基于随机结构模型的新立矿区岩体渗透性分析

为了掌握三山岛金矿井下岩体渗水特性,确保海底采矿的生产安全,分析了新立矿区水文地质结构特点,调查了-105 m、-135 m 2个中段矿坑出水点并建立各中段渗水区水力联系,研究新立矿区岩体渗透系数张量,在一个测量面内把大测量区划分成许多小测区,把一定数量的小测区测量结果合并,得到不同大小测量面的结果。开发渗透张量计算程序,计算得出-105 m、-135 m中段岩体渗透系数张量和综合渗透系数,基于对新立矿区现场岩石露头的抽样统计,建立岩体结构面几何参数概率分布模型,通过对新立矿区岩体结构面进行随机模拟计算,得出岩体结构面连通率,修正了矿区岩体渗透系数。实测结果表明,采用连通率修正理想条件下计算出的渗透系数,具有良好的实际应用价值。

Analysis of Permeability Coefficient of Rock Mass in Xinli Mining Area Based on the Stochastic Structural Model

In order to grasp the water seepage characteristics of underground rocks in Sanshandao Gold Mine，and ensure the mining production safety at seabed，the hydrological and geological features of Xinli mining area is analyzed，and the water bursting points at -105 m and -135 m middle section are investigated，and hydraulic connections of every seepage zone in the middle are built.The permeability coefficient tensor of rock mass in Xinli mining area is researched.A large measurement area is divided into various small survey zones in a measurement plane，and then the measured data from some small zones are merged together，obtaining the measurement results of different areas.Based on the calculation program of permeability tensor，the permeability coefficient tensor and the overall permeability conductivity at -105 m and -135 m middle section are calculated out.According to the statistics of out-crop sampling in Xinli mining area，the geometry parameter probability distribution model of rock structural plane is established.The random simulation calculation of the rock structural plane in Xinli mining area is carried out to obtain the connectivity rate of rock structural plane，and correct the rock permeability coefficient.The measured results show that the permeability coefficient n the ideal condition of the corrected connectivity rate has a good practical application value.