Abstract
This paper presents a comprehensive study of the stress distribution and stability analysis of a uniquely shaped roadway having a steeply dipping hard roof. The coal seam and its roof have a certain impact tendency, which is the internal condition of rock burst. The syncline tectonic stress causes the original rock stress to reach a higher level. The large amount of coal produced in the coal mine and the large movement range of the upper strata cause the huge mining additional stress around the stope. The impact load caused by “cantilever beam” fracture of hard roof can induce and strengthen rock burst. Its engineering geological setting encompasses the mining process and surrounding rock conditions of No. 6 Coal Seam in the 2130 coal mine of Xinjiang. Numerical simulations with theoretical analysis and field measurements investigated a proposed new truss combined support scheme for implementation. A comparison was made of the differences in the state parameters of the road under the new and old support conditions. The application of the new combined support technology changed the form of the stress distribution around the road. Apart from the displacements of the two coal sidewalls, the new support system notably reduced the displacement of roof and floor by 67.8% and 83.6%, respectively. After the implementation of the new support scheme, the frequency of the original rock burst in the working face is greatly reduced, the surrounding rock control and field application effects also remained good, and personnel and equipment safety and production plan have a good guarantee.
Highlights
Academic Editor: Chao Xu is paper presents a comprehensive study of the stress distribution and stability analysis of a uniquely shaped roadway having a steeply dipping hard roof. e coal seam and its roof have a certain impact tendency, which is the internal condition of rock burst. e syncline tectonic stress causes the original rock stress to reach a higher level. e large amount of coal produced in the coal mine and the large movement range of the upper strata cause the huge mining additional stress around the stope. e impact load caused by “cantilever beam” fracture of hard roof can induce and strengthen rock burst
A comparison was made of the differences in the state parameters of the road under the new and old support conditions. e application of the new combined support technology changed the form of the stress distribution around the road
More than 50% of the coal mines in Southwest China operate in steeply inclined coal seams
Summary
Inclined coal seam refers to coal seams that have a dip angle greater than 45°. The gravity force from the overlying coal and rock resolved along a steeply inclined bedding plane is more critically significant in considering the roadway failure than if the seams were horizontal or gently dipping. E resource development processes in steeply dipping coal seam mining faces are more susceptible to complex mechanical problems than the horizontal (or gently inclined) coal seams. Taking the uniquely shaped roadway of 2130 coal mine in Xinjiang as the research background, this paper puts forward the common control method of roadway stability based on stress transfer from the roof and high wall vulnerable parts. Under the existing support conditions, the roof of coal seam has weak impact tendency, and roof fall and rib spalling frequently occurred during the tunneling process, which seriously restricted the safety production of mining enterprises.
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