Device and method for detecting coal seam gas pressure and coal wall stress

Abstract

The invention relates to a device and a method for detecting coal seam gas pressure and coal wall stress. The detection device comprises a pressure detector and a stress detector which penetrate the rock layer to be positioned in a drilled hole on a coal wall and an analog-to-digital converter, a monolithic processor and a display which are arranged outside the drilled hole on the coal wall, and the detection method comprises the following steps: a hole is drilled on a coal seam, the pressure detector and the stress detector are transported inside the drilled hole and respectively used for detecting the gas pressure inside the coal seam and the coal wall stress, wherein, the pressure detector transforms the detected information into a standard current signal, the stress detector transforms the detected information into a voltage signal for amplification, and the current signal and the voltage signal are transmitted to the outside of the drilled hole through wires, and are transformed into digital signals through the analog-to-digital converter; and after program operation and processing of the monolithic processor, the numerical values of the coal seam gas pressure and the coal wall stress can be displayed on the display screen. Therefore, not only the measurement time of the coal seam gas pressure can be greatly shortened, but also the technical requirements for hole sealing are lowered, and the cost is saved.

Description

technical field [0001] The invention relates to a detection device and method for coal seam gas pressure and coal wall stress, and is especially suitable for detection of basic parameters such as underground gas reserves, gas drainage, gas gushing and gas outburst in coal mines. Background technique [0002] Research and evaluation of coal mine gas control issues such as gas reserves, gas drainage, gas gushing, and gas outburst have been a major problem in this technical field for many years, and obtaining coal seam gas pressure and coal wall stress is the key to solving the above problems , so how to accurately and quickly measure coal seam gas pressure and coal wall stress is of great significance. At present, the existing method of detecting coal seam gas pressure is only the measurement method of the pressure gauge. The main method is to use a metal air pipe to guide the gas in the coal seam to the outside of the coal seam drilling. After the hole is sealed, the pressure...

AI Technical Summary

Problems solved by technology

At present, the existing method of detecting coal seam gas pressure is only the measurement method of the pressure gauge. The main method is to use a metal air pipe to guide the gas in the coal seam to the outside of the coal seam drilling. After the hole is sealed, the pressure gauge is connected to the air pipe to measure the pressure. Measurement, although this technology can detect the coal seam gas pressure on the coal wall, but due to the poor connection of the air guide pipe, it will cause gas leakage, which requires high technology for sealing the hole, and the operation of changing the meter is required. The construction is difficult and costly, and the pressure recovery It takes a long time to perform rapid detection, and there is currently no method to test the stress of the coal wall

Images