同试验条件下试样的弹性模量和有效抗剪强度指标可知，湿干冻融耦合循环中的冻融过程显著加剧了土体弹性模量和有效黏聚力的衰减，但对有效内摩擦角的影响有限；围压较高状态下试样的损伤以湿干过程作用为主，冻融过程对低围压试验下的损伤效果较明显。

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关键词 ：土力学, 膨胀土, 湿干循环, 湿干冻融耦合, 力学特性, 损伤演化

Abstract：Aiming at the serious damage of water supply canals in expensive soils in the high cold region of northern Xinjiang，the triaxial tests under the unidirectional action of wetting-drying and the cyclic action of coupling wetting-drying and freeze-thaw were performed to investigate the influences of freeze-thaw process on mechanical properties and damage evolution law of expensive soils. The stress-strain behavior，the elastic modulus and the effective shear strength index were obtained under different cycles and the influence factors were discussed. Based on the basic theory of damage mechanics，a damage variable was introduced to evaluate the coupling effect of wetting-drying and freeze-thaw processes，and the strength and modulus damage process were also discussed. The test results show that，under a low confining pressure(?3 = 100 kPa)，the stress-strain behaviors of samples are affected considerably by the cycle numbers and that the morphological difference of different stress-strain curves decreases with increasing the confining pressure. A comparison of the elastic modulus and the effective shear strength index of samples under different test conditions indicates that the freeze-thaw process in the coupling cycle of wetting-drying and freeze-thaw has significant influence on the attenuation of the elastic modulus and the effective cohesion but limited effect on the effective internal friction angle. The damage of soil under a high confining pressure is mainly caused by wetting-drying process，while the damage effect of freeze-thaw process under a low confining pressure is more obvious.

Key words： soil mechanics expensive soil wetting-drying cycle coupling wetting-drying and freeze-thaw mechanical characteristics damage evolution rule

引用本文:

朱洵，蔡正银，黄英豪，张晨，郭万里. 湿干冻融耦合循环作用下膨胀土力学特性及损伤演化规律研究[J]. 岩石力学与工程学报, 2019, 38(6): 1233-1241.
ZHU Xun，CAI Zhengyin，HUANG Yinghao，ZHANG Chen，GUO Wanli. Research on mechanical properties and damage evolution law of expensive soils under the cyclic action of coupling wetting-drying and freeze-thaw. , 2019, 38(6): 1233-1241.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.1470 或 http://www.rockmech.org/CN/Y2019/V38/I6/1233

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