Method for judging stability of goaf roof

A discrimination method and goaf technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems that are not involved, and achieve the effect of simple implementation process

Active Publication Date: 2015-06-17
JIANGXI UNIV OF SCI & TECH
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  • Description
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Problems solved by technology

However, this method has not been involved in the stab

Method used

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  • Method for judging stability of goaf roof
  • Method for judging stability of goaf roof
  • Method for judging stability of goaf roof

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Experimental program
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Embodiment

[0033] Embodiment is specifically described as follows:

[0034] Step 1: Define the safety factor of goaf roof stability as the ratio of the actual shear strength to tensile strength of the roof overburden and the ratio of the critical failure shear strength to tensile strength after reduction; The ratio of the actual shear strength to the tensile strength of the rock is divided by the ratio of the shear strength to the tensile strength of the overlying rock at critical failure; according to the test results of the rock mechanics parameters in the laboratory test of the mine, refer to the "Engineering Rock Mass Classification Standard" (GB50218 -92) and "Code for Geotechnical Engineering Investigation" to determine rock mass engineering mechanical parameters density γ, elastic modulus E, cohesion c, friction angle Poisson's ratio μ, tensile strength σ b , the physical and mechanical parameters of the mine surrounding rock and ore body are as follows

[0035] surface;

[00...

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Abstract

The invention relates to a method for judging the stability of a goaf roof. The method comprises the following steps: defining the goaf overlaying stability safety factor as the ratio of the actual shear strength-tensile strength ratio of overlaying to the shear strength-tensile strength ratio of critical failure after reduction based on the concept of material strength reserve according to the physical and mechanical properties of rock; reducing the roof overburden cohesion, internal friction angle and tensile strength by use of an FLAC3D finite difference program, and determining the critical failure strength of the roof by adopting the central tension and plasticity zone connection of the goaf roof as a critical failure judging standard; and performing traversal search by a bisection method to obtain a safety factor conforming to the convergence condition to realize quantitative evaluation on whether the goaf roof is stable. The method provided by the invention provides guidance to safe mining of an underground mine and avoids the safety accidents in mine production such as casualties and equipment damage caused by settling and even collapse of unstable goaf roof during underground mining.

Description

technical field [0001] The invention relates to a technology for judging the safety of a goaf in a mine, in particular to a method for judging the stability of a roof in a goaf. Background technique [0002] The room-and-pillar open-spot mining method is a relatively common mining method adopted by metal mines in my country at present. It relies on the mutual bearing structure formed by the roof and the ore pillar to manage and control the ground pressure and realize the safe and efficient mining of ore. Roof stability is the basis for optimization of stope structural parameters in room-and-pillar mining. In the actual mining process of the mine, due to the dynamic interference of blasting vibration, groundwater and other factors, the mechanical parameters of the rock mass measured on site and in the room are not accurate enough. are greatly restricted. The numerical simulation method is widely used because it can better consider the anisotropy, heterogeneity, discontinuit...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 赵康张俊萍严雅静
Owner JIANGXI UNIV OF SCI & TECH
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