Study On Fracture Evolution And Energy Mechanism Of Surrounding Rock In Muddy Roadway Under Dynamic Disturbance

At present,argillaceous swelling soft rock is a kind of rock widely distributed in the world,accounting for 50% of the earth's surface rock types.Therefore,argillaceous soft rock plays a leading role in the stability of the project in many cases.Because the argillaceous soft rock roadway is characterized by weathering,cracking,swelling and softening when encountering water and other damage characteristics,the occurrence of argillaceous roadway accidents is frequent.At the same time,the research shows that the frequency of argillaceous roadway accidents is directly related to the complex dynamic disturbance caused by mining,driving,blasting and other activities.Therefore,in-depth study on the disaster mechanism of muddy roadway under dynamic disturbance has important theoretical significance and practical guidance value for ensuring the safety of coal mine production.Based on the engineering background of 226 track Shimen in Shanjiaoshu Mine,panzhou City,aiming at the control mechanism and technical problems of muddy roadway under dynamic disturbance,this paper comprehensively uses the research methods of field investigation,numerical simulation,theoretical analysis and field application to study the deformation and failure characteristics of muddy roadway under dynamic disturbance,the evolution law and energy characteristics of surrounding rock fracture,and the fractal characteristics of surrounding rock fracture The evolution characteristics and surrounding rock control technology are studied.The main conclusions are as follows:(1)Based on the field investigation of 226 track stone gate in Shanjiaoshu Mine,panzhou City,using the comprehensive analysis of drilling peep,non-destructive detector,bolt tension meter,field and mine pressure monitoring,the failure characteristics of surrounding rock of muddy roadway under dynamic disturbance are obtained.(2)Through the use of UDEC digital simulation software,this paper focuses on the analysis of the expansion and development of the fissures,the expansion range of plastic zone and the displacement of the roof and side of the surrounding rock of the weak muddy roadway before and after the dynamic disturbance,the increase of the depth of the roadway,the different horizontal stress,the different peak value of the stress wave and the different frequency of the stress wave,and the energy consumption of the muddy roadway under different conditions The influence of different conditions on the stability of weak muddy roadway and its failure characteristics are obtained.(3)Based on the digital image processing technology and fractal dimension theory,the fractal dimension calculation platform is programmed independently.This paper analyzes the developmentand expansion of the fracture field of the roof,floor and side of the muddy weak roadway before and after the dynamic disturbance,the increase of the roadway depth,the different horizontal stress,the different peak value of stress wave and the different frequency of stress wave,and reveals the stability of the surrounding rock of the muddy roadway under different conditions and the characteristics of joint development and failure through the change of fractal dimension.(4)According to the general situation of 226 track stone gate,through the dynamic step-by-step reinforcement principle,process control technology,support selection principle and strengthening support technology system,the paper puts forward the control technology idea of the tunnel and the support form of double anchor net + hollow grouting anchor cable;carries out the slurry optimization ratio test in the room;through the two support measures and the original support measures for 226 track stone gate Carry out numerical simulation and field application.