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Geomechanics and Engineering
  Volume 37, Number 3, May10 2024 , pages 293-306
DOI: https://doi.org/10.12989/gae.2024.37.3.293
 


Research on the deformation characteristics and support methods of the cross-mining roadway floor influence by right-angle trapezoidal stope
Zhaoyi Zhang and Wei Zhang

 
Abstract
    Influenced by the alternating effects of dynamic and static pressure during the mining process of close range coal seams, the surrounding rock support of cross mining roadway is difficult and the deformation mechanism is complex, which has become an important problem affecting the safe and efficient production of coal mines. The paper takes the inclined longwall mining of the 10304 working face of Zhongheng coal mine as the engineering background, analyzes the key strata fracture mechanism of the large inclined right-angle trapezoidal mining field, explores the stress distribution characteristics and transmission law of the surrounding rock of the roadway affected by the mining of the inclined coal seam, and proposes a segmented and hierarchical support method for the cross mining roadway affected by the mining of the close range coal seam group. The research results indicate that based on the derived expressions for shear and tensile fracture of key strata, the ultimate pushing distance and ultimate suspended area of a right angle trapezoidal mining area can be calculated and obtained. Within the cross mining section, along the horizontal direction of the coal wall of the working face, the peak shear stress is located near the middle of the boundary. The cracks on the floor of the cross mining roadway gradually develop in an elliptical funnel shape from the shallow to the deep. The dual coupling support system composed of active anchor rod support and passive U-shaped steel shed support proposed in this article achieves effective control of the stability of cross mining roadways, which achieves effective control of floor by coupling active support and preventive passive support to improve the strength of the surrounding rock itself. The research results are of great significance for guiding the layout, support control, and safe mining of cross mining roadways, and to some extent, can further enrich and improve the relevant theories of roof movement and control.
 
Key Words
    cross mining roadway; right angle trapezoidal stope; short distance coal seam; stress distribution; zoning support
 
Address
Zhaoyi Zhang: State Key Laboratory of the Gas Disaster Detecting, Preventing and Emergency Controlling, Chongqing 400037, China;
CCTEG Chongqing Research Institute, Chongqing 400037, China
Wei Zhang: School of Architecture and Engineering, Liaocheng University, Liaocheng 252000, China
 

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