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对于软土地基上的建筑物的沉降计算,我国规范推荐采用分层总和法。分层总和法中地基附加应力的计算以点荷载作用下的半无限空间的Boussinesq解为基础。对于具有不同刚度和强度相差较大的地层而言,以此方法为基础计算得到的最终沉降往往偏大。本文提出一种基于多层弹性理论的考虑覆盖层对地基应力分散作用的地基沉降计算方法。这种方法的计算结果使地基中的应力水平较基于Boussinesq解的结果大幅降低,对于某工程实例而言,计算得到的地基中的总有效应力小于前期固结压力,土层的变形相对较小。工程实测的结果表明,所提出方法计算结果与实测结果较为接近。
For the settlement calculation of buildings on soft soil foundation, the standard of our country recommends the method of stratified summation. The calculation of the additional stress in the stratified total method is based on the Boussinesq solution of the semi-infinite space under the point load. For the strata with different stiffness and strength, the ultimate settlement calculated based on this method tends to be large. This paper presents a calculation method of foundation settlement considering the stress dispersion of overburden on the foundation based on multi-layer elasticity theory. The calculation results of this method reduce the stress level in foundation significantly lower than that based on Boussinesq’s solution. For an engineering example, the calculated total effective stress in the foundation is less than the pre-consolidation pressure and soil deformation is relatively small . The measured results show that the proposed method is close to the measured result.