Research On The Control Technology Of Filling And Column Formation Of Roadway Floor Heave In Maiduoshan Coal Mine

This subject is based on the treatment of the large deformation of the floor heave in the fold zone of the 130604 working face of Maiduoshan Mine as the back of the project.Through theoretical analysis and numerical calculation methods,the risk factors of the floor heave occurrence in the mining process are determined.According to the stress conditions of the roadway and the characteristics of the rock pressure,the filling and column support technical plan is proposed,and the corresponding mechanical property material ratio test and preliminary construction technology are carried out.Finally,the on-site time is carried out.The main research results are as follows.Based on field experiments,it is determined that the main cause of the floor heave of the 130604 working face of Maiduoshan Coal Mine is the high level of structural stress in the fold zone,the superposition of the supporting pressure of the working face and the structural stress,and the mining disturbance of the working face increases the instability of the roadway.The bottom of the roadway in 130604 working face is deformed.Based on the FLAC3 D numerical simulation calculation,the roof and floor distribution characteristics of the 130604 working face are studied in the three stages of not driving,driving end and after mining.It is found that after the roadway has been excavated,the horizontal stress on the roof and floor of the roadway is higher than that when it is not excavated.After the stoping,due to the stress transfer,the horizontal stress of the roof and floor of the auxiliary roadway decreases.When the vertical stress has never been excavated to after excavation and then to stoping,the vertical stress value of the roof and floor of the roadway has always been on the rise.The stress around the roadway is relatively concentrated.The vertical stress of the roof is about 2.3 times that of the non-driving period,and the floor is about 2.2 times.Through the optimization of the filling material ratio,it is found that when the gypsum/slaked lime ratio is 7,the water-cement ratio is 1.0?1.2,the compressive strength is the largest and the material fluidity is better;and through the membrane bag and ring reinforcement combination experiment,it is found that the pillar The application of ring ribs on the outside of the film bag can effectively reduce the friction effect at the end and further increase the residual strength of the pillar.The residual strength after the peak can reach 80% of the peak strength.Compared with the traditional wooden stack support,its rigidity is about twice that of the wooden stack;compared with the single hydraulic prop pillar,the packed column has the advantages of large supporting area and high residual strength.Through the application of the filling column technology process in Maiduoshan,it is found that the filling column technology and the wood pile support effect are compared.The filling column support technology effectively suppresses the deformation of the bottom plate,and the treatment effect of the bottom heave is more obvious;at the same time,it avoids The roadway cuts the roof due to the influence of the mobile supporting pressure,and the filling and column technology has a significant effect in the control of the surrounding rock in Maiduoshan Coal Mine.This thesis has 56 figures,22 tables and 78 references.