鹿鸣钼矿北区节理裂隙对边坡稳定性的影响研究

Research on influence of the joint fissure on slope stability in the north of Luming Molybdenum Mine

节理裂隙是影响边坡稳定性的重要因素之一,节理裂隙岩体变形与破坏性质复杂,具有隐蔽性,易使人们忽视岩体中发育的结构面的影响从而导致事故发生。通过对鹿鸣钼矿北区已揭露的510和525工作面的节理裂隙现场调查,获得其产状和平均间距,运用玫瑰花图对其进行统计分析。绘制510边坡与主要弱结构面的赤平投影图,分析主要结构面与边坡的组合关系,同时对F3断层与北区主要边坡组合关系进行赤平投影分析,得出沿280°∠83°、295°∠81°和110°∠77°三类节理面对边坡的影响较大,另外F3和F4断层之间的碎裂结构易产生楔形滑移、倾倒等破坏现象,F3断层与西北边坡、西南边坡可能产生局部滑动现象等。该研究结果对矿区安全生产有重要指导意义,其研究思路与方法可为其他边坡稳定性工程提供参考。

Joint fissure is one of the important factors affecting the slope stability. Because the complex and invisible properties of the deformation and failure in jointed rock mass, it is liable to make people ignore the influence of the development of structural plane of rock to cause frequent accidents. By the practical investigation of joint fissure of the exposed stages of 510 and 525 in the north of Luming Molybdenum Mine, the occurrence and average space of these joint fissures can be obtained by analyzing the joint fissure with rose diagrams. By drawing stereographic projection of slopes in 510 stage and analyzing the major weak structure plane and the combination relation of major weak structure planes and slopes as well as using the method of stereographic projection to analyze the combination relation of F3 fault and north main slopes, it indicates that the slope are greatly affected by three kinds of joint fissure： 280°∠83°、295°∠81° and 110°∠77°. In addition, the cracked structure between F3 fault and F4 fault is liable to cause damage like wedge slip and dumping. The local slip may occur in F3 fault, northwest slope and southwest slope. The results are important to guide the safety production in mining field, and it can also provide a study pattern and research methods for other conducting engineering activities of slope stability.