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台阶法作为加强贴坡路堤稳定性的方法被广泛应用,而台阶的适用条件和台阶型式是其设计中的重点,对此相关设计规范中对此并无详细描述.结合高速公路建设实践,采用数值计算软件FLAC对岩质贴坡路堤的台阶设置进行模拟,通过对不同工况的岩质贴坡路堤稳定性计算,归纳总结出台阶的适用条件和台阶型式,计算结果显示:岩质斜坡地基上台阶设置主要针对滑动破坏为整体滑动和折线型滑动,对于圆弧形滑动,即填方内部破坏则影响不明显;在不同斜坡坡度下,岩质斜坡地基上填方路堤极限承载力随台阶宽度的加大而增加,挖台阶与否对其极限承载力的影响较大;台阶的宽度大于1m时,台阶宽度对其极限承载力影响不明显.
The step method is widely used as a method to enhance the stability of embankment, and the applicable conditions and steps of the step are the key points in the design, which are not described in detail in the relevant design specifications.With the practice of highway construction, Numerical simulation software FLAC is used to simulate the step setting of rock slope embankment. Based on the calculation of rock slope embankment stability under different working conditions, the application conditions and the step type of the step are summarized. The results show that the rock slope foundation The setting of the upper step mainly aims at the sliding failure as a whole sliding and the folding line sliding. For the arc-shaped sliding, that is, the internal failure of the filling has no obvious effect. Under different slope incline, the ultimate bearing capacity of embankment with rock slope foundation changes with the step When the width of step is greater than 1m, the effect of step width on the ultimate bearing capacity is not significant.