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陕西省石砭峪水库采用定向爆破筑坝,其爆破装药置达1502吨,爆石方量达149.2万米~3,该区河谷两岸地形陡峻,平均坡度达45—60°。最大的危岩体有:(1)左岸上游龞盖,(2)左岸上游隧洞进口附近岩体,(3)左岸下游三角体,(4)右岸上游老虎咀。爆破中前三处均下滑,根据爆破前后两次1:500地面摄影图计算,总下滑方量达24.7万米~3。根据这一情况,本文用极限平衡法计算了危岩体软弱面的抗剪指标。
Shiyangyu Reservoir in Shaanxi Province uses directional blasting to build a dam. Its explosive charge reaches 1,502 tons and blasting mass reaches 1,492,000 m ~ 3. The steep terrain of the two sides of the valley in this area has an average slope of 45-60 °. The largest dangerous rock bodies are: (1) the upper left bank of the shroud, (2) the rock mass near the entrance to the upstream of the left bank, (3) the lower triangular body on the left bank, and (4) the tiger’s beak upstream from the right bank. The first three places in the blasting all declined. According to the two 1: 500 ground photography before and after blasting, the total sliding amount reached 247,000m ~ 3. According to this situation, the limit equilibrium method is used to calculate the shear strength index of the weak rock mass.