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文主要对墙背(台)被动土压力的计算方法进行了探讨。笔者拟假定墙背(台)填土受到被动破坏时其滑动面呈对数螺旋曲线形,从而导出了被动土压力的计算式。本数解法与塑性解法、摩擦园图解法、反复试算渐近法、库伦公式计算法相比,在计算方法上和计算精度上都有一定的优越性。文中并提出当δ≥1/3ψ时,库伦公式不可用,误差大,应按曲线滑动破裂面来计算,可参用本文数解法解之。
The paper mainly discusses the calculation method of passive earth pressure on the back of the wall. The author intends to assume that the sliding surface of the back of a wall (table) filled with soil is logarithmic spiral curve when it is subjected to passive failure, so as to derive the formula of passive earth pressure. Compared with the plastic solution method, the friction park method, the repeated trial asymptotic method and the coulomb formula method, this numerical method has some advantages in terms of calculation method and calculation precision. In the paper, it is pointed out that when δ≥1 / 3ψ, Coulomb’s formula is not available, and the error is large. It should be calculated by sliding the rupture plane according to the curve.