埋深基础沉降实用计算方法

A PRACTICAL CALCULATION METHOD FOR SETTLEMENT OF EMBEDDED FOUNDATION

现有埋深基础的沉降计算方法是基于地面加载的相关理论和经验系数提出的。通过对实际埋深基础、地面、坑内和体内加载模型的分析,发现埋深基础的沉降既有埋深效应,还受基础刚度的影响。对此,将基础假设为相应大小的地基土,即柔性埋深基础,其沉降计算式可综合弹性半空间体内加载的应力解析式和分层总和法得到;后用有限元方法分析基础刚度对沉降的影响规律,并得到刚度调节系数;将两者结合形成埋深基础沉降实用计算方法,对比发现其较现有方法有更好的准确度。

For the embedded foundation,the existing calculation methods of settlement were based on the theory of ground loading and empirical coefficients.Based on the analysis of the loading models of embedded foundation,ground,foundation exvaction and internal structure,it was found that the settlement of embedded foundation was influenced by both of the embedment effect and foundation stiffness.Therefore,the real embedded foundation was transformed into embedded flexible foundation by assuming to be the soil of the corresponding size.The calculation formula of embedded flexible foundation was proposed based on the stress analytical solution of uniform loading within an elastic half-space and the layerwise summation method.Then,the finite element method was used to analyze the influence of the foundation stiffness on the settlement,and the stiffness adjustment coefficients were obtained.Thus the practical calculation method for settlement of embedded foundation was proposed.Comparing with existing methods,it revealed that the proposed method had good accuracy.