Change rule of static mechanical response of coal and rock in stope under the influence of structural transient
To clarify the evolution law of mechanical response of coal and rock in stope,based on the engineering background of W1143 longwall fully mechanized mining face at Kuangou Coal Mine,we adopt a combination of physical similarity simulation experiment and numerical calculation to establish a numerical simulation pre-treatment method to study the change rule of static mechanical response of coal and rock,on the basis of defining the transient characteristics of the spatial structure of overlying rocks before and after crushing.The results show that the overlying rock spatial structure is composed of rock strata in different lithology outside the fracture and under the mining influence,which is the internal cause for different mechanical responses of coal and rock under the influence.During compaction,due to the instantaneity of hard rock breaking,transient changes in the overburden spatial structure will change for an instant.Hence,the static mechanical response of coal and rock in stope changes step by step,which is essentially a dynamic process.This paper only com-pares and analyzes the equilibrium states before and after the transient changes.The transient spatial structure of overlying rocks causes the step change of the stress field and displacement field of coal and rock in stope,and the step change is concentrated near the transient area.The farther the transient region is,the smaller the change happens.
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