大型风机扩展式基础地基弹性模量敏感性分析

Sensitivity Analysis of Elastic Modulus of Subgrade for Large Wind Turbine Spread Foundation

针对地基条件差异对大型风机扩展基础受力和沉降变化的影响,以辉腾锡勒风电场大型风电机组基础工程为例,考虑基础钢环与混凝土间及混凝土与地基间的非线性接触,基于ANSYS平台建立了不同地基弹性模量多工况下的风力发电机基础三维有限元模型。计算结果表明,当地基弹性模量为100MPa时,风机基础底面最大沉降值为10.277mm,倾斜率为0.000 4,满足现行规范对地基变形的要求;地基弹性模量大于1 000MPa之后,风机基础底部与地基间脱开趋势加剧;当地基弹性模量小于100MPa时,建议设计时使用桩基础。

Aiming at impact of difference of subgrade on stress and settlement of spread foundation for large wind tur- bine, taking the wind power project in Huitengxile for an example, three-dimensional finite element model of different e- lastic modulus of the subgrade is established by considering the nonlinear contact between the stub of tower structure and the foundation concrete and the contact between the concrete foundation and subgrade based on ANSYS platform. The calculation results indicate that when the elastic modulus of the subground is 100 MPa, the maximum settlement value of the basic bottom surface of spread foundation is i0. 277mm, the slope rate is 0. 0004, which satisfy requirements of the design code; when the elastic modulus of the subground is greater than 1000 MPa, the trend to uncouple among the basic bottom of spread foundation and subground aggravates; when the elastic mould amount of subground is smaller than 100 MPa, the pile foundation is suggested to be used.