Stress analysis of longwall top-coal caving face adjacent to the gob

ABSTRACT

In longwall top-coal caving (LTCC) mining, progressive failure process of top coal is closely related to the mining-induced stress. In order to achieve failure mechanisms of the top coal, stress distribution of the LTCC face adjacent to the gob is analysed in this study with field investigation and numerical simulation. The concentration and rotation phenomenon of the principal stress are recognised. Particular emphasis is placed on rotation characteristics of the principal stress in the top coal adjacent to the gob. In addition, the influence provided by periodic rupture of the main roof on the mining-induced stress is discussed.

KEYWORDS:

• Longwall top-coal caving
• principal stress
• stress concentration
• stress rotation
• rupture of the main roof

Acknowledgements

This study is sponsored by National Key R&D Program of China (Grant No. 2017YFC0603002), National Natural Science Foundation of China (Grant No. 51974264) and State Key Laboratory of Coal Resource and Safety Mining, China University of Mining & Technology (SKLCRSM18KF023). The authors are grateful for their support.

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was supported by the Key Technologies Research and Development Program [2017YFC0603002];National Natural Science Foundation of China [51674264];State Key Laboratory of Coal Resource and Safety Mining, China University of Mining & Technology [SKLCRSM18KF023].