A method for identification of dangerous pillars in goaf

Abstract

The invention discloses a method for identifying dangerous ore pillars in goafs. For any ore pillar i in the ore pillar group, assuming that it is unstable, the risk value of the instability is calculated according to the following steps; Step 1: the instability The pillar is removed from the pillar group, and its load is distributed to the remaining pillars in the pillar group; for each remaining pillar in the pillar group, its load and safety factor are updated; Step 2: If the remaining If there are pillars with a safety factor lower than the critical value in the pillar group, and the sum of the bearing areas of all the pillars in the remaining pillar group is greater than the critical pillar bearing area of ​​the roof instability, then any remaining pillars in the pillar group A pillar whose safety factor is lower than the critical value is used as a new unstable pillar, and returns to step 1; otherwise, step 3 is performed; step 3: from the instability probability of pillar i and the remaining ore in the pillar group after its instability, The loss of the bearing area of ​​the pillar can be used to obtain its instability risk value; the pillar with a large instability risk value is a dangerous pillar. The invention can realize the identification of dangerous pillars in the goaf.

Description

technical field [0001] The invention belongs to the technical field of early warning of underground mine disasters, and in particular relates to a method for identifying dangerous pillars in goafs. Background technique [0002] As the lifeblood of national economic development, the mining industry has left an astonishing number of underground goafs with the extraction of a large amount of ore. The State Council issued a document in 2016 requiring metal and non-metal mines across the country to complete the investigation and treatment of hidden dangers in the remaining gobs by the end of 2018. In order to ensure the stability of the overlying strata while mining ore, ore pillars are usually left as permanent or temporary support. Different from the civil structures with regular shapes on the ground, the size of the underground mine pillars varies greatly, the mechanical parameters of the rock mass are distributed unevenly, and the strength deteriorates significantly after be...

AI Technical Summary

Problems solved by technology

However, most of the goaf pillars have strong heterogeneity, and the size of the pillars is greatly different due to the impact of the mining process, resulting in the bearing capacity of the pillar group is far lower than the sum of the strength of a single pillar

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