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从基本假定、判定条件、计算模式等方面,归纳并比较了几种前人提出的有限土体主动土压力计算方法,并且通过一个实例,将各种方法的计算结果与朗肯方法计算结果进行对比,发现在一定深度范围内,有限土体土压力表现出小于朗肯土压力的趋势。随着计算深度的增大,有限土体土压力计算结果呈非线性增长,且增长幅度渐渐变小;对于单层砂土,有限土体土压力计算结果普遍小于或接近朗肯方法计算结果;但对于单层粘性土,在浅部有限土体土压力计算结果大于朗肯方法计算结果,随着深度的增加计算结果才逐渐减小。最后应用Geo X软件,给出了一个使用北京市地方规范方法计算有限土体主动土压力从而计算排桩位移及内力的算例。
This paper summarizes and compares the calculation methods of active earth pressure of finite soil proposed by several predecessors in the aspects of basic assumptions, judgment conditions and calculation modes. The calculation results of various methods are compared with those of Rankine method through an example In contrast, it is found that within a certain depth range, the soil pressure of the finite soil shows a trend smaller than the Rankine soil pressure. With the increase of calculation depth, the calculation result of soil pressure in finite soil shows a non-linear growth, and the growth rate becomes smaller. For single layer of soil, the calculation results of soil pressure in finite soil are generally less than or close to Rankine’s method. However, for the single-layer clayey soil, the calculated result of soil pressure in the shallow soil is larger than that of the Rankine method, and the calculation result decreases with the increase of the depth. At last, an example is given using Geo X software to calculate the displacements and internal forces of piles by using the local normal method of Beijing Municipality to calculate the active earth pressure of finite soil.