Metal mine goaf overlying strata instability and catastrophe discrimination method under cemented mine pillar support

Abstract

The invention discloses a metal mine goaf overlying strata instability and catastrophe discrimination method under cemented mine pillar support which comprises the following steps of firstly, establishing a goaf overlying strata space stress model, and calculating various stress components under the effects of the gravity and the beam supporting force only; calculating various stress components when a construction stress is acted on overlying strata only; calculating various stress components when a mine pillar adopts a cemented mine pillar; establishing a catastrophe model of overlying stratainstability and failure under manual mine pillar support according to a catastrophe theory; and performing cusp catastrophe analysis to obtain an overlying strata stability criterion. The metal minegoaf overlying strata instability and catastrophe discrimination method under cemented mine pillar support can obtain a quantitative relation of damages of the overlying strata by mining a metal mineunder cemented mine pillar support, a span of a goaf and a mining depth to the stability of a top plate of the goaf so as to obtain a quantitative relation of overlying strata damages as well as a mining span and a mining depth of the goaf and provides a basis to design of deep mining parameters of the metal mine.

Description

technical field [0001] The invention belongs to the technical field of mining safety prevention and control in metal mines, and specifically relates to a method for discriminating sudden changes in overburden rock instability in goafs of metal mines under the support of cemented ore pillars. Parameter design provides a reference basis. Background technique [0002] The sudden large-area roof caving in the goaf belongs to the problem of sudden dynamic instability of the rock mass system. The breeding stage of the sudden dynamic instability disaster of the rock mass system is quasi-static, but its occurrence is dynamic, accompanied by A large amount of elastic energy is released, resulting in dynamic fracture of the rock mass and vibration of the surrounding rock, which is a complex behavior in a highly nonlinear state. After the instability, the system is in a new stable state. In recent years, the catastrophe theory has been used to study the sudden change of the system sta...

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Problems solved by technology

[0010] The geological structure and ore body shape of metal mines are different from layered coal mines. Due to the complex burial conditions of metal mines, gravity and tectonic stress have become important factors in the mining process. Structural stress is rarely considered as an important factor in mechanical models

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