风电场地基液化对桩筏基础受荷响应的影响特征  

Soil Liquefaction’s Effect on the Response of Piled Raft for Wind Turbine

作　　者：宋英龙 谷泽雨 高礼 李卫超[2] 朱碧堂 杨敏[2] SONG Yinglong;GU Zeyu;GAO Li;LI Weichao;ZHU Bitang;YANG Min(Hunan Electric Power Design Institute Co.Ltd.China Energy Engineering Group,Changsha 410007,China;Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China;Shanghai Qimstar Technology Co.,Ltd.,Shanghai 200092,China;Engineering Research&Development Centre for Underground Technology of Jiangxi Province,Nanchang 330013,China)

机构地区：[1]中国能源建设集团湖南省电力设计院有限公司,长沙410007 [2]同济大学地下建筑与工程系,上海200092 [3]上海同济启明星科技发展有限公司,上海200092 [4]江西省地下空间技术开发工程研究中心,南昌330013

出　　处：《结构工程师》2021年第2期102-109,共8页Structural Engineers

基　　金：国家自然科学基金资助项目(41972275,41877236,52020105003)。

摘　　要：对于具有高耸、柔性特征的风机支撑结构,其基础在工作时主要受到风等导致的水平荷载和倾覆弯矩。但位于地震强烈的地区,地基液化会引起基础的水平承载能力显著降低,是风电基础设计必须考虑的重要因素。结合河南某风电场实际工程建设,首先基于我国当前规范对该风电场地基液化情况进行判定;其次针对地基液化工况与经处理加固后不液化工况,采用同济启明星自主研发的风机基础设计软件FDOW对风机桩筏基础的受力特性展开研究。计算结果表明:该场地液化等级被判定为严重,且地基液化对风机桩筏基础的水平向受荷响应影响较大;风机基础变形受多遇地震工况控制,承载力是受极端荷载工况控制,地基液化对风机基础竖向变形和倾斜的影响较小,主要影响水平位移。The foundations for tall wind turbines are normally subject to high horiontal loads and overturning moments due to wind load.In earthquake-prone zone,the ground liquefaction could lead to reduction of lateral capacities of the piled foudnations,which shall be taken into account in the foundation design.In this paper,the liquefaction is firstly assessed using the China Code for the ground of a wind farm in Henan Province that is located at the I river terrace of the Yellow River and prone to earthquake.Then,for the liquefaction-prone ground and improved ground,the piled raft foundations are analysed using the developed codes incorporated into the program FDOW by Tongji Qimstar Technology Co.Ltd.The results indicate:(1)for the liquefied ground,the lateral capacity of the piled raft foundation decreases significantly;(2)the deformation of piled raft foundation is governed by the load case of minor earthquake,while the capacities of piles are controlled by the extreme load case;(3)ground liquefaction imposes prominent impact on the lateral displacement rather than vertical deformation and rotation.

关 键 词：地基液化 桩筏基础 风机 

分 类 号：TM614[电气工程—电力系统及自动化] TU476[建筑科学—结构工程]