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我国工业与民用建筑地基基础设计规范(TJ7—74)所推荐的地基最终沉降量计算方法是一种简化了的分层总和法。就其计算过程来讲并不复杂,但仍需进行多次的数字运算。特别是在确定压缩层范围内其压缩层深度 Z_n 最后1米的沉阶量△S_n’要小于或等于 Z_n 范围总沉降量的2.5%时,更要多次试算方能得出满意的结果。如果考虑到要由一系列的试算方能满足变形比2.5%这一比值所带来的麻烦,则就容易明瞭设计者即使遇到乙类地基的设计计算范畴,亦仅在特殊情况下才去进行必要的基础沉降计算。本文拟用规范公式及附录五所给数据并按如下见解去建立中小型基础的最终沉降量
The method for calculating the final settlement of foundations recommended by China’s Industrial and Civil Building Foundation Design Standard (TJ7-74) is a simplified layered summation method. It is not complicated in terms of its calculation process, but it still requires multiple digital operations. Especially when determining the depth Z_n of the compression layer within the scope of the compression layer, the final dimension of the compression depth Z_n should be less than or equal to 2.5% of the total settlement of the Z_n range, and multiple trials must be performed to obtain satisfactory results. . If one considers that a series of trials can solve the problem caused by the ratio of deformation ratio of 2.5%, it is easy to understand that even if the designer encounters the design calculation category of the foundation B, it will only be under special circumstances. To do the necessary basic settlement calculations. This paper proposes to use the normative formula and the data given in Appendix 5 and follow the findings below to establish the final settlement of the small and medium-sized foundations.