Study On Surrounding Rock Stability And Non-uniform Support Technology Of Gob-side Roadway Influenced By Dynamic Pressure

As the coal mining strength increasing, mining geological environment is gettingmore complex in coal mine in China. There were supporting problems of high stresssoft in many mining areas, especially supporting problems of gob-side roadwaysinfluenced by dynamic pressure. So it is important of practical significance to studyon surrounding rock stability and support technology of gob-side roadways in highstress influenced by dynamic pressure.In this paper, based on the actual geological conditions of gas tail roadway of1110working face of11#coal mining area in XiaYukou mine, by using theoreticalanalysis, numerical simulations and field test method, the paper researched on thequestions of surrounding rock control caused by dynamic pressure, and non-uniformsupport technology of gob-side roadway.First of all, based on the analysis of the factors affecting the stability of gob-sideroadway surrounding rock and failure forms, combined with the combination ofon-site investigation results and the actual geological and mining conditions.Theresults has obtained that the main factors of the gas tail roadway of1110workingface.That is mining influence when1108working face close to the roadway, adjacentroadway driving disturbance, and the influence of this section working face’s leadabutment pressure.Secondly, the analysis of the above-mentioned factors affecting the stability ofsurrounding rock by numerical simulation showed that: because of rock mass strength,stress state and failure character of the mining roadway surrounding rock compositestructure of each part, the difference was very remarkable. Influenced by dynamicpressure, mining roadway surrounding rock deformation showing a significantnon-uniformity and non-symmetry, weak structural body of surrounding rock andweak support bearing structure shear dilatancy deformation strongly. Thus, causingthe surrounding rock-supporting bearing structure produced structural instabilityfailure.Finally, according to the characteristics of gob-side roadway surrounding rockdeformation and failure characteristics of surrounding rock-supporting bearing causedby dynamic pressure, analysis the non-uniform support technology. The results showthat: reinforcing roof and sides can effectively control roadway floor heave caused bydynamic pressure; reinforcing weak structural body of surrounding rock and weak support bearing structure can greatly improve them structural instability. Thusimproving the global stability of surrounding rock-supporting bearing structure.Based on the above analysis, roadway floor heave control technology andnon-uniform support technology had practiced, The roadway deformation informationand supporting system carries information monitoring results show that thenon-uniform deformation of surrounding rock is greatly reduced, and roadway floorheave has been effectively controlled,and the system under load bearing support hasbeen optimized.The research results for the gob-side roadway surrounding rock controltechnology influenced by dynamic pressure provided an important technical reference,and as same to control of the floor heave. Not only to gas tail roadway of1110working face, but also for the other similar conditions coal mine have importantsignificance.