The Height of Water-Conducting Fractured Zones in Longwall Mining of Shallow Coal Seams

被引：52

作者：

Liu X. ^{[1
]}

Tan Y. ^{[1
]}

Ning J. ^{[1
]}

Tian C. ^{[1
]}

Wang J. ^{[1
]}

机构：

[1] State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao

来源：

Geotechnical and Geological Engineering | 2015年 / 33卷 / 3期

基金：

中国国家自然科学基金;

关键词：

FLAC3D; Protective layer; Shallow coal seam; Water-conducting fractured zone;

D O I：

10.1007/s10706-015-9851-2

中图分类号：

学科分类号：

摘要：

The height of the water-conducting fractured zone is of significant importance for both the prevention of water inrush induced disasters and the design of longwall mines. To ensure the mining safety of shallow coal seams under water-rich aquifers, an approach for forecasting the height of the water-conducting fractured zone is proposed by analyzing the damage zone distribution in FLAC3D model. First, 30 numerical models with different face lengths and mining thicknesses of no. 1101 coal face at Luxin Mine, China, a typical shallow coal face, were built using FLAC3D. Then, the heights of water-conducting fractured zones and the thicknesses of protective layers with different face lengths and mining thicknesses were obtained from numerical simulations and empirical formulae. Results show that the height of the water-conducting fractured zone increases with both the face length and mining thickness. And there is a critical value of face length, which is about 300 m in no. 11 coal seam at Luxin Mine. To mine no. 11 coal seam, a slicing mining method is suggested and the face length and mining thickness of the first slice are recommended as 200 and 3.0 m, respectively. © 2015, Springer International Publishing Switzerland.

引用

页码：693 / 700

页数：7

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