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冰川冻土  2014 

循环与单调加载作用下冻结黄土的变形与损伤特性

DOI: 10.7522/j.issn.1000-0240.2014.0141, PP. 1184-1191

Keywords: 冻结黄土,加卸载,变形,损伤变量

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Abstract:

针对冻土工程中地基冻土体受力形式复杂、常处于变应力路径、反复加卸载作用问题,开展了冻结黄土静力条件下的三轴加卸载试验与单调加载对比试验,研究了两种应力路径下冻结黄土的变形和损伤特性.通过对比发现,加载方式对冻结黄土变形特性随围压的变化规律影响不大.循环加卸载作用下,冻结黄土的压密变硬增强了其抵抗变形的能力.卸载阶段,冻结黄土表现出卸载体胀的弹性现象,呈现出与融土不同的体变特征.基于弹性模量的劣化定义了冻结黄土的损伤变量,并根据试验结果得出了冻结黄土的损伤演化规律可用双曲线函数来描述.在较低的围压下,围压增加对冻土损伤的发展有抑制作用;而当围压足够大时,由于冰的压碎和压融的出现,围压增大加剧了损伤的发展.

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