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Sciences in Cold and Arid Regions ›› 2017, Vol. 9 ›› Issue (3): 236–242.doi: 10.3724/SP.J.1226.2017.00236

• ARTICLES • 上一篇    

Direct shear tests of coarse-grained fillings from high-speed railway subgrade in cold regions

QingZhi Wang1,2, JianKun Liu1, JianHong Fang2, AnHua Xu2   

  1. 1. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China;
    2. Qinghai Research Institute of Transportation, Xining, Qinghai 810003, China
  • 收稿日期:2016-11-21 修回日期:2016-12-21 发布日期:2018-11-23
  • 通讯作者: Liu JianKun, Ph.D., JianKun Liu, Professor of School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China. Tel: +86-10-51684096; E-mail: jkliu@bjtu.edu.cn E-mail:jkliu@bjtu.edu.cn
  • 基金资助:
    This research is supported by the National Natural Science Foundation of China (No. 51378057).

Direct shear tests of coarse-grained fillings from high-speed railway subgrade in cold regions

QingZhi Wang1,2, JianKun Liu1, JianHong Fang2, AnHua Xu2   

  1. 1. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China;
    2. Qinghai Research Institute of Transportation, Xining, Qinghai 810003, China
  • Received:2016-11-21 Revised:2016-12-21 Published:2018-11-23
  • Contact: Liu JianKun, Ph.D., JianKun Liu, Professor of School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China. Tel: +86-10-51684096; E-mail: jkliu@bjtu.edu.cn E-mail:jkliu@bjtu.edu.cn
  • Supported by:
    This research is supported by the National Natural Science Foundation of China (No. 51378057).

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摘要： In order to study the shear behavior of coarse-grained fillings taken from the subgrade bottom layer of a cold region high-speed railway, large scale direct shear tests were conducted with different normal pressures, water contents and temperatures. The results indicate that the relationship between shear displacement and shear stress changed from strain-softening at lower normal pressures to strain-hardening at higher normal pressures, in both unfrozen and frozen states. This phenomenon was mainly due to the shear dilatation deformation effect. The shear displacement-shear stress curves show similar stages. Besides, the shear stress rapidly increased and there was not an increment in the shear displacement during the initial stage of the shear process in the frozen state. In both the unfrozen or frozen states at the same water contents, the shear strength increased with increasing normal pressure.

关键词: coarse-grained fillings, large scale direct test, shear displacement-shear stress curve, shear strength

Abstract: In order to study the shear behavior of coarse-grained fillings taken from the subgrade bottom layer of a cold region high-speed railway, large scale direct shear tests were conducted with different normal pressures, water contents and temperatures. The results indicate that the relationship between shear displacement and shear stress changed from strain-softening at lower normal pressures to strain-hardening at higher normal pressures, in both unfrozen and frozen states. This phenomenon was mainly due to the shear dilatation deformation effect. The shear displacement-shear stress curves show similar stages. Besides, the shear stress rapidly increased and there was not an increment in the shear displacement during the initial stage of the shear process in the frozen state. In both the unfrozen or frozen states at the same water contents, the shear strength increased with increasing normal pressure.

Key words: coarse-grained fillings, large scale direct test, shear displacement-shear stress curve, shear strength

Bu JQ, Wang TL, 2015. Influences of freeze-thaw and fines content on mechanical properties of coarse-grained soil. Chinese Journal of Geotechnical Engineering, 37(4): 608-614. DOI: 10.11779/CJGE201504005. [DOI:10.11779/CJGE201504005]
Chen XZ, 1994. Research on the strength of the coarse grained soil and the interlocking force. Engineering Mechanics, 11(4): 56-63. (in Chinese)
Guo QG, 1998. Engineering Properties and Application of Coarse-Grained Soils. Zhengzhou: The Yellow River Conservancy Press.
Liu JK, Lv P, Cui YH, et al., 2014. Experimental study on direct shear behavior of frozen soil-concrete interface. Cold Regions Science and Technology, 104-105: 1-6. DOI: 10.1016/j.coldregions.2014.04.007. [DOI:10.1016/j.coldregions.2014.04.007]
Ma W, Wang DY, 2014. Mechanical Properties of Frozen Soils. Beijing: Science Press.
Peng LY, Liu JK, Xiao JH, 2007. Mechanics properties of compacted silt on Beijing-Kowloon Railway. Journal of Beijing Jiaotong University, 31(4): 56-60. (in Chinese) [DOI:10.3969/j.issn.1673-0291.2007.04.014]
Qi JL, Ma W, 2010. State-of-art of research on mechanical properties of frozen soils. Rock and Soil Mechanics, 31(1): 133-143. (in Chinese) [DOI:10.3969/j.issn.1000-7598.2010.01.025]
Wen Z, Yu QH, Ma W, et al., 2013. Direct shear tests for mechanical characteristics of interface between Qinghai-Tibetan silt and fiberglass reinforced plastics. Rock and Soil Mechanics, 34(S2): 45-50. (in Chinese)
Wu ZW, Ma W, Zhang CQ, et al., 1994. Strength characteristics of frozen sandy soil. Journal of Glaciology and Geocryology, 16(1): 15-20. (in Chinese)
Yang Y, Luo Q, Chen Z, 2010. Experimental study on shear strength of graded gravel for passenger dedicated line. Subgrade Engineering, 4: 75-78. (in Chinese)
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