海上风电三筒导管架基础地基土的抗液化性能研究

NUMERICAL SIMULATION OF LIQUEFACTION RESISTANCE OF FOUNDATION SOIL OF THREE BUCKET JACKET FOUNDATION FOR OFFSHORE WIND TURBINE

针对海上风电三筒导管架基础开展振动台试验,主要研究地基土的超孔隙水压力和加速度,并利用有限元软件ADINA对海上风电三筒导管架基础地基土在地震作用下的动力响应进行数值模拟,将试验结果与数模结果进行对比,发现二者吻合较好。进一步选取3种不同烈度的地震进行有限元模拟,主要分析其超孔隙水压力和加速度的分布规律,结果表明三筒导管架基础筒内土体的抗液化性能高于筒外土体,筒壁底端附近为液化高风险区,三筒导管架基础的上部荷载作用及环箍效应对地基土的抗液化性能有提高作用。

The shaking table test is carried out for three bucket jacket foundation for offshore wind turbine,the excess pore water pressure and acceleration of the foundation soil are studied.The dynamic response of the soil under earthquake is obtained by using the finite element software ADINA.The test results are compared with the numerical simulation results,and it is found that they are in good agreement.Three test conditions with different seismic intensity are selected for simulation,and the distribution laws of excess pore water pressure and acceleration are analyzed.The results show that the anti-liquefaction performance of the soil inside the bucket is higher than that outside the bucket,and there is a high risk of liquefaction near the bottom of the bucket wall.The upper load and hoop effect of three bucket jacket foundation can improve the liquefaction resistance of foundation soil.