【摘要】 采用三维刚体极限平衡法对小湾电站进水口边坡进行了稳定分析与加固方案优化.首先,采用三维块体系统的自动识别方法,找出了危险滑动块体组合,计算出不加固时的安全系数,并通过对地质参数的敏感性分析,找出了控制性的滑动面和块体组合.其次,计算了最小锚固力并指出了较优的加固范围,对纯锚固方案和联合加固方案(预应力锚索加抗剪洞)的加固效果进行了比较,得出了联合加固方案较优的结论.最后,根据开挖现场最新揭露的地质产状,对边坡的稳定性重新进行分析,并调整了加固方案.研究结果对设计和施工具有较大的参考价值,对其他工程也有一定的借鉴作用.更多还原

【Abstract】 Based on the 3D rigid limit equilibrium method, the stability of the intake slope of Xiaowan Hydropower Station is analyzed; and the reinforcement scheme is optimized. Firstly, the dangerous sliding block combinations are searched out by the automatic identification method of 3D block systems. The safety factor of each block combination at each operating mode without reinforcement is calculated; and after the sensitivity analysis of the geologic parameters, the dominant sliding plane and sliding block combinations are found out. Secondly, the smallest anchoring force needed by the slope is got and the preferable dips of anchors and anchoring zone are given. Further analysis indicates that the united reinforcement scheme with prestressed anchors and anti-shear keys is more effective and more economical than the reinforcement scheme of prestressed anchors only. On the basis of these studies and the new geologic parameters got from the excavation construction site, the stability of the slope is reanalyzed rapidly and the reinforcement scheme is adjusted correspondingly. Most of our judgments are accepted by the designers and take a good effect in construction. The 3D rigid limit equilibrium method and our research may be meaningful and helpful to other projects.更多还原