Response Regular And Stability Analysis Of Stress Disturbance In Pillar Support System

With the introduction of the green mining model advocated by the country,people are increasingly paying more attention to the environmental of the mining area.The problem of surface subsidence caused by the mining is also increasingly attracting the attention of various scholars.The method of mining by pillar system not only can reduce the impact to the ground effectively,but also can make the resources under special conditions be used.At the same time,with the continuous mining of mines,underground mining activities have left a large number of pillars in the underground to ensure the safety of mining.These pillars are combined into a support system to maintain the rock safety and stability.while the process of underground mining activity is complex and varied.The system's balance is the result under the combined effects of multiple physical fields.It is not only affected by the static load of the overburden strata,but also the stress disturbances such as fracture of the strata formation,blasting rock and dynamic pressure during mining.The dynamic load not only destroys the pillars,but also increases the elastic potential energy of some elastic rock masses,making the hazards of the disasters more harmful.So it is great important to do research on the dynamic response and stability of the pillar support system under stress disturbances.In this paper,the ABAQUS numerical simulation software was used to study the response of pillar and supporting system under dynamic load disturbance,and the domino chain-lock instability process occurred in the pillar.For a single pillar,studied the dynamic load disturbance problem under different ground stresses.For the multiple pillars support system,researched the dynamic load disturbances of different widths and heights of the pillars.Based on actual conditions,simulated when the domino effect occurs in the column support system,the energy and stress transfer between the pillars causes the entire system to collapse.Through a series of resarch,it has been concluded that high stress disturbances and high ground pressure are the main causes of damage to the pillar.Increasing the pillar width to height ratio can enhance the stability of the pillar and the support system.In addition,this paper also inferred the law of dynamic load disturbance stress and the maximum principal strain growth under different buried depths of individual pillars,and the law of stress and strain and plasticity stress increase of different reserved width of pillar supporting system under dynamic load disturbance,and analyzed the system stability from its growth law.Finally,based on the instability of the pillar support system,based on the response law of the pillar support system,proposed that when useing the pillar mining method,for the safety and stability of the column under the stress disturbance,The central pillar should are the key monitoring and auxiliary pillar stability monitoring to ensure the safety and stability of the entire system,and provide certain theoretical support for the stability of the support system.