纳米硅对冻结黏性砂土强度影响试验研究

doi:10.7522/j.issn.1000-0240.2017.0067

冰川冻土 ›› 2017, Vol. 39 ›› Issue (3): 602-608.doi: 10.7522/j.issn.1000-0240.2017.0067

纳米硅对冻结黏性砂土强度影响试验研究

胡凯^1,2,3, 陈晓清¹

1. 中国科学院水利部成都山地灾害与环境研究所山地灾害与地表过程重点实验室, 四川成都 610041;
2. 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;
3. 中国科学院大学, 北京 100049

收稿日期:2017-01-16 修回日期:2017-03-03 出版日期:2017-06-25 发布日期:2017-09-09
通讯作者: 陈晓清,E-mail:xqchen@imde.ac.cn E-mail:xqchen@imde.ac.cn
作者简介:胡凯(1988-),男,江西新余人,2015年在中国科学院旱区环境与工程研究所获硕士学位,现为中国科学院成都山地灾害与环境研究所在读博士研究生,从事冻土力学和寒区工程方面的研究.E-mail:khu_15@163.com
基金资助:
国家国际科技合作专项项目（2012DFA20980）；科技研发项目“堰塞湖风险评估与减灾关键技术研究”资助

Experimental study on the effect of nano-silicon on frozen clay sand strength

HU Kai^1,2,3, CHEN Xiaoqing¹

1. Key Laboratory of Mountain Hazards and Surface Processes, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China;
2. State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
3. University of Chinese Academy of Sciences, Beijing 100049, China

Received:2017-01-16 Revised:2017-03-03 Online:2017-06-25 Published:2017-09-09

摘要/Abstract

摘要： 对加入1%纳米硅的黏性砂土进行温度-2℃、围压0.3~18 MPa的常规三轴压缩试验。试验结果表明：掺入纳米硅的冻结黏性砂土强度明显提高，在σ₃=3 MPa时强度提高甚至达到130%。将强度随围压的变化分成三个阶段：强化阶段，压融阶段，残余阶段。试验应力-应变曲线具有应变软化特性，修正的Duncan-Chang双曲线模型与其吻合良好。通过对修正的Duncan-Chang双曲线模型进行微分，分析得到初始切线模量随围压的变化可分成强化、压融和残余三个阶段。

关键词: 冻土, 纳米硅, 强度, 应力-应变曲线, 初始切线模量

Abstract: A series of triaxial compressive tests on frozen clay sand with 1% nano-silicon were carried out under confining pressure of 0.3~18 MPa at -2℃. The test results show that the strength of frozen soil with nano-silicon has a significant growth, and the proportion of growth even reaches 130% under 3 MPa. The strength changes with increasing confining pressure in three distinct phases:strengthen phase, pressure melting phase and residual phase. The stress-strain curves show strain-softening under various confining pressures. The improved Duncan-Chang hyperbolic model is taken to simulate the stress-strain behaviors and can well describe the strain-softening. Through differentiating the improved Duncan-Chang hyperbolic model, a relation between initial tangent modulus and confining pressure is obtained, which can be divided into three phases:strengthen phase, pressure melting phase and residual phase.

Key words: nano-silicon, frozen soil, strength, stress-strain curves, initial tangent modulus

中图分类号:

P642.14

胡凯, 陈晓清. 纳米硅对冻结黏性砂土强度影响试验研究[J]. 冰川冻土, 2017, 39(3): 602-608.

HU Kai, CHEN Xiaoqing. Experimental study on the effect of nano-silicon on frozen clay sand strength[J]. JOURNAL OF GLACIOLOGY AND GEOCRYOLOGY, 2017, 39(3): 602-608.

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纳米硅对冻结黏性砂土强度影响试验研究

Experimental study on the effect of nano-silicon on frozen clay sand strength

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