| 引用本文: | 陈敦,马巍,穆彦虎,王大雁,雷乐乐,周志伟,蔡聪.主应力方向和中主应力系数对冻结黏土性状的影响[J].哈尔滨工业大学学报,2018,50(6):97.DOI:10.11918/j.issn.0367-6234.201708111 |
| CHEN Dun,MA Wei,MU Yanhu,WANG Dayan,LEI Lele,ZHOU Zhiwei,CAI Cong.Stress-strain properties of frozen clay with consideration of major principal stress direction and coefficient of intermediate principal stress[J].Journal of Harbin Institute of Technology,2018,50(6):97.DOI:10.11918/j.issn.0367-6234.201708111 |
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| 主应力方向和中主应力系数对冻结黏土性状的影响 |
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陈敦1,2,马巍1,穆彦虎1,王大雁1,雷乐乐1,2,周志伟1,蔡聪1,2
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(1.冻土工程国家重点实验室(中国科学院西北生态环境资源研究院),兰州 730000;2.中国科学院大学,北京 100049)
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| 摘要: |
| 为研究复杂应力路径下冻土的力学特性，利用冻土空心圆柱仪对饱和冻结黏土开展了定向剪切试验，重点研究了大主应力方向和中主应力系数对饱和冻结黏土应力应变性状的影响.试验结果表明：定向剪切路径下饱和冻结黏土应力-应变曲线基本呈现应变硬化特征，且广义剪应力-应变曲线受扭剪分量的主导.不同大主应力方向下冻结黏土应力-应变曲线水平存在一定差异，当中主应力系数b为0.5和1时广义剪应力-应变曲线水平随着大主应力方向角α的增加而降低.中主应力系数b对冻结黏土扭剪分量的应力应变性状影响相对较小，而对轴向分量与广义剪应力应变性状影响显著.
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| 关键词: 饱和冻结黏土 空心圆柱仪 大主应力方向 中主应力系数 应力应变性状 |
| DOI：10.11918/j.issn.0367-6234.201708111 |
| 分类号:TU445 |
| 文献标识码:A |
| 基金项目:国家自然科学基金(7,6,41671069) |
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| Stress-strain properties of frozen clay with consideration of major principal stress direction and coefficient of intermediate principal stress |
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CHEN Dun1,2,MA Wei1,MU Yanhu1,WANG Dayan1,LEI Lele1,2,ZHOU Zhiwei1,CAI Cong1,2
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(1.State Key Laboratory of Frozen Soils Engineering (Northwest Institute of Eco-Environment and Resources, CAS), Lanzhou 730000, China; 2.University of Chinese Academy of Sciences, Beijing 100049, China)
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| Abstract: |
| To study mechanical properties of frozen saturated clay (FSC) under complex stress path, a series of directional shear tests were conducted using dynamic hollow cylinder testing apparatus of frozen soils (FHCA-300). Impacts of major principal stress direction and coefficient of intermediate principal stress on the stress-strain property of FSC were investigated through the directional shear tests. The results indicate that the stress-strain curves of FSC all perform as strain hardening under directional shearing, and the torsional shear component dominates the generalized shear stress-strain curves. Under different major principal stress directions, stress-strain curves of FSC have different levels correspondingly. When the coefficient of intermediate principal stress is 0.5 or 1, the level of generalized shear stress-strain curves will decrease with increase of the direction angle of major principal stress. The coefficient of intermediate principal stress has slight influence on the stress-strain property of torsional shear component, but has great influence on axial component and generalized stress-strain property.
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| Key words: frozen saturated clay dynamic hollow cylinder testing system major principal stress direction coefficient of intermediate principal stress stress-strain property |
