The circular helicoid pile (CH pile) is a new type of special-shaped pile that has been developed in Japan and South Korea in the past decade and has been widely used in the fields of construction, transportation, natural energy and agriculture due to its excellent compressive and pullout bearing performances. Consequently, this new type of pile has good engineering application prospects. However, as an innovative engineering structure, the CH pile is not widely known by geotechnical engineers worldwide. The geometric structure of the CH pile is similar to a circular helicoid in differential geometry. Therefore, the pile-soil interaction problem cannot be reduced to a plane strain problem or an axisymmetric problem in theoretical research. In view of this, dry silica sand was used as the model foundation in this study, and a model test device and method that can effectively reflect the installation process and loading-bearing service state of CH piles were developed. Under different installation methods, pile structures and foundation soil conditions, 90 model tests were carried out to evaluate the engineering performances of CH piles during the whole process of installation and bearing, including the installation performances during the installation process, the compressive bearing performances under axial compressive loading and the pullout bearing performances under axial pullout loading. Compared with steel sheet piles and steel pipe piles, CH piles have better engineering performance and more economic benefits from the aspects of installation, construction, recycling, timeliness of engineering application, and the relative relationship between bearing capacity and pile mass.

圆形螺旋桩（CH桩）是日本和韩国近十年来发展起来的一种新型异形桩，由于其在建筑、交通、自然能源和农业等领域有着广泛的应用。出色的抗压和抗拉轴承性能。因此，这种新型桩具有良好的工程应用前景。然而，CH桩作为一种创新的工程结构，在世界范围内的岩土工程师并未广为人知。CH桩的几何结构类似于微分几何中的圆形螺旋面。因此，桩土相互作用问题在理论研究中不能归结为平面应变问题或轴对称问题。鉴于此，本研究采用干硅砂作为模型基础，研制了一种能有效反映CH桩安装过程和承载使用状态的模型试验装置和方法。在不同的安装方式、桩结构和地基土壤条件下，进行了90次模型试验，评估了CH桩在安装和承载全过程中的工程性能，包括安装过程中的安装性能、轴向下的抗压承载性能。压缩载荷和轴向拉出载荷下的拉出轴承性能。与钢板桩、钢管桩相比，CH桩从安装、施工、回收利用、工程应用的及时性、