Roof hydraulic fracturing multi-parameter integrated monitoring system and fracturing effect determination method

Abstract

The invention provides a roof hydraulic fracturing multi-parameter integrated monitoring system and a fracturing effect determination method, and relates to the technical field of mining engineering.The roof hydraulic fracturing multi-parameter integrated monitoring system and the fracturing effect determination method solve the technical problems of observing the hydraulic fracturing effect of aroof and determining the fracturing range. Monitoring equipment includes a borehole stress gauge, anchor bolt and cable dynamometers, a borehole peeping instrument, roof monitors, support resistanceobservation stations, a microseisms observation station and a surrounding rock deformation observation station. The borehole stress gauge is disposed in a mining roadway, and the anchor bolt and cabledynamometers are disposed within a range of 10m around a hydraulic fracturing position. The borehole peeping instrument includes a peeping probe, a data acquisition device, a displacement sensor, a coil and an extension rod. The borehole fissure development state, roadway deformation displacement, microseisms events, support resistance and roadway surrounding rock stress changes in the range of hydraulic fracturing before and after hydraulic fracturing are monitored to judge the hydraulic fracturing effect and fracturing range, the reliability of multi-parameter integrated monitoring is high,the hydraulic fracturing effect is judged accurately, and roof dynamic disasters can further be avoided to ensure the safety of mining.

Description

technical field [0001] The invention relates to the technical field of mining engineering, in particular to a multi-parameter comprehensive monitoring system for roof hydraulic fracturing and a method for judging the effect of hydraulic fracturing. Background technique [0002] With the gradual development of coal mines in my country, the intensity and frequency of coal mine roof dynamic disasters have increased significantly due to the complexity of the deep mechanical environment and changes in the mechanical properties of coal and rock. According to statistics, among all kinds of accidents in coal mines, the number of roof accidents and the number of deaths account for a large proportion, which is the key prevention and control object in coal mine accidents. With the increase of the scope of the underground stope, if the hard roof above the coal seam cannot collapse in time with the advancement of the working face, it will overhang the roof strata behind the working face ...

AI Technical Summary

Problems solved by technology

Among them, the roof deep hole pressure relief blasting technology can only be used in low gas areas, and there are constraints such as the difficulty of deep hole charging and sealing, and the difficulty of handling blind blasting; while the roof hydraulic fracturing technology has its on-site construction design. Parameters can be obtained through numerical simulation and theoretical calculation, but it is difficult to obtain pressure parameters such as crack growth and stress transfer law of fracturing, so the evaluation of pressure relief effect of roof hydraulic fracturing cannot be carried out.

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