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工程概况京福高速公路福州段F A6标K286+440~+645右边坡,最大挖深61米,共分为8个台阶。边坡上部为强风化凝灰岩,厚约4~5米,中部为弱风化凝灰岩,厚约20~25米,下部为微风化凝灰岩,节理发育。开挖后坡体高陡、岩体破碎、稳定性差。在边坡第四级K286+510~K286+598和第五级K286+
Project Overview Fuzhou section of Beijing-Fuzhou Expressway F A6 standard K286 + 440 ~ + 645 right slope, the maximum depth of 61 meters digging, is divided into 8 steps. The upper part of the slope is strongly weathered tuff with a thickness of 4 to 5 meters. The middle part is weakly weathered tuff, with a thickness of 20-25 meters. The lower part is slightly weathered tuff, and the joints develop. After excavation, the slope is steep, the rock mass is broken, and the stability is poor. The fourth grade in the slope K286 +510 ~ K286 + 598 and the fifth grade K286 +