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针对非饱和地基上的梯形路堤,提出其临界填筑高度计算的基本假定,进而考虑地基土的非饱和特性与实际侧压力系数,建立了均匀和线性2种吸力分布下地基临界荷载及路堤临界填筑高度的解析公式.所得解析公式具有很好的可比性,通过实例比较验证了解析公式的正确性及所给公式适用条件的必要性.参数分析结果表明:基质吸力及其分布、侧压力系数和吸力角对临界填筑高度的影响均很显著;忽略非饱和特性而按饱和土地基进行的路堤设计偏于保守,均布吸力较线性吸力的影响更明显;侧压力系数应选择以满足公式适用条件的真实值,吸力角的影响与基质吸力及其分布密切相关.
Aiming at the trapezoidal embankment on unsaturated soil foundation, the basic assumptions of calculating the critical filling height of the embankment are put forward. Then, considering the unsaturated characteristic and actual lateral pressure coefficient of foundation soil, The analytical formula of filling height is obtained.The obtained analytic formula has good comparability and the correctness of the analytic formula and the necessity of the applicable conditions of the given formula are verified by comparison with examples.The parameter analysis results show that the matrix suction and its distribution, lateral pressure The influence of coefficient and suction angle on the critical filling height is significant. The design of embankment on saturated soil foundation, which ignores the non-saturation characteristics, is more conservative than that of linear suction. The lateral pressure coefficient should be chosen to satisfy The true value of the formula applicable conditions, the impact of suction angle and the matrix suction and its distribution are closely related.