Study On Deformation Mechanism And Support Optimization Of Roadway Under Deep Well Impact And Dynamic Loading

In deep well mining,the pressure of mine is intense,especially in deep well impacting mine.Under the action of impact dynamic load,the deformation of surrounding rock along goaf is especially serious,and the support is difficult.This paper studies the deformation mechanism of surrounding rock under the impact dynamic load,and makes a reasonable and effective bolt support design for the surrounding rock under the impact dynamic load,which is of great practical significance for the safe and efficient production of the mine.In this paper,based on the engineering background of mining along the goaf in the deep well and strong impact ground pressure of the Gao Jiapu Coal Mine,the theory analysis,numerical simulation and field measurement are used to study the deformation mechanism of the surrounding rock and the bolt support optimization under the dynamic load impact of the 103 Working Face.The test of coal seam impact tendency shows that the 4 coal seam of the mine has a strong impact tendency,and there are many serious rockburst accidents occurring in the mine self built well so far,which belongs to the mine with strong impact ground pressure.The numerical simulation is used to simulate the deformation of surrounding rock under the action of impact dynamic load.The results show that the surrounding rock properties will deteriorate under the impact dynamic load,and the deformation of the surrounding rock will increase with the increase of the number of dynamic loads,resulting in the increase of the total deformation than that under the action of no impact dynamic load.Therefore,when the bolt support is designed,the overall strength and stiffness of the bolt support system should be improved,and the pressure bolt is used to increase the flexibility of the bolt support,so that some unnecessary support loads are removed.On the basis of analyzing the supporting effect and disadvantages of the original bolt supporting scheme,the coupling and pressure supporting nursing is used to optimize the bolt support design under the action of the impact dynamic load,and the original support scheme and the optimized support scheme are carried out by numerical simulation.The comparative analysis of supporting effect shows that the optimization scheme significantly reduces the plastic area and displacement of surrounding rock,and the control effect of roadway is better.The practical application of the optimized support scheme in the 103 Working Face along the goaf shows that the support parameters can adapt to the deformation requirements of the surrounding rock.The loose failure range of the surrounding rock and the deformation of the surrounding rock have been effectively controlled,the deformation degree is greatly reduced,and the overall support effect of the roadway is good.