| The key to mine water prevention and control is to forecast the geological structure development and water bearing(conducting)situation in front of roadway under complex geological conditions.At present,the advanced detection technology applied to underground geological anomalies in coal mines mainly includes drilling and geophysical prospecting,in addition to geological theory prediction.It is the first choice and necessary work for mine exploration to use geological drilling rig to obtain core to analyze lithologic conditions and judge the geological conditions ahead.However,drilling is often only "one-hole-vision" and it is difficult to judge the surrounding conditions.Mine geophysical exploration has the advantages of close to the detection target,obvious geophysical anomaly,strong demonstration of exploration and mining comparison,and flexible application.However,the geophysical method is limited by the underground observation conditions and the influence of roadway environment,as well as the multi solution problem of the method itself,its detection accuracy needs to be further improved.Therefore,the study of drilling geophysical integration technology plays an important role in the safe driving of coal mine roadway.Therefore,this paper analyzes and summarizes the characteristics of drilling and geophysical exploration two advanced detection technologies,mainly studies the close combination of geophysical exploration technology and drilling construction technology,and uses drilling technology results to carry out fine interpretation of geophysical data,so as to realize the drilling materials in the process of roadway excavation Integrated exploration technology.The research contents and achievements of each part of the paper are as follows:(1)According to the characteristics of drilling and geophysical exploration,the implementation process of comprehensive geophysical exploration in three stages before,during and after drilling is designed to realize seamless and close connection between geophysical exploration and drilling work.(2)According to the technical characteristics of drilling geophysical integration,the seismic,electrical and transient data acquisition equipment is improved.In the drilling process,the seismic signal detection equipment while drilling is developed to collect the vibration signal in the drilling process,so as to extract the corresponding borehole lithology information.(3)The physical model tests of seismic,electrical,transient electromagnetic and seismic while drilling are carried out,and the feasibility and effectiveness of the integrated drilling geophysical exploration technology are further verified through the model tests.(4)The practical application and effectiveness of the integrated technology of drilling and geophysical exploration has been proved by the actual detection in a mine roadway and borehole.Combined with the detection signal and the image analysis of the visualizer,the relationship between the response signal and the lithology change and the degree of lithology fracture is obtained.Therefore,the technology can make full use of the technical advantages of drilling and geophysical exploration to obtain more abundant geological data.This paper contains 54 figures,4 tables and 112 references. |
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