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冻结改良黄土三轴强度和变形特性试验研究

牛亚强, 王旭, 廖孟柯, 蒋代军, 刘德仁

牛亚强, 王旭, 廖孟柯, 蒋代军, 刘德仁. 冻结改良黄土三轴强度和变形特性试验研究[J]. 岩土工程学报, 2016, 38(z2): 198-203. DOI: 10.11779/CJGE2016S2032
引用本文: 牛亚强, 王旭, 廖孟柯, 蒋代军, 刘德仁. 冻结改良黄土三轴强度和变形特性试验研究[J]. 岩土工程学报, 2016, 38(z2): 198-203. DOI: 10.11779/CJGE2016S2032
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NIU Ya-qiang, WANG Xu, LIAO Meng-ke, JIANG Dai-jun, LIU De-ren. Experimental study on triaxial strength and deformation characteristics of frozen-improved loess[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(z2): 198-203. DOI: 10.11779/CJGE2016S2032
Citation: NIU Ya-qiang, WANG Xu, LIAO Meng-ke, JIANG Dai-jun, LIU De-ren. Experimental study on triaxial strength and deformation characteristics of frozen-improved loess[J]. Chinese Journal of Geotechnical Engineering, 2016, 38(z2): 198-203. DOI: 10.11779/CJGE2016S2032
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冻结改良黄土三轴强度和变形特性试验研究  English Version

  • 1. 兰州交通大学土木工程学院,甘肃 兰州 730070;
    2. 甘肃省道路桥梁与地下工程重点试验室 兰州 730070;
    3. 道桥工程灾害防治技术国家地方联合工程实验室,甘肃 兰州 730070;
    4.中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室,甘肃 兰州 730000

基金项目: 国家重点基础研究发展计划（“973”计划）项目（2012CB026102）; 国家自然科学基金重点资助项目（41230630）; 国家自然科学基金项目（51268033）; 中国中铁重点课题（302566）; 长江学者和创新团队发展计划滚动资助（IRT_15R29）”
详细信息
    作者简介:

    牛亚强(1988- ),男,博士研究生,助教,主要从事路基工程、岩土工程等方面的研究。E-mail: niuyq_1377@163.com。

Experimental study on triaxial strength and deformation characteristics of frozen-improved loess

  • 1. School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China;
    2. Key Laboratory of Road & Bridge and Underground Engineering of Gansu Province, Lanzhou 730070, China;
    3. National and Provincial Joint Engineering Laboratory of Road &
    Bridge Disaster Prevention and Control, Lanzhou 730070, China;
    4. State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China

摘要

    摘要
  • 摘要: 通过对-6℃的冻结黄土及冻结改良黄土在1~15 MPa的围压范围内进行一系列的三轴试验,分析其变形和三轴强度特性。研究发现：随着围压的增大,冻土的应力-应变曲线相继体现出应变软化和应变硬化特征,初始切线模量随围压的增大呈现出先增大后减小的趋势;冻结黄土和冻结改良黄土的三轴强度随围压的增大表现出先增大后减小的趋势,改良后冻结黄土的强度得到明显的提高,且水泥比石灰的改良效果更为显著。基于莫尔-库仑强度准则,得到冻结黄土和冻结改良黄土的广义黏聚力和广义内摩擦角随围压的变化规律。同时,建立非线性莫尔-库仑强度准则,用以描述冻结黄土及冻结改良黄土的强度随围压非线性变化的现象。
    Abstract: In order to study the deformation and triaxial strength behaviors of frozen loess and frozen-improved loess, a series of triaxial compression tests are conducted under confining pressure varying from 1 to 15 MPa at -6 °C. The results show that the shape of stress-strain curves presents strain softening and strain hardening successively. Both the initial tangent modulus and the volumetric strain increase at first then decrease with the increase of confining pressure. The triaxial strength of frozen loess and frozen-improved loess increases at first then decreases with the increase of confining pressure. The strength of frozen loess is enhanced after being improved, and the improvement effect of cement is more significant. Based on the Mohr-Coulomb criterion, the variation laws of generalized cohesion and internal friction angle with confining pressures of frozen loess and frozen-improved loess are obtained. Meanwhile, a nonlinear Mohr-Coulomb strength criterion for frozen loess and frozen-improved loess is proposed, which reflects the phenomenon that the triaxial strength changes nonlinearly with the increase of the confining pressure.
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    • 参考文献(16)
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出版历程
  • 收稿日期:  2016-05-18
  • 发布日期:  2016-10-19

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