Discrimination method of stability potential energy of overburden strata in metal mine supported by artificial pillars

Abstract

The invention provides a discrimination method of the stability potential energy of an overburden strata in metal mine supported by artificial pillars. A goaf overburden strata model is established, when the width of a goaf is larger than the length, the model is simplified to a thin section simply supported beam model, and stress distributions generated by the support force and tectonic stress ofa beam are calculated respectively; when the strata only supported by the beam, a plane-coordinate system is built, the stress function on a plane is calculated, and components of stress are obtained; when the strata is only subjected to the tectonic stress, the components of stress are calculated; when the strata is subjected to the combined action of the supporting force and the tectonic stress, the generated total stress distribution is calculated when the strata is subjected to the combined action of the supporting force and the tectonic stress, the potential energy of the whole strata is calculated, and the stability potential energy of the overburden strata in metal mine supported by artificial pillars is discriminated. The method can be used for analyzing the stress distribution and concentration degree, changing by the artificial pillars, of the goaf overburden strata, and meanwhile the stability of the goaf overburden strata is judged under supporting of the artificial pillars.

Description

technical field [0001] The invention belongs to the technical field of mining safety prevention and control in metal mines, and in particular relates to a method for discriminating the stability potential energy of an overlying rock system in a goaf of a metal mine. Background technique [0002] The geological structure and ore body shape of metal mines are different from layered coal mines. The overlying strata of coal mines are layered and not very thick. " or " thin slab ", most of the existing studies on the mobile failure of the overlying rock in metal mines are to directly apply the research methods on the overlying rock in coal mines to metal mines, including the geological conditions and thickness of the overlying rock. It is obviously inappropriate; in addition, due to the complex burial conditions of metal mines, gravity and structural stress become important factors affecting the stability of goaf surrounding rock and the movement of overlying rock in the process ...

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Problems solved by technology

figure 1 It shows that when the potential V changes from the upper leaf to the lower leaf, the control variable u>0 system is stable; when u<0, the system evolves from one state to another, and must cross the bifurcation set curve, there must be a mutation process, the system is unstable

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