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【目的】对软黏土上覆砂层的条形基础承载力进行分析,为土层存在软弱下卧层情况下的浅基础设计提供理论参考。【方法】采用理论推导的方法,在扩散投影模型的基础上,根据基础下方砂土层微元体的受力分析,推导出砂层下卧黏土层时条形基础的极限承载力计算公式,并给出了参数取值建议。【结果】根据分析,基础宽度、砂土层厚度、砂土层强度、黏土层强度、荷载扩散角等因素都对浅基础的极限承载力有一定影响,在建立的模型中对这些因素均进行考虑。为验证该模型的有效性,对已有的离心机试验模型进行了计算,得出用推导的公式计算出的极限承载力与离心机试验数据十分接近,模型相对误差均小于10%。【结论】该公式可用于软黏土上覆砂层时的条形基础承载力计算。
【Objective】 The purpose of this paper is to analyze the bearing capacity of strip foundation of overlying sand layer on soft clay so as to provide a theoretical reference for the shallow foundation design in the presence of weak underburden layer. 【Method】 On the basis of the diffusion projection model, the formula of ultimate bearing capacity of strip foundation under the layer of clay under the sand layer was deduced based on the stress analysis of the micro-bodies in the sand layer beneath the foundation. And give the suggestion of parameter value. 【Result】 According to the analysis, the factors such as foundation width, thickness of sand layer, sand layer strength, clay layer strength and load spreading angle all have some influence on the ultimate bearing capacity of shallow foundations. All these factors are taken into account in the established model consider. In order to verify the validity of this model, the existing centrifuge test model was calculated, and the calculated ultimate bearing capacity calculated by the derived formula is very close to the centrifuge test data. The relative error of the model is less than 10%. 【Conclusion】 This formula can be used to calculate the bearing capacity of strip foundation when covered with soft clay.