研山铁矿顺倾层状边坡渗流特征分析

Analysis of Seepage Characteristics of Dip Bedded Slope in Yanshan Iron Mine

研山铁矿东帮边坡临近新河,受地下水影响较大,揭示其渗流规律对分析边坡稳定性至关重要。应用边坡岩体各向异性渗流-应力耦合模型,对研山铁矿顺倾层状边坡的各向异性渗流规律进行模拟分析。结果表明:采用各向异性岩体渗流-应力耦合模型,并考虑层状岩体岩层倾角范围,可获取较为准确的地下水位范围;层状结构面的高渗透性导致顺倾边坡渗流场表现出显著的结构面控渗特征,较各向同性岩体沿着地下水入渗方向的等效渗透系数更高;当岩层倾角大于45°后,随角度增加,边坡沿着地下水入渗方向的等效渗透系数降低;顺倾层状边坡更利于导通河流与深部边坡,随着开采深度的增加,容易在深部形成局部承压水,需加深注浆帷幕或者地下连续墙截排水;深部边坡需要加强疏干排水,采用堵排相结合的方式来减小地下水对顺倾层状边坡的危害。

The east slope of Yanshan Iron Mine is close to the Xin River,which is greatly affected by groundwater.It is very important to reveal its seepage law for analyzing slope stability.The anisotropic seepage-stress coupling model of slope rock mass is used to simulate and analyze the anisotropic seepage law of the dip bedded slope of Yanshan Iron Mine.The results show that a more accurate range of groundwater level can be obtained by using the seepage-stress coupling model of anisotropic rock mass and considering the dip angle range of layered rock mass.The high permeability of the layered structural plane leads to the significant seepage control characteristics of the structural plane in the seepage field of the dip slope,which is higher than the equivalent permeability coefficient of the isotropic rock mass along the direction of groundwater infiltration.When the dip angle of the rock stratum is greater than 45°,the equivalent permeability coefficient of the slope along the direction of groundwater infiltration decreases with the increase of the angle.The dip bedded slope is more conducive to connecting the river and the deep slope.With the increase of mining depth,it is easy to form local confined water in the deep part,and it is necessary to deepen the grouting curtain or the underground continuous wall to intercept and drain.The deep slope needs to strengthen the drainage,and the combination of plugging and drainage is used to reduce the harm of groundwater to the dip bedded slope.