Study on the mechanism of confined water mining lifting in coal seam floor with a hidden fault

被引：0
|
作者：
Zhang Y. [1 ,2 ,3 ]
Zhang Z. [1 ,2 ]
Li Y. [4 ]
机构：
[1] CCTEG Coal Mining Research Institute, Beijing
[2] Coal Mining and Designing Department, Tiandi Science and Technology Co Ltd, Beijing
[3] State Key Laboratory of Coal Mining and Clean Utilization, Beijing
[4] China Coal Research Institute, Beijing
来源：
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | 2023年 / 40卷 / 01期
关键词：
floor hidden fault; floor stress field; lifting height of confined water; mechanical analysis;
D O I：
10.13545/j.cnki.jmse.2021.0501
中图分类号：
学科分类号：
摘要：
According to the hydraulic mechanics of fractured rock mass, the variation law of water pressure and lifting position in the process of confined water lifting was analyzed, and the mathematical relationship between them was deduced. By analyzing the spatial distribution law of floor mining-induced stress field, the mechanical model of floor confined water with hidden fault was constructed, and the expression of stress transfer law of mining influence in floor space was deduced based on semi-infinite body theory. What's more, the formulas for calculating the critical water pressure and the lifting height of confined water for fracture propagation under the combined action of mine pressure and water pressure were deduced based on the theory of fracture mechanics. The influencing factors were analyzed by single factor analysis method, and the influence of hidden fault dip on the mining lifting rule of confined water was simulated by FLAC3D. The results have shown that the lifting height of confined water increased with the increase of initial water pressure and hidden fault dip, while decreased with the increase of dynamic water velocity and fracture toughness of rock mass. The lifting height of mining-induced confined water was also related to its energy loss coefficients, mechanical properties of structural rock mass and original in-situ stress during the lifting process. It was also influenced by hidden fault dip that the guiding strength become more severe and the range of strong seepage zone became larger in mining seepage field with the increase of the hidden fault dip. © 2023 China University of Mining and Technology. All rights reserved.
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页码：17 / 24
页数：7
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