风电安装平台插桩过程的试验与理论研究

Experimental and Theoretical Investigations on Penetration Process of Offshore Wind Turbine Installation Platform

针对风电安装平台在多层土中的插桩过程,通过现场取样测试获取土壤的物理参数,并通过插桩试验得到其平均插桩深度,以此建立插桩过程的数值模型,对插桩阻力与深度的变化规律以及土壤的流动失效机制进行了研究。结果表明,经验法选取土壤弹性模量与实际相差较大,试验测出的平均插桩深度为7.3m;数值结果与试验结果吻合良好,证明了理论模型的正确性;土壤发生了表面隆起、空腔形成、壁面坍塌和土壤回流四种失效模式。

Aiming at the penetration process in the multilayer soil for the offshore wind turbine installationplatform, the physical parameters of the soil are obtained by the field experiments. The average penetrationdepth is evaluated according to the penetration test. Then, the numerical model of the penetration process isproposed. The distributing rules of the penetration resistance and the depth as well as the mechanisms of the soilflow failure are investigated. The results show that the soil elastic modulus evaluated by empirical methoddiffered greatly from its real value. The tested average penetration depth is 7.3m. The numerical result agreeswell with the corresponding experimental value, which proving the accuracy of the theoretical model. The failuremodes such as surface heave, cavity formation, wall collapse and soil back-flow appeares in the soil.