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在工程实际中,当基础尺寸较小时,基底压力可当作直线分布,按材料力学公式简化计算.当计算基底出现拉应力时,基础便与地基局部脱开产生基底压力重分布.许多计算程序简单地以按材料力学公式计算的基底最小压力不小于零作为计算基底面积的控制条件,是不合理的.通过讨论明确地基承载力计算时基础底面在一定条件下可以出现拉应力,并且说明基础底面是否允许出现拉应力应具体情况具体分析,同时给出基础底面与地基土之间拉应力区面积的合理取值及相应基底最大压力的计算方法.
In engineering practice, when the base size is small, the base pressure can be regarded as a straight distribution, and the calculation is simplified according to the material mechanics formula. When calculating the tensile stress of the base, the base is partially released from the foundation to generate the base pressure redistribution. Many calculation procedures It is unreasonable to simply use the minimum pressure of the substrate calculated according to the formula of the material mechanics as the control condition for calculating the area of the basement. It is unreasonable to discuss clearly the basis stress of the foundation under certain conditions when discussing the calculation of the bearing capacity of the foundation. Whether or not the bottom surface is allowed to have tensile stress should be specifically analyzed, and the reasonable value of the area of the tensile stress zone between the foundation surface and the foundation soil and the calculation method for the corresponding maximum pressure of the foundation are given.