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Internal thermal origin mechanism of Karstic collapse column with no smoothly extrinsic cycle

Journal of Coal Science & Engineering(China) 2008年第2期14卷 230-234页

作者：李永军彭苏萍李佩全刘登宪连会青 North China Institute of Science and Technology Beijing 101601China State Key Laboratory of Coal Resources and Safe Mining China University of Mining and Technology(Beijing)Beijing 100083China Huainan Mining Group Co. Ltd.Huainan 232001China

Huainan coal field as main object,investigation of Karstic hydrogeological con- ditions were developed in Huainan structureal unit,and the basic conditions,features and rules of Karstic growth were *** background and causes of Karstic col- lapse columns were *** with ancient physiognomy,environment and li- tho-facies *** studying synthetically Karstic collapse columns,shape of col- lapse body,filling feature,hydrodynamic condition and agglutinate material in Huainan area,considering mine hydrogeological conditions of Xuhuai coal field and referenced Karstic collapse columns characters of other mines in North China,the internal thermal origin theory is elementarily formed for Karstic collapse columns extrinsic cycle can not operate ***,three aspects including distributing features of different kinds of Karstic collapse columns in north China type coal field,conditions of Karstic collapse col- umns origined from internal thermal with no smoothly extrinsic cycle,mechanics of causes were analyzed and demonstrated.

关键词： collapse column mine water disaster Huainan mine North China coal field Karst

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Study on Wave Field Characteristics and Imaging of collapse column in Three-Dimensional Detection with Love Channel Wave Reflected outside the Working Face

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Open Journal of Geology 2020年第11期10卷 1027-1039页

作者： Huachao Sun Huide Zhang Jinyun Wang Xianzhuang Lv Xin Ding Shiyu Xing Heng Zhang China University of Mining and Technology School of Resources and Geophysics Xuzhou China Shang Dong Energy Linyi Group Luxi Coalmine Jining China Kaijia Group Yitang Changyuan Coalmine Jiexiu China China University of Mining and Technology School of Mechanics and Civil Engineering Xuzhou China

The safety accidents caused by collapse column water diversion occur frequently, which has great hidden danger to the safety production of coal mine. Limited by the space of underground, the detection of collapse column on the outside of working face has been a difficult problem. Based on this, numerical simulation and imaging research were carried out in this paper. The results indicate that when a seismic source near the roadway is excited, a part of seismic wave propagates along the roadway direction, namely direct P-wave, direct S-wave and direct Love channel wave. When the body waves and Love channel wave propagating to the outside of working face meet the interface of collapse column, the reflected Love channel wave and reflected body waves are generated. Reflection body waves and direct waves are mixed in time domain, which is difficult to identify in seismic records, while reflected Love channel wave whose amplitude is relatively strong. The reflected Love channel wave which has a large interval from other wave trains in the time domain is easily recognizable in seismic record, which makes it suitable for advanced detection of collapse column. The signal-to-noise ratio of X component is higher than that of Y component and Z component. According to the seismic records, polarization filtering was carried out to enhance the effective wave, which removed the interference waves, and the signal was migra

关键词： Reflected Love Channel Wave 3D Numerical Simulation collapse column Wave Field Characteristics Migration Imaging

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