Real-time Monitoring Multi-Parameters For Gas Bearing Coal Seam And Its Application

Gas disaster threatens miners' life safety and sustainable development of the country. The real-time monitor of multi-parameters, such as gas, stress and temperature et al, is of great interest for prevention and control of gas disaster. The model of gas seepage by layer is established in this paper and the impact mechanism of coal seam stress filed on coal seam gas seepage and its preservation characteristic is analyzed on the perspective of starting pressure gradient of gas seepage in low speed. The technology of real-time monitor multi-parameters of gas-bearing coal is put forward, and the system of real-time monitor containing multi-parameters of gas-bearing coal is established. The method of real-time monitor multi-parameters of gas-bearing coal in evolution of coal and rock dynamic disaster is proposed, meanwhile, the parametric testing of coal seam gas and real-time monitor method about effect of gas control are proposed and used.The model of gas seepage by layer is established in this paper and the impact mechanism of coal seam stress filed on coal seam gas seepage and its preservation characteristic is analyzed on the perspective of starting pressure gradient of gas seepage in low speed. The thermodynamic effect of coal seam gas flow field is elaborated. And the change mechanism of temperature field of coal seam gas is analyzed respectively with thermal gradient of gas seepage and thermal energy transformation caused by changes of stress.A new method of sealing monitoring borehole is proposed, that is using high pressure capsule company sealing capsule or other sealing craft to seal the borehole. The high pressure capsule can also monitor stress, thus realizes the monitoring of many parameters including gas, stress and temperature. The method of locating sealing borehole in this coal seam using EMR based on electro-stress couple mechanism was proposed.Real-time monitoring system is built up to monitor parameters in coal seam with gas, this system mainly includes four parts:borehole sealing device, stress monitoring device, data collecting device and application software system. The system not only can monitor relevant parameters like gas, tress and temperature synchronously, but also could transmit, storage and process the data synchronously with the help of KJ system.The index of real-time monitoring of the multi-parameter gas coal, which include gas pressure, environment temperature of borehole, stress of coal around borehole et al, are introduced.The method of real-time monitor multi-parameters of coal seam in evolution process of coal or rock dynamic disaster is put forward. That is through constructing borehole of monitoring in working face and installing monitoring system to monitor the multi-parameter coal seam with gas in synchronous and real-time. The determination formula about the space between monitoring sites and monitoring borehole is obtained. And this method is tested in LiangBei coal mine. Based on safety rheology and mutation theory and combined with each parameter variation of coal seam around measures of relief boreholes, the characteristics of safety rheology and mutation in relief and drainage measures are analyzed during mining process.The method of real-time monitor about parametric testing of coal seam gas and effect of gas prevention and cure is proposed, and has been applied in coal mine respectively.The paper has81pieces of Figures,9pieces of tables,159pieces of references.