毕机沟露天矿台阶坡面角取值范围及最终边坡角研究  

Research on bench angle range value &final slope angle in Bijigou open-pit

作　　者：李俊平[1] 李鹏伟[1] 张浩[1] 

机构地区：[1]西安建筑科技大学材料与矿资学院,陕西西安710055

出　　处：《西安建筑科技大学学报（自然科学版）》2017年第4期598-603,共6页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

摘　　要：毕机沟露天矿南北剖面山坡与凹陷露天并存,且山坡露天高达270m,设计中台阶坡面角都取65~68°、最终边坡角都取45°可能不合理.应用快速拉格朗日有限差分法(FLAC-3D)专门研究该剖面的台阶坡面角取值范围,据此建立边坡台阶构成方案,并确定最终边坡角及局部边坡的加固方案.研究表明:台阶坡面角及最终边坡角取值均与边坡类型、开采深度及岩性有关;按岩质边坡上出现的拉应力值及其区域大小确定是否加陡或减缓边坡,并确定边坡局部的加固方案,经济合理、技术可行、简便实用.该方法适用于岩质露天边坡设计中安全合理地确定台阶坡面角及最终边坡角.An open pit north-south cross-sectional has both hillside open pit and hollow open pit, and the hillside open pit is up to 270 m high. But the step slope angles by design are taking 65 - 68°, the final slope angles are all 45°, which seems to unreasonable. Based on the design capacity, the step height is set by 15 m. Using the fast Lagrangian Finite Difference Method （FLAC-3D） specializes in the law of valuing the step slope angle. On this basis, the structural scheme of slope steps were built to study the final slope angle, the structure parameters of the steps and the local slope reinforcement scheme. And finally the step slope angle and the final slope angle are found to be related to slope type, mining depth and lithology. The tensile stress zone size appearing on the rock slope determines either to raise or slow down the step slope, and the local slope reinforcement scheme was proposed in terms of the tensile stress zone size. This method is economically reasonable, technically feasible, simple and practical, suitable for the determination of the step slope angle and the final slope angle when both technically safe and economically reasonable are asked.

关 键 词：露天开采 边坡稳定性 台阶坡面角 最终边坡角 FLAC-3D 边坡加固 

分 类 号：TD324[矿业工程—矿井建设]