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Cone-shaped hollow flexible reinforced concrete foundation (CHFRF) - Innovative for mountain wind turbines

机译：圆锥形空心柔性钢筋混凝土基础（CHFRF）-山区风力涡轮机的创新

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摘要

This paper presents an innovative type of mountain wind turbine foundation, namely, the cone-shaped hollow flexible reinforced concrete foundation (CHFRF). It consists of a top plate, a base plate and a side wall that are made of reinforced concrete. The cavity of the CHFRF is filled with rubble and soil directly from the excavation for the CHFRF, which means that it can absorb the spoil. A rubber layer is placed beneath the CHFRF to increase the foundation flexibility to resist cyclic and dynamic loadings and to increase the bearing capacity. The great advantages of the CHFRF are the reduction in the usage of concrete and steel and the protection of the vegetation around the wind turbine, compared with conventional mountain wind turbine foundations that are solid structures. It is verified through model tests and a numerical simulation that the CHFRF can provide higher lateral bearing capacity in comparison to the regular circular gravity-based foundation under the same foundation diameter and height, and that the bearing capacity is increased by approximately 33.5% accordingly. It is also found that the rubber layer can effectively reduce the accumulated rotation of the CHFRF under cyclic loading. The accumulated rotation of the CHFRF with a rubber layer having a thickness of 4 mm is decreased by about 50% compared to that of the CHFRF with a rubber layer having a thickness of 2 mm. In addition, the volume of concrete used for the CHFRF is only one-fifth of that used for the circular gravity-based foundation. Therefore, the CHFRF outperforms regular mountain wind turbine foundations. (C) 2019 Production and hosting by Elsevier B.V. on behalf of The Japanese Geotechnical Society.
机译：本文提出了一种创新型的山区风力发电机基础，即锥形空心柔性钢筋混凝土基础（CHFRF）。它由用钢筋混凝土制成的顶板，底板和侧壁组成。 CHFRF的空腔直接从CHFRF的开挖中充满了碎石和土壤，这意味着它可以吸收弃土。在CHFRF下方放置一个橡胶层，以增加基础的柔韧性，以抵抗周期性和动态载荷并增加承载能力。与传统的坚固固态山地风力发电机基础相比，CHFRF的巨大优势在于减少了混凝土和钢材的使用并保护了风力发电机周围的植被。通过模型测试和数值模拟证明，在相同的基础直径和高度下，CHFRF与常规的圆形重力基础相比，可以提供更高的侧向承载能力，并且承载能力相应地增加了约33.5％。还发现橡胶层可以有效地减少循环载荷下CHFRF的累积旋转。与具有2mm厚度的橡胶层的CHFRF相比，具有4mm厚度的橡胶层的CHFRF的累积旋转减少了约50％。此外，用于CHFRF的混凝土体积仅为基于圆形重力基的混凝土体积的五分之一。因此，CHFRF优于常规的山区风力涡轮机基础。 （C）2019年由Elsevier B.V.代表日本岩土工程学会制作和主持。

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