Study On The Destruction Rule And Control Technology Of Floor Slab Along Laneways

Retaining lanes along the road is a major improvement in coal mining technology and has many advantages.However,due to the rotation and sinking of overlying strata on the roof of the goaf during the process of retaining roadways along the empty roadway,the stress of the roadway is long,the stress concentration is large,and the influence of mining is strong;and the roadways along the empty roadway are to be experienced during the entire service period.The impact of dynamic pressure on the two working faces of the upper and lower working face,under complex stress changes,leads to a generally larger deformation of the roadway along the left-hand roadway.A serious kick drum can make the roadway section smaller,make it difficult to ventilate,and affect the passage of equipment and underground workers.In this paper,the background of the roadway at the roadway of the 15206 working face in Guanlingshan Coal Mine is taken as the research background.Field investigation,indoor experiments,theoretical analysis,numerical simulation and on-site monitoring methods are adopted.The in-depth study of technology led to the following conclusions:(1)Through the theoretical analysis of the movement law of the roof along the empty culvert and the failure mechanism of the floor of the roadway in the different lanes,the main reasons for the deformation of the floor are obtained,and the failure process of the floor of the roadway along the empty lane is described.In connection with the creep characteristics of rocks,the creep deformation characteristics of the floor slabs at each stage of the roadways are analyzed.Using the multi-objective comprehensive evaluation method-AHP,through the construction of the judgment matrix,the weight set of each geological factor is obtained,and the weight distribution value is consistent with the actual coal seam conditions in the mining area.(2)Taking the retaining lane along the 15206 face of the Guanlingshan Coal Mine as the engineering background,the drilling peek was first performed to analyze the lithology and joint fractures of the surrounding rock of the mine.Second,on-site sampling was performed for rock mechanics experiments to measure the surrounding rock mechanics parameters.Combined with the above-mentioned parameters of the surrounding rock,the factors that have a greater weight in the AHP study are used.The single-factor analysis method is used to conduct numerical simulation studies,and the trend of floor failure of gob-side lanes under different factors is studied.It is found that the floor drum is the most serious roadway in hard-bottom soft-bottom lithology;the deeper the roadway depth,the greater the amount of kick drum,and the faster the rate of increase;the width of the filling body has less influence on the roadway floor drum;An increase in width will result in a slight increase in the amount of kick drums and a smaller increase.(3)The theoretical calculation of the bottom drum volume of the roadway along the 15206 working face of the Guanlingshan Coal Mine was carried out,and the theoretical value of the total floor drum was 616.86 mm,while the proportion of the kick drum under the influence of creep was 19.96%.In addition,the Cvsic creep model was established using numerical simulation calculations.Assuming that the working face is outside the range of influence of advance and lag,the stress environment of roadway surrounding rock is stable,and the deformation of the roadway is mainly creep deformation.They are respectively at the center line of the roadway floor and the backfill body.The side bottom plate and the solid coal side bottom plate establish displacement measurement points to monitor the amount of the bottom drum.The simulation results show that the total amount of bottom heave at the side of the backfill is greater than that of the solid coal side in the lead-in effect of secondary recovery along the empty goaf.The total floor heave of the bottom side of the backfill is 339.94 mm,and the bottom floor of the backfill body is creep deformed.The proportion of the amount is 16.16%,the total side of the physical side of the coal drum is 220.88 mm,the proportion of the actual side of the coal floor creep deformation is 17.20%;and the floor of the roadway center line,the rock layer is more severe creep,the maximum kick drum The amount is 502.26 mm,and its creep deformation amount accounts for 23.92% of the total kick drum weight.There is no significant difference in the proportion of kick drums under the influence of theoretical calculation creep.According to the analysis of the simulation results,the curve of the amount of kick at the roadway along an empty roadway follows the typical deformation law similar to that of a typical creep curve.It is also divided into four stages: fast kick stage,decay kick stage,and stable kick stage.And accelerate the kick stage.(4)Displacement monitoring of the roadway roof subsidence volume,floor drum volume,and the displacement of the two gangs in the roadways along the 15206 face of the Guanlingshan Coal Mine are conducted to observe the deformation of surrounding rock before and after the pouring,verifying the previous text.The amount of theoretical calculations and numerical simulations of the amount of kick drums.In view of the actual geological conditions of the mine,three kinds of plans for strengthening the floor treatment are proposed.Using numerical simulation methods,comparative analysis of each program,to determine the optimal kick control program for the help angle bolt + bottom grouting bolt,for the mine The bottom-line governance in the future provides some lessons.