溪洛渡水电站某危岩体稳定性及加固措施研究

在现场调查分析的基础上，提出了溪洛渡水电站某危岩体的两种可能失稳模式（剪切坠落或拉裂倾倒失稳），进而建立了相应的稳定性计算极限平衡力学模型，而且对危岩体的变形和破坏特征进行了数值模拟分析，分析结果表明，危岩体抗拉裂倾倒稳定性较差，剪切坠落失稳的稳定性系数较高。在稳定性分析的基础上，计算出危岩体倾倒失稳时，安全系数为1.5时的锚固力，进而提出了危岩体加固方案：充填凹岩腔+填充裂隙+预应力锚索＋锚杆联合加固，数值模拟表明此加固方案效果良好。

Study on stability and reinforcement measures of an unstable rock masses of Xiluodu Hydropower station

Based on investigation on spot and geological analysis, an unstable rock masses of Xiloudu Hydropower Station may to be failure through two modes: shear-falling and rip-topple is proposed; and a mechanical model for calculation of stability by limit equilibrium theory is established; and the unstable rock masses deformation and failure characteristics are analyzed by numerical simulation. The results show: stability of the unstable rock masses is relatively bad if the failure mode is rip- topple , but is good if shear-falling. Based on stability analysis, the anchor reinforcement force is calculated as 12 306 kN when safety factor is 1.5 and the failure is rip-topple; and some reinforcement measures of the unstable rock masses are put for ward follows: fill hollow of rock and fill in cracks and prestressed anchor cables and anchor bolts combination reinforcement. The results of numerical simulation show that: effect of the reinforcement measures is better.