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岩锚梁的岩台开挖是岩锚梁施工的关键技术 ,施工时 ,不仅要确保岩台在开挖过程中的稳定 ,而且也要确保岩台开挖前后的稳定 ,同时还要确保在后序开挖过程中不对已浇筑的岩锚梁自身结构的稳定性产生影响。江垭电站的岩锚梁施工 ,以工程地质体控制论为理论基础 ,岩台开挖分 4步进行 :第 1步在岩台以上 2m范围内进行预裂爆破 ;第 2步进行岩面光面爆破 ;第 3步在岩台以下 2m范围内进行预裂爆破 ;第 4步在第 3开挖层进行预裂爆破。岩台开挖后 ,成型规则 ,棱角分明 ,施工中爆破造成的裂隙影响深度符合设计要求 ,表明岩台的开挖是成功的。
Rock bench excavation of rock anchor beam is the key technology of rock anchor beam construction. During construction, it not only ensures the stability of rock table during excavation, but also ensures the stability before and after rock table excavation. At the same time, Post-sequence excavation does not affect the stability of the self-anchored rock-anchor beam. The rock anchor beam construction of the Jiangya Hydropower Station is based on the theory of engineering geological body control. The rock table excavation is divided into 4 steps: the first step is to conduct presplitting blasting within 2m above the rock table; the second step is to carry out rock surface light Surface blasting; Step 3 within the Rock Table 2m range of pre-cracking blasting; Step 4 in the third excavation blasting blasting. Rock table after excavation, forming rules, angular, blasting caused by the construction of the depth of the fracture line with the design requirements, indicating that the rock table is a success of excavation.