Overview of goaf water hazards control in China coalmines
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ORIGINAL PAPER
Overview of goaf water hazards control in China coalmines Herong Gui 1,2 & Huili Qiu 1,2 & Weizhong Qiu 3 & Shijie Tong 4 & Hongzhong Zhang 4 Received: 29 July 2017 / Accepted: 8 January 2018 # Saudi Society for Geosciences 2018
Abstract Since 1990s, goaf water has become a frequent cause of water disaster in China coalmines, inflicting severe human casualties and huge economic losses. Based on the analysis of the goaf water disaster cases in China coalmines, this article put forward the theoretical and technological system of goaf water control, which include (1) the area and volume of goaf water are reasonably determined due to existence form of goaf water and geophysical prospecting results, (2)retaining sufficient water-resistant coal (rock) pillar to prevent goaf water inrush from adjacent and above, (3)grouting insecure or failure water-resistant coal (rock) pillar, and (4) draining goaf water using Bfanned-out^ normal drill and long-distance directional drill, and of all, draining goaf water through long-distance drill has been proved to be technically superior in engineering practices. The research results can be of reference to other coal-producing countries in similar geological conditions. Keywords Goaf water . Water-resistant coal (rock) pillar . Grouting reinforcing . Prospecting and draining . China
Introduction Since 1879, the Qing Dynasty founded Zhongxing Mining Bureau in Zaozhuang of Shandong and developed Taozao coalmine, coalmining in China has been through nearly 140 years. After the founding of the New China in 1949, nationwide construction spurred the demand for coal and the exploitation of coal resources. Currently, coal production in China is taking up almost half of world total production (Gui et al. 2016). In China coalmines, the void left behind from old abandoned coalmines are called Bgoaf zone,^ where underground water accumulates and becomes Bgoaf water.^ The spatial relations between goaf water and mining panel are of three
* Herong Gui [email protected] 1
National Engineering Research Center of Coal Mine Water Hazard Controlling (Suzhou University), Suzhou, Anhui 234000, China
2
School of Earth and Environment, Anhui University of Science and Technology, Huainan, Anhui 232000, China
3
No.115 Prospecting Institute of Coal Geology of Shanxi Province, Datong, Shanxi 037000, China
4
Wanbei Coal-Electricity Group Co. Ltd, Suzhou, Anhui 234000, China
types. Firstly, adjacent relation in which the mining and planned mining panels are on the same near-horizontal seam (inclination less than 10°) while the goaf water is on the left or right side of the mining panel (as in Fig. 5). Secondly, diagonal above relation in which mining and planned mining panels are on the same inclined seam while the goaf water is on diagonal above of the mining panel (as in Fig. 6). Thirdly, superjacent relation in which the mining and planned mining panels are on different seams while goaf water is superjacent to the mining panels (as in Fig. 8). By chronological division, there are two
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