Drilling measuring system and method for detecting height of water flowing fracture zone through water pressure

Abstract

The invention discloses a drilling measuring system and method for detecting the height of a water flowing fracture zone through the water pressure. According to the drilling measuring system and method, a drill bit body is drilled into a down-hole roadway through a drilling measuring mechanism to conduct drilling till a hole exceeds the highest position where the water flowing fracture zone is located, after drilling is completed, a drill is withdrawn, in the drill withdrawing process, the height of the water flowing fracture zone is detected, measuring is conducted every time a water injection drill rod is withdrawn by the unit length, according to the change of water level elevation values obtained by a drilling measuring drill bit at different measuring point positions in the hole, therange of the water flowing fracture zone is judged, and the water flowing fracture zone is a zone with the water level elevation values changing along with the depth of the measuring point positionsin the hole. Drill withdrawing and detection are conducted synchronously, the labor amount is reduced, the labor intensity of a worker is lowered, and the detecting efficiency is improved; and the drilling measuring system and method are suitable for detection of the fracture development law of overburden strata with the medium hardness or above, and the good detection effect can still be achievedunder the condition that weak overburden strata or faults are more prone to hole collapse compared with developing zones and the like.

Description

technical field [0001] The invention relates to the technical field of detecting the development law of overlying rock fissures in underground coal mines, in particular to a drilling and measuring system for detecting the height of a water-conducting fissure zone through hydraulic pressure. Background technique [0002] In coal mining, with the push of the working face, the stress field in the stope is redistributed, and the overlying rock formations are cracked and damaged to varying degrees. Once the cracks are penetrated and spread to the aquifer, a water inrush channel will be formed. Therefore, knowing the shape and evolution process of the cracks in the roof strata and determining the height of the water-conducting cracks in the working face can not only ensure the safe production of coal mining under the water body, but also help to control the damage of the roof during coal seam mining. Reasonable determination of working face and roadway support parameters also play...

AI Technical Summary

Problems solved by technology

Although this method is more intuitive than the former, the amount of drilling is relatively large, especially for deep mines, and the monitoring range is also limited. In addition, when determining mining fractures, it is also affected by primary fractures and structures.

[0005] In the prior art, it is necessary to excavate the borehole in advance during the detection process, and then carry out detection. During the period between drilling withdrawal and detection, the cracks in the borehole are likely to continue to develop, and the boreholes in the fracture zone It is easy to collapse the hole and make the follow-up detection work impossible, making the drilling useless and causing the loss of manpower and material resources. Therefore, we propose a drilling and measuring system that detects the height of the water-conducting fracture zone through hydraulic pressure to solve the above problems

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