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功东高速公路大营盘深路堑开挖后轴线最大切深约为48.85m,形成高约78.9m的边坡。根据功东高速公路施工组织计划,探讨不同工况边坡开挖施工条件下的边坡安全系数;并进一步探讨了土体摩擦角、粘结力、地下水位、支护方案这些随机变量的敏感度。结果表明采用2台阶一开挖的施工方法是可行的,施工过程中,最易发生施工边坡失稳的工况点是在边坡近底部1/3位置和底部台阶;水的渗流对边坡稳定性影响十分明显,尤其是高边坡如果底部支挡结构排水不畅,反而不利于边坡的稳定。
The maximum cut depth of the axis after the deep excavation of the Seongdeong Expressway is about 48.85m, forming a slope of about 78.9m. According to the construction organization plan of Gongdong Expressway, the slope safety factor under different working conditions of slope excavation was explored. And the sensitivities of soil friction angle, cohesion, groundwater level and support scheme were further discussed degree. The results show that it is feasible to adopt two steps excavation method. During the construction, the most prone to instability of construction slope is in the bottom 1/3 of the slope and the bottom of the slope; The influence of slope stability is very obvious, especially if the high side slope is poorly drained by the bottom support structure, but not conducive to the stability of the slope.