Coal Engineering ›› 2024, Vol. 56 ›› Issue (10): 40-47.doi: 10.11799/ce202410005

Previous Articles     Next Articles

A review on basic principle and disaster prevention and control application of staggered mining

  

  • Received:2024-09-09 Revised:2024-09-18 Online:2023-10-20 Published:2025-01-16

Abstract: To improve the problems of low coal recovery rate, difficult surrounding rock support, high gas emission, and frequent rock bursts in longwall top coal caving, the research development of staggered mining was summarized from three aspects: the basic principle of staggered mining, the control model of mine disaster using staggered mining and its engineering application. At present, the dynamic characteristics of staggered mining were mainly studied by on-site measurements using borehole stress gauges and similar simulation platform tests. Uniaxial compression experiments and numerical simulation calculations were widely used to study the energy conversion characteristics of staggered mining. The reasons for mine disasters caused by longwall top coal caving were summarized as the rapid release of energy accumulated in the coal seam and roof due to the large-scale and high-intensity collapse of the top coal, which leads to a chain reaction of mine disasters such as large deformation of the surrounding rock, gas exceeding the limit, and rock burst caused. Based on the staggered mining, three kinds of mine disaster control models were elaborated, and the joint support mechanism of staggered double roadway was explained from the perspectives of the surrounding rock environment and plastic development. The gas concentration distribution characteristics of staggered mining and longwall top coal caving were explained from the perspectives of porosity and flow field concentration. The energy distribution characteristics of staggered mining and longwall top coal caving were explained from the perspective of elastic strain energy and dissipation energy. The practical engineering applications of staggered mining technology were elaborated, such as the 1411 working face of Huafeng Coal Mine, the 18111 working face of Zhenchengdi Coal Mine, and the 5 (9) working face of Laogongyingzi Coal Mine. The on-site measured data shows that staggered mining technology can significantly reduce the advance abutment pressure and upper corner gas concentration during the working face mining, and can effectively prevent the occurrence of mine disasters. In the future, the prevention and control of mine disasters based on staggered mining still need to conduct in-depth research in basic theory, studying the laws of rock movement and energy evolution with the filling of staggered goaf, achieving the control of surface subsidence, and developing the comprehensive intelligent mining technology for staggered mining face, to achieve the goal of safe mining, green mining, and intelligent mining.

CLC Number: