| During the excavation process of roadway in deep mine,due to the increase in the depth of the roadway,primary rock stress increased,and some mechanical behaviors of roadway in deep mine have changed.The destruction characteristics of the surrounding rock of the roadway gradually show different rules than those in the shallow part.Correlation theory is no longer universal.In this paper,the failure mechanism of the support of the deep roadway is taken as the research object,combined with the geological conditions of No.3 exploration roadway in the 7th mining area of Xingcun Coal Mine,the deep wells are studied by means of data collection,literature review,theoretical analysis,numerical simulation,field practice,etc.During the process of tunneling,the stress and energy evolution law of surrounding rock is analyzed.The failure mechanism of the support body is analyzed.The reinforcement technology is proposed in combination with the failure mechanism.The numerical simulation and industrial experiments are carried out to verify the reinforcement effect.The main research conclusions are as follows:(1)Analyze the evolution of the surrounding rock stress and energy of the deep coal roadway during the driving process,and obtain the horizontal stress and vertical stress laws of the surrounding rock of the roadway roof under different digging distances.When the roadway is driven forward,the horizontal stress of the surrounding rock of the roadway And the vertical stress peak is transferred to the deep part,and there is a stress adjustment process in which the horizontal stress in the deep surrounding rock is continuously increasing and the vertical stress is continuously decreasing.(2)The evolution of the elastic energy in the surrounding rock of the roadway under different burial depths and the occurrence of the elastic energy in the surrounding rock during the excavation of the roadway under 1200 m depth are analyzed.The area of maximum elastic energy gradually shifts deeper.As the tunnel advances,the elastic energy at the peak of the surrounding rock above the roof of the tunnel is continuously released.When the tunneling distance changes from 3m to 6m,the elasticity is released in the area of 3m above the roof of the tunnel The energy range is the largest.(3)Research on the support failure mechanism of No.3 exploration roadway in the 7th mining area of Xingcun Coal Mine through numerical simulation,comprehensively considering the surrounding rock stress and energy evolution,the strength of the anchor cable and the site,and analyzed the failure mechanism of the support body.As the roadway is driven forward,the suspension effect of the anchor rod loses its point of action.Similarly,due to the transfer of the main bearing area to the deep,the ability of the anchor rod to control the separation of surrounding rock is also greatly reduced,most of the load of the roof is borne bythe pin rope,as the surrounding rock gradually breaks from shallow to deep,the load of the broken surrounding rock that the anchor cable needs to bear continues to increase.When the surrounding rock in the main bearing area suddenly breaks,the surrounding rock of this area will produce transient dislocation and the axial forceconcentration area of anchor cable will break.(4)The reinforcement technical parameters were determined.The slurry reinforcement technique was adopted to make the slurry penetrate into the cracks in the surrounding rock to improve the mechanical parameters of the surrounding rock and the mechanical characteristics of the surrounding rock to achieve the effect of roadway reinforcement.Industrial experiments were carried out on site.The results show that the stability and deformation of the surrounding rock can ensure the normal use of the roadway,the supporting body is in good condition,and there is no failure phenomenon.Controlled.Effectively controlled no.3 exploratory lane in no.7 mining area of xingcun coal mine.This thesis has 61 figures,12 tables,and 88 references. |
PDF Full Text Request