土压力问题的变分解答

用变分学方法导出了与朗肯土压力公式和库伦土压力公式完全一致的土压力计算公式，并且一般情况下的极值曲线线不同一条直线，而是比较复杂的曲线，在 倾斜边坡情况下的伦公式仅仅是一个特解。

Varitional Solution to Active Pressure and Passive Pressure

Varitional Solution to the active pressure and passive pressure is made out and this solution completely accords with Rankine's solution and Coulomb's solution in simple conditions. Generally,ultimate curves for the computation of pressuers are not linear but complex,and Coulomb's solution is only a special solution.