基于差异沉降控制的地基基础优化设计方法

Optimized Design Method of Foundation Based on Differential Settlement

目的为减小建筑物基础的差异沉降，针对天然地基、复合地基以及复合桩基，提出基于差异沉降控制的地基基础优化设计方法．方法通过优化天然地基、复合地基以及复合桩基在桩基平面内的支承刚度，建立地基基础支承体刚度人为优化的数值计算模型，分析了上述方法控制差异沉降的效果．结果通过人为优化支承刚度分布的方法，天然地基、复合地基以及复合桩基上基础的弯矩平均减少80％，不均匀沉降平均减少75％-90％，近似达到零差异沉降的目标．结论笔者方法可显著地减少基础的弯矩和差异沉降，对工程设计具有一定的借鉴作用．

In order to reduce differential settlement of foundation, the paper aims at proposing optimum design methods of subgrade and foundation based on differential settlement control for subgrade, composite foundation and composite pile foundation. Bearing rigidity of subgrade, composite foundation and composite pile foundation should be optimized in plane of pile foundation, and numerical calculation model of bearing rigidity optimized by authors were built up. Consequently, result of these methods to control differential settlement can be analyzed. Bending moment of foundation on subgrade, composite foundation and composite pile foundation reduced 80% averagely, and differential settlement reduced 75% -90% averagely through optimum design methods. The goal of zero differential settlement was reached approximately. Result of numerical computation shows that the methods above could reduce internal force of foundation and differential settlement significantly, and could be used for reference by engineering project.