Geological structures fine monitoring using Seismic-while-tunneling technique in Wangpo Mine
ZHAO Huibo;QIN Si;CHEN Chao;GUAN Qi;ZHAO Xingwei;CHE Jianhang
【Objective】Traditional coalmine tunnel seismic advance detection technology is limited by factors such as the use of explosives, mining stoppage requirements, prediction speed, detection range, and capabilities, making it difficult to meet the high-precision geophysical exploration needs of intelligent tunnel excavation faces. Method】Seismic-while-tunneling monitoring uses the vibration of the roadheader cutting the coal wall as the seismic source and adopts a working mode of real-time data upload, automatic processing, and dynamic imaging. It fully utilizes information technology and software technology, significantly enhancing the imaging precision of geological anomalies ahead of the mining face through real-time continuous super-saturation stacking supported by massive data. Taking Wangpo Coal Mine in Shanxi as the research object, a seismic-while-tunneling monitoring system was deployed in two driving tunnels to conduct detailed exploration of geological structures. 【Results and Conclusion】In practical operations, data accumulated within 48 hours after monitoring operations can image geological anomalies within a 200 m range ahead of the mining face. In the return airway of the 3217 working face, a reflected anomaly of a squeezing gangue zone 97 m ahead of the mining face was successfully detected with a prediction error of 1m; in the transport tunnel of the 3303 working face, a collapse pillar 39 m ahead of the mining face was identified with a prediction error of 2 m; in the same transport tunnel of the 3303 working face, two abnormal areas of fractured coal zones were detected. One located 148 m ahead of the mining face had a prediction error of 1 m, while the other located beyond 211 m ahead, despite being obstructed by a collapse pillars and a fractured coal zone, still produced relatively strong imaging results with a prediction error of 3 m. This indicates that the detection capabilities of seismic-while-tunneling monitoring during mining can provide technical support for the prevention of gas disasters. The application results demonstrate that this technology is convenient for construction operations, with high detection accuracy, long detection distance, and strong detection capability, providing reliable geological support for intelligent and safe tunnel excavation in coal mines.
advance roadway exploration;seismic-while-tunneling;geological structures;fractured coal zones;a squeezing gangue zone;a collapse pillar
主办单位:煤炭科学研究总院有限公司 中国煤炭学会学术期刊工作委员会