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Study on Creep Characteristics of Water Saturated Phyllite

Author

Listed:
  • Yabin Wu

    (Changsha Institute of Mining Research Co., Ltd., Changsha 410012, China
    State Key Laboratory of Safety Technology of Metal Mine, Changsha 410012, China)

  • Jianhua Hu

    (Zijin School of Geology and Mining, Fuzhou University, Fuzhou 350108, China)

  • Guanping Wen

    (School of Resources and Safety Engineering, Central South University, Changsha 410083, China)

Abstract

Phyllite is affected by its own bedding, stress environment and water-saturated conditions. There are great differences in its deformation and failure in engineering, and its creep characteristics are an important basis for evaluating the long-term stability of phyllite engineering. Therefore, this study carried out creep tests of water-saturated phyllite under different bedding angles and confining pressures, studied the coupling effect of factors that affect the creep characteristics of phyllite, and investigated and analyzed the deformation characteristics of a phyllite roadway support on site to provide basic support for phyllite roadway mine disaster control and collaborative mining research. The results showed the following: (1) When the bedding dip angle was 30~60°, under the control of the bedding, the sliding deformation along the bedding suddenly increased under the low-stress condition and the specimen did not undergo structural damage. It could continuously bear multi-level stress and generated creep deformation. In this case, a phyllite roadway should adopt the support method of combining flexibility and rigidity. (2) In the process of multi-stage stress loading, the creep instantaneous stress was directly proportional to the initial stress. When the stress was loaded to 50% of the failure strength, the instantaneous stress tended to be stable and maintained a linear, slightly increasing relationship with the stress. When the bedding angle was 30~60°, the creep deformation accounted for more than 50% of the total deformation. The bedding angles of 0° and 90° were dominated by the instantaneous strain during the stress loading process. For the flexible support of the roadway, the deformation caused by disturbance stress should be fully considered. (3) The uniaxial creep specimen mainly displayed compression shear tensile failure, with a small number of parallel cracks along the main fracture surface. The triaxial creep fracture mode changed to single shear failure. The confining pressure showed greater inhibition of the creep of the specimen with a bedding inclination of 0° and 90°. The strength design of the rigid support should refer to the original rock stress value of the roadway. The creep deformation and failure of the specimen with a bedding inclination of 30~60° were mainly controlled by the bedding. The included angle between the bedding dip angle and the maximum principal stress should be kept within 30~60° as far as possible in the roadway layout.

Suggested Citation

  • Yabin Wu & Jianhua Hu & Guanping Wen, 2022. "Study on Creep Characteristics of Water Saturated Phyllite," Sustainability, MDPI, vol. 14(19), pages 1-17, September.
  • Handle: RePEc:gam:jsusta:v:14:y:2022:i:19:p:12508-:d:930716
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    References listed on IDEAS

    as
    1. Haiyang Yi & Hongwei Zhou & Rui Wang & Di Liu & Jingyang Ding, 2018. "On the Relationship between Creep Strain and Permeability of Granite: Experiment and Model Investigation," Energies, MDPI, vol. 11(10), pages 1-15, October.
    2. Zhigang Yuan & Jintao Zhao & Shuqing Li & Zehua Jiang & Fei Huang, 2022. "A Unified Solution for Surrounding Rock of Roadway Considering Seepage, Dilatancy, Strain-Softening and Intermediate Principal Stress," Sustainability, MDPI, vol. 14(13), pages 1-18, July.
    3. Hai Wu & Qian Jia & Weijun Wang & Nong Zhang & Yiming Zhao, 2021. "Experimental Test on Nonuniform Deformation in the Tilted Strata of a Deep Coal Mine," Sustainability, MDPI, vol. 13(23), pages 1-14, November.
    4. Lin Gao & Xinyu Zhan & Pandong Zhang & Zhijie Wen & Zhenqian Ma & Dezhong Kong & Xiangtao Kang & Sen Han, 2022. "Study on the Dip Angle Effect of Asymmetric Deformation and Failure of the Gob-Side Coal–Rock Roadway in Gently Inclined Coal Seam," Sustainability, MDPI, vol. 14(12), pages 1-15, June.
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