新都桥地区季节性粗颗粒冻土抗剪强度特性研究
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- 英文论文题名：Study on Shear Strength Characteristics of Coarse Grained Seasonal Frozen Soil in Xinduqiao Area
- 论文作者：朱磊 ; 谢强 ; 王子江 ; 王栋 ; 赵文
- 英文论文作者：Zhu Lei ; Xie Qiang ; Wang Zijiang ; Wang Dong ; Zhao Wen ; Southwest Jiaotong University ; China Railway Eryuan Engineering Group CO.Ltd
- 年：2016
- 作者机构：西南交通大学;中铁二院工程集团有限责任公司;
- 论文关键词：冻融 ; 粗颗粒冻土 ; 抗剪强度
- 英文论文关键词：freezing and thawing ; coarse grained frozen soil ; shear strength
- 会议召开时间：2016-10-14
- 会议录名称：“川藏铁路建设的挑战与对策”2016学术交流会论文集
- 语种：中文
- 分类号：U212.22
- 学会代码：ZGTD
- 会议名称：“川藏铁路建设的挑战与对策”2016学术交流会
- 会议地点：中国四川成都
- 主办单位：中国铁道学会、中国铁道学会工程分会、中国中铁股份有限公司、中铁二院工程集团有限责任公司
- 学会名称：中国铁道学会
- 页数：7
- 文件大小：698k
- 原文格式：O
- 会议级别：全国
摘要
本文通过对拟建川藏铁路新都桥地区的季节性粗颗粒冻土进行了大量的室内直剪试验,重点研究了粗颗粒土在不同级配、不同含水率及不同冻融条件下的力学特性,在此基础上,分析总结了粗颗粒土抗剪强度指标在不同工况下的变化规律。试验结果表明:随着粗颗粒含量的增加,土体的抗剪强度参数增强;同一粒度下的土体,相比天然状态,饱和土体内摩擦角大约减小15%,天然冻融土体内摩擦角减小5%~10%,饱和冻融工况下,土体内摩擦角大约减小25%。试验结果对类似冻土区段的工程力学特性参数选取具有重要的指导意义。
A lot of laboratory direct shear tests were conducted on coarse grained seasonal frozen soil in this paper,the tests mainly researched on the mechanics characteristics of coarse grained soil under circumstances of different gradation,different water content and different freeze-thaw conditions.After summarizing the regularity of shear strength index of coarse grained soil under different working conditions on the basis of the test results,it shows that the shear strength parameters improve with the increase of coarse grain content;compared with the soil of some grain size under natural state,internal friction angle of saturated soil decreases by 15%~25%,internal friction angle of natural freezing and thawing soil decreases by 15%~25%,while under saturated freeze-thaw condition,the internal friction angle of soil has 35%~40%reduction.Test results have vital guiding significance in selecting engineering mechanical parameters for similar frozen soil region.
A lot of laboratory direct shear tests were conducted on coarse grained seasonal frozen soil in this paper,the tests mainly researched on the mechanics characteristics of coarse grained soil under circumstances of different gradation,different water content and different freeze-thaw conditions.After summarizing the regularity of shear strength index of coarse grained soil under different working conditions on the basis of the test results,it shows that the shear strength parameters improve with the increase of coarse grain content;compared with the soil of some grain size under natural state,internal friction angle of saturated soil decreases by 15%~25%,internal friction angle of natural freezing and thawing soil decreases by 15%~25%,while under saturated freeze-thaw condition,the internal friction angle of soil has 35%~40%reduction.Test results have vital guiding significance in selecting engineering mechanical parameters for similar frozen soil region.
引文
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[2]李振,李鹏.粗粒土直接剪切试验抗剪强度指标变化规律[J].防渗技术,2002,8(1):15-20.Li Zhen,Lipeng.Regularity of direct shear strength index of coarse grained soil[J].Seepage Control,2002,8(1):15-20.
[3]薛亚东,岳磊,李硕标.含水率对土石混合体力学特性影响的试验研究[J].工程地质学报,2015,1:005.Xue Yadong,Yue Lei,Li Shuobiao.Research on the mechanics characteristics of stone-soil mixture under circumstances of different water content[J].Journal of Engineering Geology,2015,1:005.
[4]卜建清,王天亮.冻融及细粒含量对粗粒土力学性质影响的试验研究[J].岩土工程学报,2015(4).Pu Zhanqing,Wang Tianliang.Research on the mechanics characteristics of coarse grain content and freezing and thawing condition[J].Journal of Geotechnical Engineering,2015(4).
[5]吴紫汪,马巍.冻结砂土的强度特性[J].冰川冻土,1994,16(1):15-20.Wu Ziwang,Ma Wei.Intensive property of frozen sandy soil[J].Journal of Glaciology and Geocryology,1994,16(1):15-20.