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采用Boltzmann剪切松弛模型和体积弹性模型组合的黏弹性半空间地基模型,考虑筏板的横向剪切变形效应和柱荷载随时间的变化,在时间增量段对基底反力进行Newton二次插值,建立了时间域内黏弹性地基与厚筏基础相互作用分析的耦合边界元数值方法,并导出了相应的数值计算公式,为分析施工过程以及施工结束后筏板基础随时间持续发展的沉降和差异沉降以及弯矩和剪力提供了一种有效的数值计算方法。计算表明,在建筑物施工结束后,随着地基的蠕变,基底反力由基础中间向四周转移,但这种变化并不显著。筏板的沉降、差异沉降和最大弯矩则随地基的蠕变在一个较长时间内显著增加,最终接近于一稳定值。对于蠕变特性明显的地基,设计时应予以重视。
Based on the viscoelastic half space foundation model combined with the Boltzmann shear relaxation model and the bulk elasticity model, considering the lateral shear deformation effect of raft and the change of column load with time, the Newton quadratic interpolation , A coupled boundary element numerical method for the analysis of the interaction of viscoelastic and thick raft foundations in time domain is established and the corresponding numerical formulas are derived. In order to analyze the settlement and difference of the construction process and the sustainable development of raft foundation over time after construction Settlement and bending moment and shear force provide an effective numerical method. The calculation shows that after the construction of the building, with the creep of the foundation, the reaction force of the substrate is transferred from the base to the periphery, but the change is not significant. The settlement, the differential settlement and the maximum bending moment of the raft increase significantly with the foundation creep in a long time, finally reaching a stable value. For the foundation with obvious creep characteristics, the design should pay attention to it.