Study On Dynamic Disaster Monitoring And Identification Technology Of Borehole Multi-parameter Coal And Rock

Coal and rock dynamic disasters in coal mining seriously threaten mine safety production.With the increase of mining intensity and depth,the frequency of disasters has greatly increased.Because of the characteristics of sudden,transient and complex types of dynamic disasters,it is very difficult to predict and identify.At present,there are no accurate and effective methods to deal with this problem.In this paper,the experimental verification of drilling multi-parameter testing device developed by our research group is carried out,and the method of monitoring coal body stress with drilling multi-parameter index is put forward.By using analytic hierarchy process(AHP),the drilling parameters and gas outburst prediction index are combined to identify the composite disaster categories caused by rock burst,coal and gas outburst and their interaction.The research results can make up for the shortcomings of traditional drilling cuttings method,such as oneness and human interference,and are of great significance to improve the accuracy of disaster prediction and safe and efficient production of coal mines.In this paper,the relationship between drilling parameters and coal stress is studied by means of theoretical research,numerical simulation,laboratory and field test.The relationship between the simulation software simulation and the laboratory simulation experiment is studied.the results show that the coal body stress has a great influence on the thrust and torque of the drill pipe,and the changing trend of thrust and torque in the process of drilling coal and rock mass specimen with drill pipe is obtained,and the peak time period and the position of the peak value point are obtained by analyzing the data.There is a good correspondence between thrust,torque and drilling chip,which verifies the feasibility of monitoring coal stress by drilling multi-parameter index.The drilling multi-parameter testing device is used to test the underground raw coal,and the stress distribution is judged by collecting the drilling parameter data obtained from the test hole of the air roadway and the mining face at the test point.The results show that there is a good linear relationship between drill pipe torque and drilling chip amount,and the peak value appears at the drilling depth of 5 m.Due to the influence of coal and rock mass properties on the wave valley of drill pipe thrust in the stress concentration area,there is a peak thrust point,that is,the stress concentration precursor point,at the first 1m position from this area.By using the changing trend of these three parameters in the process of drilling coal and rock by drill pipe,the distribution of stress in this area can be judged,the stress concentration area can be divided,the test data of mining face are analyzed and the critical value of parameter index is defined byregression method,and the safe critical value of drilling parameters in this test point is obtained,so as to realize the effective monitoring of stress distribution in coal and rock.Predict the risk of dynamic disasters.The disaster evaluation index is determined by collecting the drilling parameters and gas parameters of the experimental point,and the disaster evaluation model based on multi-parameter index is established by using the analytic hierarchy process(AHP).The test point of the experimental mining area is selected as the calculation example,the data of each disaster index is collected,the weight ratio among the parameters of each index is analyzed and determined according to the disaster evaluation model,and the dynamic disaster types of coal and rock in this experimental point are identified.The paper has 66 figures,27 tables and 68 references.