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牙根二级水电站对外交通专用公路K4+261.27~+420段深挖路基长158.73m,最大挖深45m,该段大部分基岩裸露,属斜向陡倾坡,表层岩体破碎,节理裂隙较发育,且发育花岗岩岩脉,局部岩体结构面相割,边坡的开挖易引发不利结构面贯通,从而影响边坡的稳定性,危害工程安全。经过方案比选,建议全坡面采用加强型挂网喷锚支护固坡。经过计算可知该段深挖路基按设计方案施工后在正常蓄水、暴雨、地震及库水骤降工况下均处于稳定状态,均能满足规范要求,说明设计方案合理有效,可为类似工程提供设计依据。
For the Tugoulu Hydropower Station, K4 + 261.27 ~ +420 deep excavation roadbed is 158.73m long and the maximum digging depth is 45m. Most of the bedrock is exposed and steep slopes, the surface rock mass is broken, the joint fissures are more serious Development and development of granite dikes, local rock face phase cut, the slope of the excavation is likely to lead to adverse structural surface through, thus affecting the stability of the slope, endangering the safety of the project. After the program comparison, it is recommended that the whole slope be enhanced with net-sprayed anchor support slope. After calculation, it can be seen that the section of deep excavation subgrade is in a steady state under normal storage conditions, rainstorms, earthquakes and reservoir water plunging conditions after construction according to the design scheme, all of which can meet the specifications, indicating that the design scheme is reasonable and effective and can be a similar project Provide design basis.