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两河口水电站对外公路K32+080~+160段深挖路基,长80m,最大挖深40m,该段斜坡坡体结构为斜向反倾坡,岩体节理裂隙发育,并发育顺坡向不利结构面,边坡开挖较高容易引发不利结构面贯通,从而影响岩体边坡的稳定性,危害工程安全。综合比选各种设计方案,建议采用锚索框格梁结合喷锚支护固坡。经过计算可知该段深挖路基按设计方案施工后在天然工况、暴雨工况和地震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。
The section of K32 +080 ~ +160 of the external section of Lianghekou Hydropower Station is deep excavation with a length of 80m and a maximum excavation depth of 40m. The structure of this slope is inclined to the reverse slope, and the joints and fractures of the rock mass are developed. Faces, the higher the slope excavation easily lead to adverse structural surface through, thus affecting the stability of rock slope, endangering the safety of the project. Comprehensive comparison and selection of various design options, it is recommended to use the combination of bolt and girder anchoring Slope. After calculation, it can be seen that the deep excavation subgrade in this section is in a stable state under natural conditions, rainstorm conditions and earthquake conditions according to the design scheme, which can meet the requirements of the code, indicating that the design scheme is reasonable and effective and can provide design basis for similar projects .