基于FLAC^(3D)树根桩的堤防加固计算及优化  

Root Pile Simulation Method and Its Optimization in the Analysis of Dike Reinforcement with FLAC^(3D)

作　　者：王波 李大亮 张胤[3] 

机构地区：[1]上海市金山区海塘管理所,上海201507 [2]南京市水利规划设计院有限责任公司,江苏南京210022 [3]河海大学水利水电学院,江苏南京210098

出　　处：《人民黄河》2014年第5期9-11,共3页Yellow River

基　　金：国家自然科学基金资助项目(51079044);水利部公益性行业科研专项(201001035)

摘　　要：研究了树根桩几何参数对堤防加固效果的影响,结合一般边坡抗滑稳定性分析实例,介绍了采用FLAC3D软件中的结构单元模拟树根桩的加固方法,并基于丰乐河堤防的树根桩初步设计方案,通过改变树根桩的桩长、截面尺寸和桩基范围等分析了树根桩主要计算参数的敏感性,然后使用BP神经网络方法对结果进行了优化。结果表明:灌注范围对堤防安全系数的影响最大,增大树根桩桩长及桩截面直径也能不同程度地提高堤防安全系数;优化后的树根桩桩长为8m、桩截面直径为0.2 m、灌注范围为0.25 m3。In order to detect the root pile dike reinforcement effect with different geometrical parameters,a numerical method was introduced by the general side slope stability analysis instance using the structural element of FLAC3D . Considering the pile length,the pile-sectional size and the perfusion range of the root pile,the sensitivity to the reinforcement effect of the root pile was discussed based on the preliminary design of the Fengle River dike root pile. Subsequently,an optimization result of the reinforcement design was proposed using BP neural network approach. The results show that the perfusion range of the root pile is an influential parameter to the reinforcement result,increasing root length or of the root pile can be improved the safety factor of the dike;the length or of the root pile,the pile-sectional diameter and the perfusion range of the root pile are 8 m, 0. 2 m,0. 25 m3 respectively after optimizing.

关 键 词：BP网络 结构单元 树根桩 堤防加固 

分 类 号：TV871.1[水利工程—水利水电工程]