Abstract
In this paper, a numerical simulation is conducted to analyze an engineering practice pertaining to the in panel 2347, the discussion is focused on the following aspects: the influence of fault mining activation on fragmentation of surrounding rock in roof, surrounding rock failure of unsupported roadway under static load alone, surrounding rock failure of unsupported roadway under dynamic load and static load combination, damage of surrounding rock in supporting roadway under dynamic load and static load combination. The results show that, for the roadway surrounding rock with obvious dynamic disturbance, the compressive stress value can eliminate the influence of the tensile stress wave generated by the reflection of the compressive stress disturbance wave on the roadway wall. In the roadway support, it should provide a certain compressive stress to the surrounding rock of the surrounding roadway wall. An anchor support surrounding rock can significantly inhibit the tensile crack, shear the crack expansion and dislocation slip of coal gang, and it can also alleviate the tensile, compressive and shear failure of the roof carbonaceous mudstone. Because the dynamic load has a significant damage to the carbonaceous mudstone between roof anchors, it is necessary to reduce the anchor spacing and row spacing or enhance the stiffness and active stress of the protective surface member.
Highlights
At present, it is popular to employ the comprehensive mining hydraulic powered support in the mineral resources mining industry
It is popular to employ the comprehensive mining hydraulic powered support in the mineral resources mining industry. This method significantly reduces the occurrence of safety accidents in the industry, the dynamic disturbance phenomenon still appears in the roadway, which drives many experts to investigate the stability of surrounding rock of roadway after dynamic disturbance
Literatures [1, 2] studied the propagation and attenuation characteristics of dynamic disturbance waves in coal-rock media, it provides a theoretical basis for studying the stability of roadway surrounding rock; In literatures [3,4,5,6,7], discussions were given on the damage behavior of surrounding rock of roadway under dynamic disturbance from the perspective of numerical simulation and experiment, the results demonstrated that the surrounding rock fracture process does not depend on the direction of local dynamic disturbance; besides, when the dynamic disturbance appears, the surrounding rock of the roadway is mainly broken along the section
Summary
It is popular to employ the comprehensive mining hydraulic powered support in the mineral resources mining industry This method significantly reduces the occurrence of safety accidents in the industry, the dynamic disturbance phenomenon still appears in the roadway, which drives many experts to investigate the stability of surrounding rock of roadway after dynamic disturbance. A numerical simulation is conducted to analyze an engineering case pertaining to the in panel 2347, the discussion is focused on the following aspects: the influence of fault mining activation on fragmentation of surrounding rock in roof, surrounding rock failure of unsupported roadway under static load alone, surrounding rock failure of unsupported roadway under dynamic load and static load combination, damage of surrounding rock in supporting roadway under dynamic load and static load combination. It obtains the mechanism of improving the anchor control dynamic disturbance effect of surrounding rock in roadway
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