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为了使黏性土地层地基承载力计算和基坑稳定性分析能够考虑基础形状和深度影响,给出了一个计算地基承载力系数N_c值的近似解析计算方法,可以把不同形状和埋深基础的承载力统一在一个公式中计算。如果对塑性区深度作适当调整,可以使计算结果非常接近试验值和现场数据的调查结果。依据该方法,可证明地基承载力计算时采用的N_c值与基坑稳定性分析时采用的N_c值是同一的。基于该方法,可以使Terzaghi的抗隆起稳定分析方法能够考虑围护结构插入深度的影响;同时,文章也给出了一个浅基础承载力系数的近似估算方法。
In order to make the foundation bearing capacity calculation and foundation pit stability analysis of cohesive soil layer consider the influence of foundation shape and depth, an approximate analytical calculation method of calculating Nc value of foundation bearing capacity coefficient is given. Uniform bearing capacity is calculated in a formula. If the depth of the plastic zone is properly adjusted, the calculation result can be very close to the test value and the survey result of the field data. According to this method, it can be proved that the value of N_c used in calculation of foundation bearing capacity is the same as the value of N_c used in the stability analysis of foundation pit. Based on this method, Terzaghi’s method of anti-uplift stability analysis can consider the influence of the depth of the capping structure insertion depth. At the same time, an approximate estimation method of shallow foundation bearing capacity coefficient is given.