| Based on the practical problem that the surrounding rock of layered clastic rock roadway in Jinfeng gold deposit is affected by dynamic disturbance,and taking the stability control of surrounding rock of dynamic disturbance roadway as the study goal,this paper uses various means to study the response characteristics and stability control of layered clastic rock roadway under dynamic disturbance.The main control factors affecting the surrounding rock stability are clarified,and the deformation and failure characteristics of dynamic disturbance roadway are mastered,and the stability control technology of dynamic disturbance roadway surrounding rock is put forward.The main study results are as follows:(1)According to the field investigation,it is found that the roadway surrounding rock is broken,poor stability and unsatisfactory support effect due to dynamic disturbance,and the average RQD is 31.63%.The main factors affecting the deformation and failure of roadway surrounding rock are clarified,and the theoretical analysis shows that the major factors are the buried depth,the amplitude of dynamic load and the thickness of weak mudstone.(2)Through physical experiments,the deformation and failure characteristics and laws for dynamic disturbed layered clastic rock roadway surrounding rock are studied.Through the measurement of mechanical parameters of similar specimens,the similar ratio of each rock stratum of roadway surrounding rock similar model is determined,and then the model is made for test.The crack development characteristics and strain field evolution law of similar model of roadway surrounding rock under different dynamic load amplitude and different thickness of weak mudstone are obtained.(3)Using numerical simulation,the conditions of only static load,different buried depth,different disturbance load amplitude and different thickness of weak mudstone are selected as the investigation objects.Through the deformation and failure characteristics of dynamic disturbance roadway surrounding rock under various conditions,the influence of dynamic disturbance on the stability of surrounding rock of layered clastic rock roadway is systematically studied.(4)The control technical scheme of bolt-anchor cable combined support in dynamically disturbed layered clastic rock roadway is proposed and applied in the field.The numerical simulation and field monitoring results of surrounding rock control effect of dynamic disturbance roadway show that the support optimization scheme is effective and feasible,and the overall stability of roadway surrounding rock is significantly improved. |
PDF Full Text Request