软岩地基中新型倒肋式风机基础力学性能有限元分析  

Finite Element Analysis of Mechanical Properties of a New Type of Inverted Beam Plate Fan Foundation on Soft Rock Foundation

作　　者：海洪[1] 孙鹏金 张延年[1] HAI Hong;SUN Pengjin;ZHANG Yannian(School of Civil Engineering,Shenyang Jianzhu University,Shenyang,China,110168)

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168

出　　处：《沈阳建筑大学学报（自然科学版）》2024年第2期267-275,共9页Journal of Shenyang Jianzhu University：Natural Science

基　　金：“十三五”国家重点研发计划项目(2019YFC1907202);辽宁省重大科技专项项目(2020JH1/10300005)。

摘　　要：目的 提出一种新型倒肋式风机基础,解决软岩地基中采用梁板式风机基础带来的挖方量大、模板支设繁琐、施工成本高、周期长等问题。方法 以2.5 MW风机为例,采用ABAQUS有限元分析软件,建立相同尺寸的倒肋式与梁板式风机基础模型,对比两种基础在极端工况下的倾斜率、水平位移、破坏特征等,并结合挖方量、模板工程量对两者的经济性进行分析。结果 倒肋式基础的水平位移为0.444 mm、倾斜率为0.012 1%,均满足规范要求;倒肋式基础的肋梁受力特征与悬臂梁相似,在基底反力作用下肋梁与墩台连接处承受的剪力及弯矩较大,容易开裂破坏,可通过增加肋梁截面高度改善;倒肋式基础相较于梁板式基础土方挖量可节省54%、模板工程量可节省48%。结论 倒肋式基础充分发挥出了倒置肋梁与软岩地基之间齿槽嵌固的优势,相较于梁板式基础不仅具有更优的抗滑移稳定性和受力性能,而且减少了挖方和模板工程量,经济效益显著。In order to solve the problems of large excavation volume,cumbersome formwork support,high construction cost,and long cycle caused by using beam slab fan foundation in soft rock foundation.Research on a new type of ribbed fan foundation.Method:Taking a 2.5 MW wind turbine as an example,ABAQUS finite element analysis software was used to establish foundation models of the same size of inverted rib and beam plate wind turbines.The inclination rate,horizontal displacement,and failure characteristics of the two foundations under extreme working conditions were compared,and the economic efficiency of the two was analyzed by combining excavation and formwork quantities.The horizontal displacement of the inverted rib foundation is 0.444 mm,and the inclination rate is 0.0121%,both of which meet the requirements of the specifications;The force characteristics of the rib beam of the inverted rib foundation are similar to that of the cantilever beam.Under the action of the base reaction,the shear force and bending moment borne by the rib beam at the connection between the pier and abutment are relatively large,which is prone to cracking and damage.This can be improved by increasing the height of the rib beam section;Compared to beam and slab foundations,ribbed foundations can save 54%in earthwork excavation and 48%in formwork engineering.Conclusion:Inverted ribbed foundation fully utilizes the advantages of tooth slot embedding between inverted ribbed beams and soft rock foundation.Compared with beam slab foundation,it not only has better anti slip stability and stress performance,but also reduces excavation and formwork engineering,and has significant economic benefits.

关 键 词：软岩地基 梁板式风机基础 倒肋式风机基础 有限元分析 倾斜率 

分 类 号：TU476[建筑科学—结构工程]