Effects of fracture dip and aperture of submarine metal mine surrounding rock on seepage characteristics

doi:10.16265/j.cnki.issn1003-3033.2023.09.1311

Abstract

Abstract:

In order to study the influence of fracture inclination and opening degree of high pressure surrounding rock of undersea metal mine on seepage characteristics and reveal the influence law of fracture inclination and opening degree of high pressure surrounding rock of undersea metal mine on seepage velocity and outlet flow, a multi-fracture seepage model of surrounding rock was established based on the coupling theory of fracture state and seepage velocity in Xinli mining area of Sanshandao, an undersea metal mine. The numerical simulation software COMSOL Multiphysics was applied to obtain the change of seepage velocity and outlet flow of groundwater in the crack of surrounding rock of a deep well by changing the crack dip Angle and crack opening. The results show that the Angle of fracture inclination has an important influence on the seepage velocity of groundwater, and the intersection of multiple fractures causes sudden changes in the seepage velocity of the groundwater. In the range of simulated inclination Angle, the larger the Angle of fracture inclination, the smaller the seepage velocity of groundwater outlet, the smaller the outlet discharge, and the more obvious the seepage velocity change at the intersection of cracks. When the crack opening is between 0.5 and 2 mm, the seepage velocity at the intersection of the crack changes obviously, and the crack opening has a significant effect on the seepage flow.

Key words: subsea metal mine, fracture dip, fracture aperture, seepage velocity, outlet flow

FU Cuicui, ZHANG Yongliang, QU Min, YIN Shili, LIU Yunfei, WANG Mingbin. Effects of fracture dip and aperture of submarine metal mine surrounding rock on seepage characteristics[J]. China Safety Science Journal, 2023, 33(9): 164-172.

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工况	裂隙Ⅱ 倾角/(°)	裂隙开度/mm	研究目的
1	45, 60, 75, 90	1	裂隙Ⅱ倾角对裂隙Ⅱ中地下水渗流特性的影响
1	45, 60, 75, 90	1	裂隙Ⅱ倾角对裂隙Ⅳ中地下水渗流特性的影响
2	90	0.1, 0.5, 0.75,1.25, 2	裂隙开度对裂隙Ⅱ中地下水渗流特性的影响
2	90	0.1, 0.5, 0.75,1.25, 2	裂隙开度对裂隙Ⅳ中地下水渗流特性的影响

流体(水)		围岩		裂隙
密度/ (kg·m^-3)	动力黏度/ (Pa·s)	孔隙率/%	渗透率/μm²	孔隙率/%	渗透率/μm²
1 000	0.001	0.1	9.81	0.3	2.06×10⁴