刘红,冯永珍,张吾渝,季港澳

• 1:青海大学土木工程学院
• 2:青海省建筑节能材料与工程安全重点实验室

摘要(Abstract)：

为探究主应力轴循环后不同主应力方向角对青海重塑黄土各向异性的影响,对取自青海西宁地区的黄土进行了主应力循环后的定向剪切试验。试验结果表明:主应力方向角对重塑黄土各向异性具有显著影响,不同主应力方向角下重塑黄土的八面体剪应力-应变曲线和偏应力-主应变曲线均表现出很大差异,且不同主应力方向角下土体归一化强度不同;当主应力方向角超过60°时,土样剪切破坏的八面体剪应变变小;土体大主应变曲线的发展趋势与八面体剪应变相似,主应力方向角不超过75°土体中主应变不断向正向发展,主应力方向角为90°时,中主应变有着不同变化趋势,不断向负向发展,土体小主应变的总体变化趋势为负向;重塑黄土归一化强度随主应力方向角增大呈非线性降低,且主应力方向角为90°时土体归一化强度最小。

关键词(KeyWords)： 重塑黄土;应力-应变;大主应力方向角;归一化强度

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(51768060);; 青海大学中青年科研基金项目(2018-QGY-5);; 青海省创新服务平台建设专项(2018-ZJ-T01);; 青海省科技厅项目(2020-ZJ-738)

作者(Author): 刘红,冯永珍,张吾渝,季港澳

DOI: 10.13928/j.cnki.wrahe.2021.03.017

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