Application of off-line simultaneous excavation seism in fault detection
Yue Bo1, Yang Yanjun2, Zhang Yunning1, Wang Zichen2
1. Shandong Coal Science and Technology Research Institute Branch, Yankuang Energy Group Co., Ltd., Jinan 250000，China；2. Xi 'an Research Institute Co., Ltd., China Coal Technology & Engineering Group, Xi 'an 710077, China
Abstract： Three-dimensional seismic results showed that a fault with a maximum drop of 270 m was developed in front of the 103 lower 03 rubber haulage roadway in Jining No.2 coal mine. The existence of the fault not only destroyed the integrity of the aquifuge, but also shortened the distance between the footwall working face and the upper Ordovician limestone aquifer, which improved the risk of using underground drilling to find out the location of the fault. In view of this situation, under the condition that the detection target was clear and the target geological body was within the detection distance, this paper explored the use of YTZ3 ( B ) seismograph to carry out ' off-line ' simultaneous excavation seismic detection of Balipu fault location and extension characteristics in No.103 lower 03 face. The test results showed that the fault boundary comprehensively interpreted by the ' off-line ' simultaneous excavation seismic and three-dimensional seismic was basically the same. The two detection methods confirmed each other, which improved the detection accuracy of the fault boundary position. The study also showed that the technology could provide scientific guidance for the prediction of geological structure in front of roadway excavation.
