基于变位方法的无底大圆筒结构稳定性研究

新型的无底大直径圆筒结构以其可直接嵌入地基而无需开挖的优势，在港口工程中得到广泛应用。但由于设计中采用经典的水工结构的稳定计算模型，导致一些实际工程出现了失稳破坏。基于沉入式大圆筒的工作机理，文中对传统稳定计算模型中结构倾覆转动点仅在基底的假设进行了改进，建立了吻合无底大圆筒结构并同时考虑水平位移、竖向位移、转角以及结构倾覆转动点随埋置深度变化的稳定性计算模型，基于临界破坏的模式，推导出了大圆筒的变位方程。该方程可以求得具体工况下竖向位移、水平位移、转角以及倾覆点高度。通过算例及工程实例验证了该模型的正确性及可行性。

Stability Study on Large Diameter Cylindrical Structure based on Displacement Method

More and more large-diameter cylindrical structures have been used in coastal engineering because this new structure can be embedded into ground directly without excavation. But the traditional hydro-structure stability computational model has been used in design, which causes some coastal engineering unstable failure. Based on the work mechanism of large diameter cylinder, This paper improves the hypothesis that rotational points are just at the basement in the traditional stability calculation model, establishes the anastomotic large cylinder structure and its stable calculation model which considers horizontal displacement, vertical displacement, turning angles and rotational points which changes with the depth buried. Based on the critical damage model, the displacement equation can be derived. The vertical displacement, horizontal displacement, angle and rotational point height can be obtained by the equation in certain work conditions. Through calculating examples and engineering example, it verifies the feasibility and validity of the model.