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Effects of Wet–Dry Cycle on the Shear Strength of a Sandstone–Mudstone Particle Mixture

  • Sheng-Chuan Tang
  • Jun-Jie WangEmail author
  • Zhen-Feng Qiu
  • You-Man Tan
Research Paper

Abstract

Shear strength of a sandstone–mudstone particle mixture, filled along the bank of a large reservoir and subjected to wet–dry cycle induced by the rise–lower cycle of water level, may be affected by the wet–dry cycle. To investigate the effects, two-type triaxial tests, without and with the wet–dry cycle, were carried out. The experimental data indicate that the shear strength, denoted by peak deviator stress (σ1 − σ3)f, angle of shearing resistance φ, nonlinear shear strength indicators φ0 and φd, or linear shear strength indicators φ* and c, is reduced by the wet–dry cycle. With the increment of cycle from 1 to 20, the decrement of shear strength, denoted by the parameters mentioned above, is increasing in a logarithmic relationship. Furthermore, the effect is also related to the confining pressure and stress level selected in the tests. Based on analyzing experimental data, several logarithmic functions, used to predict the shear strength of the mixture after the wet–dry cycle, were suggested. Due to the effect of the wet–dry cycle, stability of a slope, filled in waterfront conditions using the mixture, is reduced.

Keywords

Shear strength Wet–dry cycle Sandstone–mudstone particle mixture Stability of slope Experiment 

Notes

Acknowledgements

The authors gratefully acknowledge financial supports from the National Key R&D Program of China under no. 2018YFC1504903, the National Natural Science Foundation of China under Grant nos. 51479012 and U1865103, and the Chongqing Science and Technology Commission of China under Grant no. cstc2017kjrc-cxcytd30001, respectively.

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Copyright information

© Iran University of Science and Technology 2019

Authors and Affiliations

  • Sheng-Chuan Tang
    • 1
  • Jun-Jie Wang
    • 2
    • 3
    Email author
  • Zhen-Feng Qiu
    • 4
  • You-Man Tan
    • 5
  1. 1.National Engineering Laboratory for Road Engineering and Disaster Prevention and Reduction Technology in Mountainous AreasChina Merchants Chongqing Communications Research and Design Institute Co., Ltd.ChongqingPeople’s Republic of China
  2. 2.Chongqing Engineering Research Center of Diagnosis Technology and Instruments of Hydro-ConstructionChongqing Jiaotong UniversityChongqingPeople’s Republic of China
  3. 3.Chongqing Engineering Research Center of Disaster Prevention and Control for Banks and Structures in Three Gorges Reservoir AreaChongqing Three Gorges UniversityChongqingPeople’s Republic of China
  4. 4.Key Laboratory of Hydraulic and Waterway Engineering of Ministry of EducationChongqing Jiaotong UniversityChongqingPeople’s Republic of China
  5. 5.National Engineering Research Center for Inland Waterway RegulationChongqing Jiaotong UniversityChongqingPeople’s Republic of China

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