拉林铁路隧道富水冰碛层力学特性研究  

Study on Mechanical Properties of Water-rich Moraine Soil in Lasa-Linzhi Railway Tunnel

作　　者：郑宗溪 王岩[2,3] 刘大刚 胖涛[1] 刘金松 ZHENG Zongxi;WANG Yan;LIU Dagang;PANG Tao;LIU Jinsong(China Railway Eryuan Engineering Group Co.Ltd,Chengdu Sichuan 610031,China;Key Laboratory of Transportation Tunnel Engineering,Ministry of Education,Southwest Jiaotong University,Chengdu Sichuan 610031,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu Sichuan 610031,China)

机构地区：[1]中铁二院工程责任有限公司,四川成都610031 [2]西南交通大学交通隧道工程教育部重点实验室,四川成都610031 [3]西南交通大学土木工程学院,四川成都610031

出　　处：《铁道建筑》2019年第11期63-66,共4页Railway Engineering

基　　金：中国铁路总公司科技研究开发计划（2017G006-B）

摘　　要：对川藏线拉林铁路隧道穿越的富水冰碛层试样进行大型三轴剪切试验,研究相对密实度、含水率对富水冰碛层的影响规律,并分析围压对冰碛层峰值强度的影响。试验结果表明:冰碛层的峰值强度随着相对密实度的增大先缓慢增加后逐渐平稳,黏聚力随相对密实度的增大先减小后增大;冰碛层的峰值强度随着含水率的增大先增大后减小,黏聚力随着含水率的增加先缓慢增加后急剧减小,内摩擦角随着含水率的增加先缓慢增加后减小;相对密实度较大时围压对峰值强度的影响不再明显,不同含水率时围压对于峰值强度的增长率影响较小。A large-scale triaxial shear test was carried out on the samples of the water-rich moraine layer in Lasa-Linzhi railway tunnel of Sichuan-Tibet railway. The influences of relative density and water content on the water-rich moraine layer were studied. The effect of confining pressure on the peak strength of the moraine layer was also analyzed. The experimental test results show that the peak strength of the moraine gradually increases with the increase of relative density,and then gradually stabilizes. The cohesion decreases first and then increases with the increase of relative density.The peak strength of the moraine increases first and then decreases with the increase of water content,and the cohesion increases slowly and then decreases sharply with the increase of water content,and the internal friction angle increases slowly and then decreases with the increase of water content.When the relative density is large,the influence of confining pressure on the peak strength is no longer significant. In the case of different water content,the confining pressure has less influence on the growth rate of the peak strength.

关 键 词：铁路隧道 冰碛层 试验研究 抗剪强度 黏聚力 内摩擦角 

分 类 号：U45[建筑科学—桥梁与隧道工程]