土钉支护结构优化设计的有限元分析

考虑土钉-土体的相互作用，建立三维有限元模型，分析计算土钉支护结构的内力和位移，提出了变形控制和应力控制相结合的优化设计方法。采用遗传算法，以应力和位移为约束条件，以工程造价为目标函数，建立了土钉支护结构的优化设计数学模型，并编制了相应的计算程序，通过算例分析，并基于规范法的优化设计结果相比较，得出本文的设计方法更为合理的参考结论。

Three-dimensional finite element analysis of structure optimal design in soil nailing

The interaction between soil nailing and soil is considered and a true three-dimensional finite element model has been developed to analyze the strain-stress and the deformation performances of soil nailings.The optimum design method with deformation control and stress control of soil-nail retaining structure is presented.Using genetic algorithms and complex method,the mathematical model of structural optimal design is established regarding the stress and the deformation as constraint conditions and regarding the project cost as objective function;and the calculation program is compiled correspondingly.Taking a case study and comparing with the result of specification method and the optimal results based on specification method,the present optimal method is more reasonable.