| Based on the deformation instability phenomenon of 14102 auxiliary transport gateway(dynamic pressure roadway) under the condition of hard roof in Mjialiang collery, the thesis adopted the method of numerical simulation and field measurement, to analysis the deformation instability mechanism of dynamic pressure roadway under the condition of hard roof, the main conclusions are as follows:(1) Through numerical simulation analysis of the broking mechanism under the condition of hard roof, studies the broken feature of hard roof along the coalface advancing direction and along the coalface, determine the key layer of working face and tunnel rock pressure control.(2) By analyzing the stress distribution curve along goaf forward to mining face under the condition of 20 m section coal pillar width, studies the influence scope and degree of the side abutment pressure and axial abutment pressure, determine the deformation instability mechanism of dynamic pressure roadway under the condition of 20 m section coal pillar width.(3) In order to make dynamic pressure roadway to avoid strong dynamic load effects, studies vertical stress distribution of coal pillar, plastic zone distribution and the characteristics of the deformation of surrounding rock under different section width of coal pillar, It is concluded that the reasonable width of section coal pillar is 50 m.(4) In view of special pressure environment and characteristics of damage of dynamic pressure roadway, this thesis used high strength high torque yielding anchor bolt to support dynamic pressure roadway, and solidify the roof and coal pillar rib,which means improving their bearing stability can maintain the stability of structure of surrounding rock.(5) The study determined the reasonable width of section coal pillar and support parameter of Majialiang collery. The engineering test illustrated that the technology could control the surrounding rock effectively, and could meet the production requirements. |
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