Abstract
The ordovician limestone water inrush accident occurred during the excavation of 8228 working face in Tashan Coal Mine, Tongmei Group. On the basis of comprehensive geophysical exploration above and below the well, in order to find out the development boundary of the water flowing subsided column and the distribution characteristics of the broken body filled in it, and to control the subsided column by Grouting, the development boundary, the influence zone, the cementation of the fractured body and the distribution characteristics of the water flowing subsided column are found out by means of multi-layer and multi-branch surface directional horizontal drilling speed logging, drilling fluid leakage, cuttings logging and logging while drilling, and combined with data statistical analysis. The length and short axis of the collapse column is 410m - 200m, and the broken area is mainly distributed in the right front of the driving head of the belt roadway near the water inrush roadway. The 3d geological modeling of the spatial structure and development characteristics of the collapse column is carried out by using SURPAC software, and the main passageway area, fracture area and secondary fracture area are divided according to the crushing degree of the collapse column filling material. In view of the different zones of the collapse column broken body, the directional horizontal drilling control technology and the three-dimensional block grouting technology are used to construct the separate zones of the grouting technology. The safe mining of the working face is finally realized by the comprehensive treatment of cutting the source and reinforcing the water-flowing collapse column. The comprehensive exploration and treatment technology of directional horizontal drilling multi-branch collapse column provides a good reference for other similar projects.
Highlights
Karst water hazard is one of the main water hazards affecting the safety production of coal mines in China
According to the statistic data of Karst water-inrush accidents in China, 80% of the water-inrush accidents are structural water inrush, and most of them are water inrush from collapse column, for example, water inrush from the world's largest subsided column occurred in Fangezhuang Coal Mine of Kailuan Group in June 1984, water inrush from the subsided column occurred in Dongpang Mine of Xingtai in April 2003, water inrush from the subsided column occurred in Luoshan subsided column of Shenhua Group in March 2010, etc. .[1,2,3,4,5,6]
In order to find out the development boundary and filling characteristics of the water flowing collapse column in the working face, and to treat the collapse column by Grouting, the comprehensive exploration and treatment of the collapse column based on the technology of directional horizontal drilling on the ground were carried out in the mine[11-12]
Summary
In the second stage (1996-2006), the technology of "water plugging" in the collapse column is widely used, that is, building a certain length of "water plugging" in the pre-set layer of the water-inrush column, and cutting off the water inrush channel of the collapse column, such as the 7277 working face collapse column Treatment Project of Wanbei Renlou coal mine The disadvantage of this method is that it can not control drilling accurately, only "Serpentine" drilling can be used, and the engineering quantity is relatively large. The Directional Branch inclined hole "water plugging" construction technology is mostly used to detect and control the water hazard of many collapse columns This method has the advantages of small engineering amount, easy to put aggregate, and can be widely used in the stereoscopic detection of subsided columns. The prospecting and harnessing technology has a good reference to the structural prospecting and harnessing engineering under similar conditions
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