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以朗肯土压力理论为基础,通过各种假设条件及理论推导,得到了两种黏性土主动土压力修正公式。与实测土压力值比较分析得出:计算方法一的结果小于朗肯土压力值,同时又大于实测值,在保证工程安全的前提下提高了经济性。由于土体极限开裂深度与土体抗拉强度的计算采用的是经验公式,使得公式在理论上不太严密,有待进一步研究。计算方法二对于土体较浅的工况,其安全性有保证,也能达到较好的经济性。在已知土体抗剪强度实际规律的情况下采用该思路进行计算,其结果的普适性将更强。两种计算方法均在一定程度上解决了黏性土采用朗肯主动土压力计算比实测值偏大的问题,可为类似的工程设计与研究提供一定的参考。
Based on Rankine’s theory of earth pressure, two kinds of correction formulas for active earth pressure of clay are obtained through various assumptions and theoretical derivations. Compared with the measured earth pressure, it is concluded that the result of the calculation method 1 is less than the Rankine earth pressure value and is larger than the measured value at the same time, which improves the economy under the premise of ensuring the project safety. Because of the limit of soil depth cracking and soil tensile strength calculation using empirical formula, making the formula in theory less stringent, pending further study. Calculation method 2 For the shallow soil conditions, its security is guaranteed, but also to achieve better economy. This method is used to calculate the actual law of shear strength of soil so that the result will be more universal. To some extent, the two calculation methods solve the problem that Rankine’s active earth pressure calculated by clay is larger than the measured value, which can provide some references for similar engineering design and research.