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Vol.3 , No. 5, Publication Date: Aug. 12, 2016, Page: 108-124
 in North China Type coal Field (hereafter, NCTC for short) in China, Chinese scientific and technical workers did a lot of research work in theories and methods on water-inrush risk evaluation and grouting reinforcement technique for the coal seam floor, they have achieved fruitful research results. This paper firstly made a systematical introduction of the history and present situation of theories and methods on water-inrush risk evaluation and grouting reinforcement technique for coal seam floor in China, and elaborated the main contents of water-inrush coefficient method, theory of original position tension crack and the zero position failure, the theory of strong infiltrating channel, etc, respectively; secondly, it introduced the development course of boreholes layout for large-area grouting reconstruction of the aquifer in coal bed floor, which has progressed from fan-shaped boreholes opening in underground roadway, directional boreholes opening in underground roadway, to directional boreholes opening on the surface; thirdly, it introduced the application status of geophysical techniques (such as electronic resistivity CT method, detection layer with seismic wave, radio wave penetration tomography, transient electromagnetic, and so on) in exploring the effect of large-area grouting reconstruction of the floor of LGCS; fourthly, it pointed out that, based on further study of the mechanism of water-inrush from coal seam floor, studying the interaction between grout and floor strata of LGCS, using the way of directional borehole opening on the surface to grouting reconstruction of the floor strata of LGCS, and adopting the comprehensive geophysical techniques to detect and evaluate the water inrush risk of LGCS floor before and after grouting reconstruction will be the development trends of water prevention and control in LGCS floor in the future.&picture=http://www.aascit.org/aascit/decorators/img/journal/902.jpg)
| [1] | Wang Hua, Institute of Mine Construction, Tiandi Science and Technology Co., Ltd., Beijing, China; Beijing China Coal Mine Construction Engineering Co., Ltd., Beijing, China; National Engineering Laboratory for Deep Shaft Construction Technology in Coal Mine, Beijing, China. |
In view of frequent accidents of water inrush from the floor of Lower Group Coal Seam (hereafter, LGCS for short) in North China Type coal Field (hereafter, NCTC for short) in China, Chinese scientific and technical workers did a lot of research work in theories and methods on water-inrush risk evaluation and grouting reinforcement technique for the coal seam floor, they have achieved fruitful research results. This paper firstly made a systematical introduction of the history and present situation of theories and methods on water-inrush risk evaluation and grouting reinforcement technique for coal seam floor in China, and elaborated the main contents of water-inrush coefficient method, theory of original position tension crack and the zero position failure, the theory of strong infiltrating channel, etc, respectively; secondly, it introduced the development course of boreholes layout for large-area grouting reconstruction of the aquifer in coal bed floor, which has progressed from fan-shaped boreholes opening in underground roadway, directional boreholes opening in underground roadway, to directional boreholes opening on the surface; thirdly, it introduced the application status of geophysical techniques (such as electronic resistivity CT method, detection layer with seismic wave, radio wave penetration tomography, transient electromagnetic, and so on) in exploring the effect of large-area grouting reconstruction of the floor of LGCS; fourthly, it pointed out that, based on further study of the mechanism of water-inrush from coal seam floor, studying the interaction between grout and floor strata of LGCS, using the way of directional borehole opening on the surface to grouting reconstruction of the floor strata of LGCS, and adopting the comprehensive geophysical techniques to detect and evaluate the water inrush risk of LGCS floor before and after grouting reconstruction will be the development trends of water prevention and control in LGCS floor in the future.
Keywords
Northern China Typed Coalfield, Lower Group Coal Seam, Water Prevention and Control Technology, Development Trend, Confined Water of Ordovician Limestone, Pre-grouting, Directional Borehole
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