| A correct understanding of tunnel surrounding rock structure characteristics and deformation anddamage mechanism and law of mine pressure appearance is effective for the premise of tunnel surroundingrock control. This thesis main coal mine soft rock tunnel as engineering background, the comprehensiveapplication of theoretical analysis, numerical simulation and in-situ observation of combining researchmethods, from the bolt (cable) supporting the theory, study the fracture mechanism of the surroundingrock, bolting supporting mechanism, mechanical mechanism and bolting tunnel surrounding rocksupporting method and parameterCoal for the deformation can be divided into the coal internal deformation along the seam and roof andfloor deformation and failure of rock interface.Coal deformatiom and failure is due to help the coal intermalloosening and coal seams along interface is extruded and cause,control of loose coal and coal by extrusionis for bolting of the objective.By the mine pressure observation reveals the tunnel mine pressure behavior,support design and selection of supporting provide scientific basis; improvement of roof and floor supportway and the control method, the tunnel in the service period to normal use, to ensure safety in production.In1121working face in mining process, found from the working surface near the3stations2#,3#,4#officeroof abscission layer is relatively large, the other station roof is relatively small and even constant.Tunnelgreatly different mechanical properties,strength, tunnel mine pressure appear obvious local.Through the numerical simulation of surrounding rock deformation and displacement in the whole, theworking face advancing process, working surface position of integral subsidence by strata, coal pillar effect,the adjacent tunnel rock the rock arch, tunnel surrounding rock tunnel convergence, sinking, while thetunnel of two help also somewhat convergent, the roadway near the coal pillar floor to floor heave.Considering the practical engineering, the final model to determine the dimensions of X x Y x Z=410m*1200m*150m, divided into138820units, each unit of X x Y x Z=2.5m*2.5m*2.5m, a total of15117nodes. The model side limit level mobile, fixed to the bottom of the material damage, with Mohr-Coulomb strength criterion。Using numerical simulation, numerical model was established, get the surrounding rockdeformation of tunnel displacement and stress, by simulation effect of adjacent working face tunneldeformation law;for the later similar geological condition engineering provides a feasible technical scheme. |
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