Geomechanics and Engineering

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A novel dual stress/strain-controlled direct simple shear apparatus to study shear strength and shear creep of clay

  • Chen Ge (Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University) ;
  • Zhu Jungao (Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University) ;
  • Wang Tao (School of Earth Sciences and Engineering, Nanjing University) ;
  • Li Jian (Chengdu Engineering Corporation Limited) ;
  • Lou Qixun (Chengdu Engineering Corporation Limited) ;
  • Li Tao (Chengdu Engineering Corporation Limited)
  • Received : 2024.04.01
  • Accepted : 2024.06.04
  • Published : 2024.06.25
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Abstract

Direct simple shear test is an effective method to measure strength and deformation properties of soil. However, existing direct simple shear apparatus have some shortcomings. The paper has developed a novel dual stress/strain-controlled direct simple shear apparatus. The novel apparatus has the following advantages: A rectangular specimen is used that effectively avoid common issues associated with conventional cylindrical specimens, such as specimen tilting. The utilization of deformation control rods ensures a uniform shear deformation of the specimen. Vertically integrated force transmission structure is improved that avoids issues arising from changes in pivot points due to lever tilting. Incorporating this novel direct simple shear apparatus, shear strength and shear creep tests of clay were performed. Shear strength parameters and shear creep behaviors are analyzed. The results of these experiments show that the novel apparatus can measure accurately the shear rheological properties of soil. This study provides strong guidance for studying the mechanical properties of soil in engineering practice.

Keywords

Acknowledgement

This work was supported by the scientific project from Huaneng company Headquarters (HNKJ20-H45), Science and Technology Major Project of Tibetan Autonomous Region of China (XZ202201ZD0003G), Key Support Project of the Yangtze River Water Science Research Joint Fund (U2040221), the Natural Science Foundation of Jiangsu Province (No. BK20230954).

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