GRF增强构件优化设计数值模拟探究  

Design optimization of reinforcing member of GRF pile foundation

作　　者：胡毅夫[1,2] 刘晓波[1,2] 马莉[1,2] 

机构地区：[1]中南大学资源与安全工程学院,湖南长沙410083 [2]水能资源利用关键技术湖南省重点实验室,湖南长沙410083

出　　处：《水文地质工程地质》2014年第6期76-81,共6页Hydrogeology & Engineering Geology

基　　金：湖南省自然科学基金项目(14JJ4003);水能资源利用关键技术湖南省重点实验室开放研究基金项目(PKLHD201308)

摘　　要：采用有限差分软件FLAC3D建模对GRF桩基础增强构件的设计进行优化探究以达到安全、经济、环保的综合效益,重点研究了增强构件的直径、设置角度以及强度参数对GRF桩基础承载性能的影响。数值模拟研究表明:在其他条件一定的情况下,随着增强构件直径增大,桩顶沉降量逐渐减小,超过一定的值沉降量反弹增加;增强构件的角度过大不利于桩体承载,应根据桩、构件、土三者的强度关系决定构件的角度;增强构件强度在临界值之前增加会导致桩顶沉降量线性下降,临界值之后构件强度增加对沉降量影响甚微;结合数值模拟结果初步探究GRF桩基础的沉降理论计算。Study the design on reinforcing member of geo-reinforcement foundations by using FLAC3 D software to achieve security,economic,and environmental benefits of integrated.This article mainly focuses on bolt diameter,angle and strength parameters which have effects on the settlement of the pile top.Numerical analysis shows that with the bolt diameter increasing,the pile top settlement displacement decreases,and the settlement bounce increases after a certain increasing value;Lager anchor angle is not conductive for GRF piles to bear loads.It should be decided by the strength relationship between pile,soil and anchor.When anchor strength is less than the threshold intensity,its increases lead pile settlement decreases linearly.But when it is greater than the threshold intensity,the settlement of the pile top will be hardly effected with anchor strength increases.

关 键 词：岩土加强基础(GRF) 增强构件(支杆) 沉降量 优化设计 FLAC3D 

分 类 号：TU473.1[建筑科学—结构工程]