Study On Stability Control Technology Of Mining Roadway Surrounding Rock In Wulihou Coal Industry

There are many special geological structures such as faults and monoclinics in the coal measure strata,and the continuity and stability of the coal strata are damaged,which is not conducive to the control of the surrounding rock of the roadway.The dip angle of the coal seam in the lower group of wulihou coal industry changes greatly and there are faults.The layout of the mining roadway is greatly affected by the inclined roof,and it is difficult to maintain the fault roadway when driving,Based on the research background of centralized belt transportation downhill of lower group coal in wulihou coal industry,this paper studies the surrounding rock stability control technology of lower group coal preparation roadway in wulihou coal industry through a combination of field investigation and measurement,theoretical analysis,numerical simulation,laboratory test and other research methods,and obtains the following results:(1)There is a large angle between the layout direction of the main roadway and the direction of the maximum horizontal principal stress in the lower group of wulihou coal industry.The physical and mechanical strength of the mudstone and coal body in the roof and floor of the roadway is small.The roadway is affected by faults and inclined coal strata,and the stability of surrounding rock is not easy to control;(2)Through a variety of theoretical analysis methods and numerical calculation to simulate the failure deformation and stress distribution of surrounding rock under centralized belt transportation of lower group coal under different support schemes,it can be seen that when the row spacing of anchor bolts is 900 mm and the row spacing of anchor cables is 1800 mm,the roadway construction is economical and reasonable,and can ensure safe use in the service cycle;(3)When the inclined angle of rock stratum changes during the driving process of centralized belt transportation of lower group coal down the mountain,the damage of roadway surrounding rock will increase with the increase of inclined angle of rock stratum.When the inclined rock stratum is greater than 18 °,the deformation of roadway surrounding rock will increase rapidly with the increase of inclined angle of rock stratum.In order to ensure the normal operation of belt conveyor,it is necessary to straighten by sections and appropriately adjust the angle of belt transportation down the mountain;(4)When the lower group coal is transported down the mountain by concentrated belt during excavation,when a fault is encountered,the surrounding rock of the roof of the lower group coal is relatively broken in the area about 35 m in front of the fault.When the fault is exposed by excavation,the roadway roof and weak surface are extremely broken and need special reinforcement and maintenance;after the excavation face passes through the fault,the influence of the footwall is weakened,the roof integrity is maintained and the wall disappears;(5)Combined with the research results,the support design of the main roadway of the lower coal group is carried out.When the roadway is arranged in special geology,grouting reinforcement measures can be taken to improve the properties of the roadway surrounding rock and improve the bearing capacity of the surrounding rock.The ground pressure monitoring results show that the bolt is stable,and the support design and special geological reinforcement measures can effectively control the stability of the roadway surrounding rock.This thesis contains 55 pictures,24 tables and 88 references.