风力机扩展基础基底压力测试与平面度分析  

Base pressure monitoring and flatness analysis for wind turbine spread subgrade

作　　者：邓宗伟[1] 彭文春 高乾丰[3] 董辉[3] 朱志祥[4] 

机构地区：[1]湖南城市学院土木工程学院,湖南益阳413000 [2]中国电建集团中南勘测设计研究院有限公司,湖南长沙410014 [3]湘潭大学土木工程与力学学院,湖南湘潭411105 [4]中南大学土木工程学院,湖南长沙410075

出　　处：《岩土力学》2015年第9期2659-2664,2673,共7页Rock and Soil Mechanics

基　　金：国家自然科学基金资助(No.51308198);湖南省教育厅重点研究项目(No.14A024);中国水电顾问集团中南勘测设计研究院科技项目(No.YJ2012 26)

摘　　要：深入研究风力机扩展基础基底压力的变化和分布规律,对完善大尺寸、大偏心浅基础的设计理论和确保我国内陆山区风力机安全稳定地运营都有着重要意义。以内陆残坡积土地基上风力机扩展基础基底压力的现场测试结果为基础,分析了基底压力随时间的长、短期变化特性及分布规律。针对测试结果提出了实测基底压力平面度的概念,并基于平面度对基底压力的规范公式进行了修正。分析表明,基底压力的大小及分布情况与风速和运行工况有密切关系,其分布可能为近似梯形或抛物线形;风轮旋转、机舱振动及风的随机性都会引起基底压力的动态变化,设计计算时不能完全忽略;实测基底压力的分布形态与理想平面分布存在差距,用现行规范对风机基底压力的最大值和最小值进行计算时,建议分别乘以1.2和0.8的修正系数。It is crucial to determine the evolution and distribution of the base pressure of wind turbine spread in designing the large-scale and large eccentric shallow foundations and ensuring the safe and stable operation of wind turbines in the mountain areas. Based on the measured data of the base pressure of wind turbine spread subgrade on an inland residual soil, the long-term and short-term changes and distributions of the base pressure are analyzed. A concept of the flatness of measured base pressure is defined according to the testing results, and the formulation from the building code is modified according to the calculated flatness of measured base pressure. It is shown that the values and distribution of the base pressure have a close relationship with wind speed and operating conditions, and the distribution of the base pressure can be represented by a trapezoid or a parabola. It is also shown that the variations of the base pressure with rotor rotation, cabin vibration or wind randomness should not be completely ignored. There is a disparity between the distribution of the measured base pressure and the ideal plane distribution. When the current code is used to calculate the maximum and minimum of wind turbine base pressure, correction factors of 1.2 and 0.8, respectively, are suggested.

关 键 词：风力发电 基底压力 现场测试 规范公式 扩展基础 平面度分析 

分 类 号：TU476.1[建筑科学—结构工程] TU413.6[建筑科学—土工工程]