Comprehensive Geophysical Detection of Rock Stratum Failure at Roof and Floor on Coal Faces

摘要

Precise measurement of roof water-conducting crack zone height and floor failure zone depth at coal face is highly significant for water disaster prevention of coal mine. The basic principle of the comprehensive geophysical detection methods (rock acoustic detection, borehole ultrasonic imaging, holes perspective of radio waves) are introduced. The failure laws for rock stratum at roof and floor on coal face, and the fundamentals for comprehensive geophysical detection methods including rock acoustic detection, borehole ultrasonic imaging and inter-pore radio wave penetration, were introduced in this paper. The in-site measurement results indicated that the rock failure states determined by comprehensive geophysical detection methods can not only precisely measure the haplopore detection microscopically, but also realize the macroscopic control survey for inter-pore detection. Thus, the accuracy of detection was significantly improved, which proved that the comprehensive geophysical detection methods were effective for measuring the height of rock-covering water-conducting crack zone at coal face and the depth of floor failure zone.