Study On The Influence Mechanism And Control Technology Of Mining On Floor Roadway

With the mining of mineral resources,mining depth,gradually to the deep development of roadway surrounding rock control harder,rock mass stress level has increased dramatically in a wide range of surrounding rock,continuous deformation seriously affect the stability of roadway,especially in this paper,the research of coal mine 11123 working face floor beneath the bottom pan alley pumping,in front of the working face in mining,bottom supporting a stable state,in the alley pumping on 11123 face mining disturbance action of the surrounding rock stress redistribution of stress to the bottom of deep,backplane varying degrees of damage,cause of deep rock mass of the strong disturbance,easy to affect the stability of roadway.Therefore,an in-depth study of the mechanical characteristics of floor roadway in the mining process of 11123 working face has important theoretical and practical significance for ensuring safe underground production.This paper mainly does the following research:(1)Based on the semi-infinite body theory of elastic mechanics and the engineering reality of 11123 working face and floor roadway under the floor of Pan No.2 coal mine,the mechanical model of floor stress distribution during mining on the working face of the overlying coal seam is established,and the propagation law of mining abatent pressure in the floor is studied.(2)Based on the above mechanical analysis,the failure mechanism of surrounding rock of roadway under non-uniform stress field was studied,and the mechanical parameters of surrounding rock affecting the radius of plastic zone were analyzed.The results were the calibration parameter ranges of reinforcement and reinforcement scheme.(3)Based on the determination of physical and mechanical parameters of rock strata and the method of numerical simulation,the mechanical characteristics of surrounding rock of roadway with bottom suction roadway in the mining process of working face under the original support conditions were studied,and a variety of reinforcement and reinforcement schemes were established for comparison,so as to determine the most reasonable reinforcement and reinforcement scheme.(4)Using electromagnetic principle of geological radar,to strengthen the supporting of roadway surrounding rock loose circle after multiple measurements:in the process of working face advancing,in order to avoid the occurrence of accidental to different forward distance of roadway surrounding rock loose circle thickness for multiple many-sided measurement,to e-nsure measurement accuracy,and to determine the feasibility of supporting schemes and reveal the development rule of roadway surrounding rock loose circle.Figure 68 table 3 reference 80...