Mine mining fracture evolution and distribution monitoring device and method

Abstract

The invention discloses a device and method for monitoring the evolution and distribution of a mining-induced fracture. Generation, evolution and distribution of the mining-induced fracture are monitored through a method of monitoring acoustic wave or vibration generated in fracture of coal or rock. The device mainly comprises an anti-explosion acoustic wave monitor, an anti-explosion power source and a ground monitoring analysis center, wherein the anti-explosion acoustic wave monitor consists of a sonic sensor and a signal conversion and data acquisition instrument; the sonic sensor is arranged on a roadway base plate, an anchor rod tail end or a drill hole; and an acoustic wave or vibration signal monitored by the sonic sensor is collected and processed by the signal conversion and data collection instrument, and is transmitted to the ground monitoring analysis center through an optical fiber port to be subjected to processing, positioning and quantitative analyzing and be labeled on a plane, a cross section or a space diagram according to the position and size, so as to show the position and size of the fracture. The device and method provided by the invention has the beneficial effects of large monitoring range, a large amount of comprehensive monitoring information, high automation degree, strong instantaneity and capability of being applied to monitoring and forecastingthe coal rock dynamic disasters, such as rock burst, and outburst and water burst of coal and gas and the like.

Description

technical field [0001] The invention relates to a monitoring device and method, in particular to a monitoring device and method for monitoring the evolution and distribution of mining cracks by monitoring sound waves or vibrations generated by coal rock rupture, and belongs to the technical field of mine pressure and safety. It can also be applied to the monitoring and forecasting of coal and rock dynamic disasters such as rockburst (rock burst), coal and gas outburst, and water inrush. Background technique [0002] The mine rock mass is in the state of original stress balance under natural conditions. The excavation activities in underground mines cause the redistribution of stress field and the activities of surrounding rocks, including the deformation of surrounding rocks and the generation of mining cracks. The generation of mining fissures is the fracture behavior that occurs after the stress of the surrounding rock exceeds the ultimate stress that it can bear. In the...

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Problems solved by technology

It should be pointed out that the above methods are all carried out in a single borehole, because the deformation and damage of the overburden and floor strata caused by coal seam mining are dynamic and temporal, that is, the fracture network changes with time as the mining activities proceed. and spatial dynamic changes, so the detection effect through a single borehole can only reflect the development of cracks in the local area of ​​the hole wall, and the detection results only reflect the cracks during the drilling period, which is a static observation

In the case of a limited number of drill holes, the detection results cannot fully reflect the occurrence and distribution of coal and rock mass fissures in the comparative space, let alone reflect the evolution of coal and rock mass mining cracks over time and space in a timely manner, which cannot meet the needs of mines. the actual needs of

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