[1]庄 严 任新红 蒋良文 朱 磊 谢 强.新都桥地区季节性冻土抗剪强度的影响试验研究[J].高速铁路技术,2017,8(06):24-28.[doi:10.12098/j.issn.1674-8247.2017.06.006]
　ZHUANG Yan REN Xinhong JIANG Liangwen ZHU Lei XIE Qiang.Experimental Research on the Effect of Shear Strength of Seasonal Frozen Soil in Xinduqiao Area[J].HIGH SPEED RAILWAY TECHNOLOGY,2017,8(06):24-28.[doi:10.12098/j.issn.1674-8247.2017.06.006]
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新都桥地区季节性冻土抗剪强度的影响试验研究()

《高速铁路技术》[ISSN:1674-8247/CN:51-1730/U]

卷:
8卷
期数:
2017年06期
页码:
24-28
栏目:
出版日期:
2017-11-15

文章信息/Info

Title:
Experimental Research on the Effect of Shear Strength of Seasonal Frozen Soil in Xinduqiao Area
文章编号:
1674—8247(2017)06—0024—05
作者:
庄 严1 任新红1 蒋良文2 朱 磊1 谢 强1
1.西南交通大学, 成都 611756; 2.中铁二院工程集团有限责任公司, 成都 610031
Author(s):
ZHUANG Yan1 REN Xinhong1 JIANG Liangwen2 ZHU Lei1 XIE Qiang1
1.Southwest Jiaotong University, Chengdu 611756,China; 2.China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China
关键词:
粒度;  粗粒含量;  坡洪积角砾土;  抗剪强度
Keywords:
Key words:granularity;  coarse grain content;  Slope diluvial breccia soil;  shear strength
分类号:
TU411.7
DOI:
10.12098/j.issn.1674-8247.2017.06.006
文献标志码:
A
摘要:
川藏铁路沿线有大量的季节性粗颗粒冻土,其中以新都桥地区高含水率的坡洪积粗颗粒季节性冻土为典型代表,目前国内外对该类冻土抗剪强度特性的研究较少。文章通过对新都桥地区不同粒径大小、粗粒含量和含水率的角砾土在冻融和非冻融条件下进行直剪试验,讨论抗剪强度参数的变化规律,重点分析了粒度及粗粒含量对抗剪强度的影响。试验结果表明:(1)饱和冻融作用对土体的抗剪强度影响最大,相比天然工况,饱和冻融作用使土体摩擦角降低25%～29%,粘聚力降低6%～30%,天然冻融作用对土体的抗剪强度影响最小。(2)20 mm粒径为该类土体摩擦角的敏感粒径,通过调整粒径20 mm颗粒的含量可改变土体的抗剪强度。
Abstract:
Abstract:There are large numbers of seasonal frozen soil of coarse particle along Sichuan-Tibet railway. Among them, the seasonal frozen soil with high water content in Xinduqiao area is typical. However, fewer researches have been done about the shear strength of slope diluvial soil at home and abroad. The variation law of shear strength parameters is discussed through direct shear tests on breccia soil of different particle size, coarse grain content and water content under freeze-thaw and none freeze-thaw conditions; the effect of particle size and coarse particle content on the shear strength is mainly discussed. The results show that:(1)the effect of saturated freezing and thawing condition on the shear strength of soil is the greatest while the effect of natural freezing and thawing condition is the minimum. The saturated freezing and thawing condition reduces the frictional angle of soil 25%～29% and cohesion is lower 6%～30%.(2)the shear strength of soil can be changed by adjusting the content of 20 mm grain diameter by which the friction angle of soil is sensitive to be determined.

参考文献/References:

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备注/Memo

备注/Memo:
作者简介:庄严(1992-),男,在读硕士研究生。 基金项目:中国铁路总公司科技研究开发计划重大课题(2014G004-A )
更新日期/Last Update: 2017-12-15