Abstract
With the deployment of China’s energy strategy in the western regions, complex geological mining conditions such as thin bedrock and ultrathick seams in western China have caused a series of problems such as serious deformation of the surrounding rock at the ends of the working face and the increase in the lead abutment pressure of the roadways; the research on end roof deformation in the resource exploitation in western China has become one of the great demands of the industry. Based on the failure characteristics of rock mass, relying on the actual mining geological conditions of a coal mine in Inner Mongolia, the failure characteristics of the overlying rock strata under the influence of mining were simulated and analyzed using similar material simulation experiment, which intuitively reproduced the failure and deformation processes of the immediate roof, main roof, and key strata and revealed the mechanical mechanism of the directional weakening of the end roof. It is of great significance for the stability control of the surrounding rock at the end of the fully mechanized caving face in the thin bedrocks and ultrathick seams, reducing the abutment pressure of gate roadway and controlling the spontaneous combustion of residual coal in the goaf.
Highlights
With the deployment of China’s energy strategy in the western regions, complex geological mining conditions such as thin bedrock and ultrathick seams in western China have caused a series of problems such as serious deformation of the surrounding rock at the ends of the working face and the increase in the lead abutment pressure of the roadways; the research on end roof deformation in the resource exploitation in western China has become one of the great demands of the industry
Based on the failure characteristics of rock mass, relying on the actual mining geological conditions of a coal mine in Inner Mongolia, the failure characteristics of the overlying rock strata under the influence of mining were simulated and analyzed using similar material simulation experiment, which intuitively reproduced the failure and deformation processes of the immediate roof, main roof, and key strata and revealed the mechanical mechanism of the directional weakening of the end roof. It is of great significance for the stability control of the surrounding rock at the end of the fully mechanized caving face in the thin bedrocks and ultrathick seams, reducing the abutment pressure of gate roadway and controlling the spontaneous combustion of residual coal in the goaf
In order to effectively control the deformation of surrounding rock at the ends, a lot of research work has been carried out on the mechanical mechanism of deformation of end roof at home and abroad in recent years, and a large number of theoretical and technical application results have been obtained
Summary
Mechanism of instability and failure of the arc triangle area; the scholars Sellers and Klerck [10] have found through study that the discontinuous surface generated inside the surrounding rock due to fissures and weak faces in the surrounding rock of the roadway as well as the discontinuity surface created by joint connection in the surrounding rock is one of the main reasons for the fracture spacing in the surrounding rock of the roadway. e presplitting pressure relief technology is [11] a technique to change the physical and mechanical properties of the rock mass through artificial intervention such as hydraulic fracturing or presplitting blasting, so as to weaken the structural strength of the coal rock mass and increase the fissure content, thereby achieving the purpose of permeability improvement or pressure relief. e presplitting pressure relief technology has been widely used in the prevention and control of low-permeability coal seam gas extraction, rock burst, and the control of surrounding rock in mining space [12, 13]. Erefore, in order to further investigate the deformation rules of surrounding rock in directional weakening of end roofs, in this paper, a similar material simulation experiment was used, based on the failure characteristics of rock mass and relying on the actual mining geological conditions of a coal mine in Inner Mongolia, to simulate and analyze the failure characteristics of the overlying rock strata under the influence of mining; it intuitively reproduced the failure and deformation processes of the immediate roof, main roof, and key strata and revealed the mechanical mechanism of the directional weakening of the end roof, which is of great significance for the stability control of the surrounding rock e surface of the well field in Ordos Loess Plateau of the western regions is overlaid by a large area of loess and aeolian sand, and the bedrock is exposed only in larger gullies. E coal seam roof is mainly semihard and has a relatively high proportion of soft rock on the floor, most of which is mudstone, claystone, and carbonaceous mudstone.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
