基于三维非线性有限元方法的高压输电塔“桩-土-承台”共同作用特性研究

Study on Transmission Tower Pile-soft-pile Caps Interaction Characteristics Based on Three-dimensional Nonlinear Finite Element Method

大跨越高压输电工程给原来稳定安全的大堤带来安全隐患,主要表现为在各种复杂荷载作用下,桩-土-承台接触带产生不协调的位移,桩侧土体会出现裂缝展开,这种裂缝可能会沿桩身贯穿堤基的相对隔水层,形成潜在的渗流通道。基于三维非线性接触有限元计算方法,研究桩-土-承台在复杂荷载作用下桩侧土体的开裂特性,预测桩侧土体裂缝开展宽度及深度,以便采取相应的工程措施,确保堤防长期安全稳定。

Due to the construction of span transmission tower,the cap and pile group usually bear complicated load which leads to gap extending on the interface between the piles and soil.Potential channels of seepage flow could be formed so as to endanger the safety of the dike.A three-dimensional nonlinear contact finite element method is employed to simulate the crack characteristics of pile group under complicated load.At the same time,crack extending between the piles and surrounding soil is also calculated to ensure the long-term stability for dike.