Seepage characteristic of rock mass in the Xinli mining area based on fracture geometry measurement method
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摘要: 新立矿区主要可采矿体分布于海底岩体中,查明矿区工程岩体的渗透特征对保障海底采矿安全具有十分重要的意义。在综合分析新立矿区水文地质工程地质特征的基础上,以现场调查的岩体结构面几何数据为基础,开发了渗透系数张量计算程序,计算了岩体综合渗透系数,根据前期的压水试验结果修正了计算结果,修正后的结果表明矿区-105,-135水平工程岩体整体上呈弱透水性,局部呈微透水性,-165水平岩体整体上呈微-弱透水性;岩体渗透性随深度的增加而降低。Abstract: The main exploitable ore body in the Xinli mine area occurs in an undersea rock mass. In order to ensure the safety of undersea mining, it is of great significance to verify the seepage characteristic of the rock mass in the Xinli mining area. The calculation process of permeability coefficient tensor and synthetic permeability coefficient of the fractured rock mass were introduced in detail. The calculation program of permeability coefficient tensor was developed with the Visual C#. The conditions of hydrogeology and engineering geology of the Xinli mining area were analyzed. Based on the fractures geometry data surveyed in situ, the permeability coefficient tensors of the rock mass at levels of -105, -135 and -165 m above the sea level were calculated. The results were modified in terms of downhole permeability tests. The modified results indicate that the rock mass has weak permeability at levels of -105 and -135 m above the sea level on the whole and micro-weak permeability at level of -165 m above the sea level. The permeability reduces with the buried depth of the rock mass.
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