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author:

Wu, Yabin (Wu, Yabin.) [1] | Hu, Jianhua (Hu, Jianhua.) [2] (Scholars:胡建华) | Wen, Guanping (Wen, Guanping.) [3]

Indexed by:

SSCI Scopus SCIE

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 similar to 60 degrees, 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 3060 degrees, the creep deformation accounted for more than 50% of the total deformation. The bedding angles of 0 degrees and 90 degrees 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 degrees and 90 degrees. 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 similar to 60 degrees were mainly controlled by the bedding. The included angle between the bedding dip angle and the maximum principal stress should be kept within 30 similar to 60 degrees as far as possible in the roadway layout.

Keyword:

creep characteristics phyllite roadway support rock mechanics stress environment

Community:

  • [ 1 ] [Wu, Yabin]Changsha Inst Min Res Co Ltd, Changsha 410012, Peoples R China
  • [ 2 ] [Wu, Yabin]State Key Lab Safety Technol Met Mine, Changsha 410012, Peoples R China
  • [ 3 ] [Hu, Jianhua]Fuzhou Univ, Zijin Sch Geol & Min, Fuzhou 350108, Peoples R China
  • [ 4 ] [Wen, Guanping]Cent South Univ, Sch Resources & Safety Engn, Changsha 410083, Peoples R China

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Source :

SUSTAINABILITY

ISSN: 2071-1050

Year: 2022

Issue: 19

Volume: 14

3 . 9

JCR@2022

3 . 3 0 0

JCR@2023

ESI Discipline: ENVIRONMENT/ECOLOGY;

ESI HC Threshold:64

JCR Journal Grade:2

CAS Journal Grade:3

Cited Count:

WoS CC Cited Count: 0

SCOPUS Cited Count: 1

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 0

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