陆地风电空心锥形基础地震响应特性分析  

Responses of cone-shaped hollow reinforced concrete foundation for onshore wind turbines to seismic loading

作　　者：李大勇[1,2] 胡靖彦 张雨坤 李强[3] LI Dayong;HU Jingyan;ZHANG Yukun;LI Qiang(Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation,Shandong University of Science and Technology,Qingdao 266590,China;College of Pipeline and Civil Engineering,China University of Petroleum,Qingdao 266580,China;Tai’an Audit Guidance Service Center,Tai’an 271000,China)

机构地区：[1]山东科技大学山东省土木工程防灾减灾重点实验室,山东青岛266590 [2]中国石油大学(华东)储运与建筑工程学院,山东青岛266580 [3]泰安市审计指导服务中心,山东泰安271000

出　　处：《山东科技大学学报（自然科学版）》2023年第1期57-68,共12页Journal of Shandong University of Science and Technology(Natural Science)

基　　金：国家自然科学基金项目(51078227);山东科技大学科研创新团队项目(2015TDJH104)。

摘　　要：空心锥形钢筋混凝土基础是一种新型陆地风电基础形式。为了丰富陆地风电基础抗震性能研究并将空心锥形基础推广至实际工程中,数值模拟研究了砂土地基中质量相等的空心锥形基础和圆形基础的地震响应特性,讨论了基础尺寸、上部荷载、地震动峰值加速度和地下水埋深等因素对基础加速度和位移响应的影响。研究表明:地震作用下空心锥形基础和圆形基础顶板中心处的加速度峰值差距较小,约为5%;锥形基础的沉降量始终低于圆形基础,降幅在4%~31.8%;空心锥形基础前侧的土体变形范围大于圆形基础,而土体隆起量最大值小于圆形基础,最大减少66%,地震作用下空心锥形基础调动了更多土体抵抗荷载,具有更高的承载力。增加锥形基础的径高比(基础顶面直径与高度之比)能够有效减少基础沉降和前侧土体变形。基础上部荷载与输入地震峰值加速度增大,基础沉降量显著增大,基础前侧土体的变形范围和隆起量也随之增大。基础顶板中心处的加速度放大系数随上部荷载与地震动峰值加速度的增大而减小,随地下水位埋深增加而增大。The cone-shaped hollow reinforced concrete foundation(CHRF)is an innovative foundation for onshore wind turbines.To enrich the research on the anti-seismic performance of onshore wind power foundations and promote the application of the CHRF to practical projects,this paper investigated the responses of the CHRF and the regular circular foundation to seismic loading by using numerical simulations.It explored the influences of the foundation sizes,up-structure load value,ground motion peak acceleration value,and water table on the foundation acceleration and motion behavior.Results show that the difference of the peak acceleration values between the CHRF roof and the circular foundation roof are within 5%.The maximum settlement of the CHRF decreases by approximately 4%~31.8%compared with the circular foundation under the same self-weight value.The deformation range of the soil in the front side of the CHRF is larger than that of the circular foundation,but the maximum soil upheaval value of the CHRF is smaller than that of the circular foundation,with the maximum decrease of 66%,indicating that the CHRF has higher bearing capacity because it can using more soil to resist the seismic loading.The settlement of the CHRF and the deformation of the front side soil can be effectively decreased by increasing the ratio of the foundation roof diameter to the foundation height.The settlement of the CHRF and the deformation range increases with the increase of the ground motion peak acceleration value and the up-structure load.The acceleration amplification factor decreases with the increase of the up-structure load and the ground motion peak acceleration value,but it increases with the increase of the water table.

关 键 词：陆地风电 空心锥形基础 地震荷载 地震响应 数值模拟 土体变形 

分 类 号：TU47[建筑科学—结构工程]