渗透系数空间变异条件下临界注液强度的计算

Calculation of Critical Injection Intensity under the Condition of Spatial Variability of Permeability Coefficient

以现场渗透系数测试实验和室内物理力学参数测试实验结果为依据,基于Geostudio有限元数值计算软件,选取江西信丰典型离子型稀土矿山进行注液作用下的边坡稳定性分析。研究结果表明,随深度的增加,矿体渗透系数呈现先快速后缓慢减小的变化规律,该变化规律可较好地解释当地稀土矿山浅层滑坡现象;临界注液强度与注液范围呈指数函数关系,当注液范围由20%增加到50%时,临界注液强度由0.11 m3/（m2·d）减小到0.045 m3/（m2·d）;设定注液范围为30%,当注液强度小于0.3 m3/（m2·d）时,随着注液强度的增大,滑坡的剪出口高度非线性增加,当注液强度大于0.3 m3/（m2·d）时,随着注液强度的增大,滑坡的剪出口高度处于一个稳定值。

Based on the field tests of permeability coefficient and the laboratory tests of physical and mechanical parameters,and the finite element numerical simulation software named Geostudio,the slope stability analysis of typical ion-adsorption rare earth mines in Xinfeng county,Jiangxi Province,was carried out under the action of liquid injection. The results showed that with the increase of depth,the permeability coefficient of ore body presented the law of decreasing rapidly first and then decreasing slowly. The variation law could be used to explain the phenomenon of shallow landslide in local rare earth mines. The relationship between critical injection intensity and injection range is exponential. When the injection range was increased from 20% to 50%,the critical injection intensity decreased from 0. 11 m3/（ m2·d） to 0. 045 m3/（ m2·d）. When the injection range was set to 30% and the injection intensity was less than 0. 3 m3/（ m2·d）,the nonlinear shear outlet height of landslide increased with the increase of injection intensity. When the injection range was set to 30% and the injection intensity was greater than 0. 3 m3/（ m2·d）,shear outlet height of landslide was in a stable value with the increase of injection intensity.