Monitoring method for remotely measuring and controlling damage depths of floor strata

Abstract

The invention relates to a monitoring method for remotely measuring and controlling damage depths of floor strata. The monitoring method is characterized in that vibrating wire type rock fracture meters and temperature sensors are arranged in drilled holes of a seam floor stratum, and a monitoring system comprises a signal acquisition unit, signal transmission cables and a reading device; and the signal acquisition unit acquires displacement and temperature data of fractures at measuring points of the floor stratum, the displacement and temperature data are transmitted to the reading device via the signal transmission cables, analog quantities are converted into digital quantities on the reading device, and the digital quantities are recorded and displayed. The monitoring method has the advantages that damage conditions of the measuring points of the floor stratum of a stope can be monitored before a roof propelled along with a working face in a mining procedure falls, damage conditions of the measuring points of the floor stratum can also be monitored after the working face is pushed across a monitoring point and the roof falls, and accordingly the integral mining procedure is continuously monitored; and the maximum damage depth and an activity low of the floor stratum of the working face can be obtained by analyzing the monitoring data, and a foundation is laid for predicting water inrush of a seam floor.

Description

technical field [0001] The invention relates to a method for monitoring the damage depth of a floor rock stratum by remote measurement and control, and belongs to the field of mine mining and disaster monitoring methods. technical background [0002] During coal mining, if there are underground rivers, karst caves or highly confined water under the floor strata, the confined water of the floor will break into the mining work space, resulting in the risk of mine water hazard accidents. direct relation. [0003] At present, there are mainly two commonly used on-site monitoring methods for the failure depth of the floor rock formation at home and abroad, namely the water injection test method and the acoustic wave detection method. [0004] According to the water injection test method, there is a direct relationship between the development of cracks in the rock mass of the floor and the amount of water injection. A large amount of water injection reflects the development of cr...

AI Technical Summary

Problems solved by technology

The water injection test is simple, intuitive, and widely used, but the hydrophilicity of the rock mass is different, and it is affected by the pores in the rock mass, so the measurement error is large

The sonic detection method cannot distinguish the original cracks in the floor strata from the new cracks formed by mining, and the measurement error is large

In addition, both of the above two methods can only monitor the damage status of the measuring point of the stope floor strata before the roof is stepped down as the working face is pushed forward during the mining process. It cannot be measured, and cannot reflect the development and evolution of the rock formation failure at the bottom plate measurement point during the entire advancement process of the working face

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