| Combining with the domestic and foreign research status and Fen xi Rui tai mine actual situation,on the base of mining subsidence and strata control of key layer theory and filling mining theory, combined with the interaction mechanism of the filling body rock, physical model is established and simulated using FLAC3D. In this paper, the results of FLAC3D simulation are carried out, and the stress and displacement distribution of the tunnel at the rear of the 50m is extracted from the distance, and the data are analyzed and compared with the field observation. The following contents are studied in this paper:(1) a combination of space and keeps the lane technology of mine pressure behavior law and roadside barrier mechanism, a comprehensive analysis of the:Along go left old roadway roof breaking rules and mechanical properties of roadway surrounding rock, along go left lane on the overlaying strata movement rule and stope surrounding should force distribution and support pressure, paste filling filling mechanism, for paste filling along go left lane technology research provides a theoretical basis.(2) the technical parameters of 0401 working face excavation and mining roadway support were compiled, and the actual measurement of the roof and floor of the roadway, the deformation of the two.(3) using 3D FLAC numerical simulation, the relationship between the surrounding rock stress, deformation, and the width of the back fill was analyzed.(4) several optimization schemes are proposed to strengthen the support strength of the filling body, and the optimized results of the 3D FLAC are compared with the numerical simulation.(5) according to the requirement of the time of the air leaving lane, two reinforcement schemes are put forward. The advantages and disadvantages of the two reinforcement schemes are analyzed by using 3D FLAC numerical simulation. The results show that the simulation results are close to the field and can be used as the theoretical basis of the actual work. |
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