用反向渐进结构优化方法研究洞室支护优化

洞室开挖支护的优化是在铁路隧道、矿山开挖、水电站建设中经常面对的课题,特别是研究洞室开挖支护拓扑优化有着重要的意义。本文利用近年来发展的渐进优化方法(ESO)的概念,提出了反向ESO方法的迭代格式,建立了洞室开挖支护优化的准则及其敏感度,研究了均匀地基不同地应力条件使得开挖卸荷产生的总应变能最小的最优支护拓扑。结果证明了反向ESO方法的适用性,最优支护拓扑大致成椭圆或者圆形,其主轴方向与最大主应力主轴方向相同。

Topology optimization of tunnel support using reverse evolutionary structural optimization method

Optimization of tunnel supporting must be faced in railway tunnel construction,mine excavation and hydropower engineering.Study on topology optimization of tunnel supporting is very important.A reverse evolutionary structural optimization method is presented,which devoloped the criteria and iterative formation of optimization of tunnel supporting.The optimal topology of tunnel supporting in homogenous ground under various site stresses,which minimized the total strain energy,is studied.Results demonstrate the validity of the presented method, and the optimal topology of surpporting is circular or elliptic whose principle axes parallel to the derection of the maximum principal stresses.