Abstract
In order to explore the deformation and failure evolution characteristics of the surrounding rock during the connection process of the deep rock burst drivage roadway under the dynamic load disturbance, and based on this, the catastrophe mechanism of the roadway is analyzed, taking the rock burst accident of Longyun Coal Industry in Shandong Province on October 20, 2018, as the engineering background. FLAC3D was used to study the distribution evolution law of displacement, plastic zone, and stress field in the whole process of “Roadway Drivage-Deformation and Failure-Instability and Disaster” in the surrounding rock of deep roadway. The research results show that under the conditions of high stress and dynamic load disturbance, the surrounding rock deformation and failure are significant during the connection of the thick-top-coal roadway in deep, the roof is the most, the two ribs are the second, and the roadway top-coal is in an “inverted trapezoid” sag pattern. When the length of the bolts is limited or the anchoring force of the cables is not enough to effectively restrain the roof, the impact of dynamic disturbance on the plastic damage of the roof is greater than that of the two ribs and the floor, and the plastic damage of the coal seam roof affecting the surrounding rock deformation of the roadway drivage played a leading role.
Highlights
With the increasing depletion of shallow coal resources, coal mining depth, scope, and intensity continue to increase in China, and deep mining will become the norm in the development of coal resources in the future [1]
The depth of roadways has increased daily; the conditions such as high stress, strong dynamic disturbance, and soft and broken surrounding rocks have become more complex. ese development trends have an adverse effect on the roadway drivage and stability of surrounding rock, inducing severe dynamic disasters such as roof caving and rock burst
As of June 2019, there are 121 mines in production and identified as rock burst mines, which are widely distributed in 14 provinces, cities, and autonomous regions [2]
Summary
With the increasing depletion of shallow coal resources, coal mining depth, scope, and intensity continue to increase in China, and deep mining will become the norm in the development of coal resources in the future [1]. Yuan et al [20] used FLAC3D to conduct a numerical study on the form characteristics and evolution laws of surrounding rock plastic zone in deep dynamic pressure mining roadway. Jing et al [25] took the rock burst accident of Longyun Coal Industry as the engineering background, based on the particle flow software PFC2D simulated the mesostructure evolution process of rock burst roadway under the coupling action of high stress and dynamic disturbance. By using the finite difference numerical simulation method of engineering scale, the deformation and failure evolution of surrounding rock under the superposition of mining disturbance and external dynamic load, and the mechanism of instability causing the disaster are deeply studied through the detailed simulation of the process of roadway formation in the accident roadway and the application of dynamic load. Overview of Roadway Support Technology. e No 3 connection roadway of drainage roadway at panel 1303 is excavated along the floor, and the full section is excavated at one time. e designed rectangular section has a
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