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纳米硅对冻结黏性砂土强度影响试验研究
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
2017
Source Publication冰川冻土
ISSN1000-0240
Volume39Issue:3Pages:602-608
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。

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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
Language中文
CSCD IDCSCD:6068560
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
Identifierhttp://ir.imde.ac.cn/handle/131551/20706
Collection山地灾害与地表过程重点实验室
Affiliation1.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
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
3.中国科学院大学
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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