Abstract
With the increasing mining depth of coal mines, the occurrence of rockburst, especially in mine roadways, is becoming critical as a severe dynamic disaster. This paper explores the stability control of deep mine roadways and solves the contradiction between the support and pressure relief of roadways by studying the use of an internal steel pipe for wall protection and a soft structure for energy absorption during repeated borehole drilling. Numerical simulations are performed to examine the effects of active support technology on the support structure during repeated drilling. Internal steel pipes can effectively prevent the support structure from being damaged. When the soft structure cracks, the energy transmitted from the rockburst to the roadway is significantly reduced. According to the deformation and failure characteristics of the surrounding rock of the 21170 roadway, the combination of anchor active support, hydraulic lifting shed support, and soft structure energy absorption is proposed. An engineering case study shows that the support method can effectively maintain the stability of the surrounding rock and ensure the safe mining of the working face. The proposed control method can provide reference for the prevention and control of rockburst in mine roadways under similar geological conditions.
Highlights
A rockburst represents a severe dynamic disaster that affects the safety and efficient production in underground projects such as coal mines [1, 2]
E energy absorption support technology, coupled rigid and flexible support technology, and “three-level support” technology involve filling a layer of energy absorbing material and adding energy absorbing materials with a weak stiffness between the surrounding rock and support, which can absorb a considerable amount of the impact energy and reduce the damage of the impact load on the support structure
To protect the support structure from damage, the support structure is protected by an internal steel pipe. e control effect of the support structure and the internal steel pipe used for borehole protection on the strength of the surrounding rock and integrity of the support structure is analysed through numerical simulations; the stress and plastic zone of the surrounding coal and rock mass are investigated
Summary
A rockburst represents a severe dynamic disaster that affects the safety and efficient production in underground projects such as coal mines [1, 2]. E energy absorption support technology, coupled rigid and flexible support technology, and “three-level support” technology involve filling a layer of energy absorbing material and adding energy absorbing materials with a weak stiffness between the surrounding rock and support, which can absorb a considerable amount of the impact energy and reduce the damage of the impact load on the support structure This type of support can passively absorb only a small amount of energy, and if a large energy rockburst is encountered, the roadway may be critically damaged. In this study, focused on providing roadway support through energy absorption by soft structures, relevant technical measures are adopted to realize the stress transfer and stress release from coal and rock masses in mine roadways and effectively prevent the occurrence of rockburst. In this study, focused on providing roadway support through energy absorption by soft structures, relevant technical measures are adopted to realize the stress transfer and stress release from coal and rock masses in mine roadways and effectively prevent the occurrence of rockburst. e anchor (cable)+ hydraulic lifting support + soft structure energy absorption technology is adopted. e technology of repeated borehole drilling and soft structure cracking is researched, and the contradiction between the support and pressure relief of a roadway under impact loading is coordinated, thereby enhancing the roadway performance
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