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

A technology of artificial ore pillars and discrimination methods, applied in the direction of strength characteristics, measuring devices, instruments, etc., can solve problems such as system instability

Active Publication Date: 2019-04-26
JIANGXI UNIV OF SCI & TECH
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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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  • Discrimination method of stability potential energy of overburden strata in metal mine supported by artificial pillars
  • Discrimination method of stability potential energy of overburden strata in metal mine supported by artificial pillars
  • Discrimination method of stability potential energy of overburden strata in metal mine supported by artificial pillars

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Embodiment Construction

[0101] A method for discriminating the stability potential energy of a metal ore overlying rock mass supported by artificial pillars, comprising the following steps:

[0102] Step 1: Construct a geological model of the overlying strata in the goaf; the model is based on the following assumptions:

[0103] ①Assume that the overlying rock is continuous, that is, assuming that the volume of the entire rock mass is filled by the medium that makes up the rock mass (in fact, all objects are composed of particles, which cannot meet the above assumptions. But as long as the size of the particles , and the distance between adjacent particles are much smaller than the size of the object, then the assumption of the continuity of the object will not cause significant errors). Similarly, when studying the rock mass roof, ore pillar and surrounding rock interaction system, it is considered that the rock mass roof basically meets the assumption of continuity;

[0104] ②Assume that the overl...

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/24G01N3/00
CPCG01N3/00G01N33/24
Inventor 赵康宁富金于祥严雅静王庆顾水杰黎强朱胜唐
Owner JIANGXI UNIV OF SCI & TECH
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