A kind of coal mine covering rock break prediction experimental device

Abstract

The embodiment of the present invention discloses an experimental device for predicting fracture of coal mine overlying rock, including an experimental platform, a stress compensation system, a thermal infrared imaging system, an acoustic emission system, a hydraulic support load monitoring system, and a data information collection and processing system; the embodiment of the present invention By setting up the experimental platform, it is possible to monitor in real time the energy accumulation process of the roof during the advancing process of the working face, the energy distribution state when it breaks, the working resistance of the support, the stress change of the coal seam and the roof; through the data information acquisition system, the support load and coal , Stress change monitoring data in the rock formation; the above information is processed and compared by the data processing system, combined with the basic parameters such as the roof and floor lithology and the working state of the support to predict the precursor information of the overlying rock fracture, and obtain the mine pressure appearance of the working face and the overlying rock The law of movement provides an experimental basis for the control of surrounding rock in the stope.

Description

technical field [0001] The invention relates to the technical field of coal mine mining, in particular to an experimental device for predicting fracture of overlying rock in a coal mine. Background technique [0002] Rock is a heterogeneous composite structure material with random distribution of internal joints and fissures. When subjected to external action, the fissures inside the rock undergo closure, expansion and penetration processes. When the strength limit exceeds a certain limit, instability and failure will occur. In terms of fracture theory of coal seam overburden, there are mainly "masonry beam" theory, "transfer rock beam" theory, "pressure arch" hypothesis, "cantilever beam" hypothesis, "hinged rock beam" hypothesis, etc. The fracture and instability characteristics of the overlying strata are described, but the above ideas do not consider the impact of the energy accumulated in the deformation of the strata on the fracture of the strata. Solid yielding or de...

AI Technical Summary

Problems solved by technology

Many scholars have analyzed and given rock mass failure criteria and criteria from the perspective of energy, but they have not directly studied the energy accumulation and distribution characteristics during rock mass excavation.

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