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Alternative TitleExperimental study on the effect of nano-silicon on frozen clay sand strength
胡凯1,2,3; 陈晓清1
Corresponding Author陈晓清
Source Publication冰川冻土
Other Abstract

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sigma_3 = 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。


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 nanosilicon 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 strainsoftening. 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.

Keyword冻土 纳米硅 强度 应力-应变曲线 初始切线模量
Subject AreaTu41
Indexed ByCSCD ; 北大中文核心
Funding Organization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”
Citation statistics
Cited Times:1[CSCD]   [CSCD Record]
Document Type期刊论文
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
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.
APA 胡凯,&陈晓清.(2017).纳米硅对冻结黏性砂土强度影响试验研究.冰川冻土,39(3),602-608.
MLA 胡凯,et al."纳米硅对冻结黏性砂土强度影响试验研究".冰川冻土 39.3(2017):602-608.
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