| The problem of deep rock roadway surrounding rock stability control in tunnelingand mining process has become the critical issues. With the increasing of rock miningdepth, more complex conditions have become increasingly prominent. It is difficult toguarantee roadway stability issues, mining costs, security and other aspects. Therefore,doing research in deep soft rock mining support mechanism and influencing factors,analyzing support parameters optimization, determining the optimal parameters andprocess support have more and more important theoretical and practical significance insafety, high efficient production of the colliery.Based on the comprehensive data collected in the practice to analyse deformationand failure characteristics, factors influencing the deformation shape deformation andfailure in the deep soft rock roadway, study the failure mechanism of rock deformation,then master the deformation mechanism in different roadways.For the roadway conditions and the actual site, choose the supported programs of theanalysis of the technological characteristic.Do simulation analysis of theunsupported,bolting, bolting with wire mesh,arching support by means of FLAC3D. Afterbolting, the level of stress, pressure over the vertical direction reduced an order ofmagnitude compared with unsupported roadway and the shear stress area reducedsignificantly. Compared with the unsupported roadway, two-sided displacement and roof-floor displacement decreased by85.9%and85.7%. Plastic zone damaged area is reduced,the number of flexibility cells was obviously increased. Bolting support is the mostsignificant one to improve the effect of rock conditions in the three kinds of supportprograms.Through on-site construction and monitoring, rock deformation has been effectivelycontrolled after bolting. Rheological characteristics of surface displacement disappears ina state of convergence. Bolting not only to strengthen the supported system carryingcapacity, but also greatly enhanced the performance of self-supporting rock, andeffectivly controled the severe deformation of the roadway, improving the stability ofsurrounding rock.The results contrast with the actual technology research shows that observationsmatch FLAC3Dnumerical simulation results. It further confirms the theory and researchachievements of numerical simulation, the accuracy of numerical model and thepredictive accuracy of utility which laid the foundation of constitutive model and supporttechnology for the soft rock. |
PDF Full Text Request