陡坡段桥梁桩基研究现状及展望

Research Status and Forecast of Bridge Pile Foundation in Sloping Ground

随着我国山区高速公路、铁路建设的高速发展,桥梁桩基建造在陡坡地段的现象日渐增多,且陡坡段桥梁桩基承载机理复杂,故其设计计算逐渐引起广泛关注和重视,成为当前的研究热点之一.在其工程设计中,不仅要考虑桥梁上部结构传递的倾斜偏心荷载,还应考虑桩-坡非对称体系引起的附加土压力以及地基水平抗力折减效应.本文通过对国内外相关领域文献的综合分析,分别从承载机理、现场及模型试验方法、受力变形分析及其设计计算方法、施工技术和安全评价方法及加固处治措施四个方面详细阐述了当前研究现状,并指出了该领域今后的研究方向.

With the rapid development of highway and railway construction in mountainous areas in China,the phenomenon of bridge pile foundations built in sloping ground is growing daily,but the bearing mechanism of bridge pile foundations in sloping ground is complex.Therefore,the design and calculation of bridge pile foundations in sloping ground has gradually attracted wide attention and become one of the current research hotspots.In the engineering design of bridge pile foundation,the inclined and eccentric load transmitted from the bridge superstructure,the extra earth pressure caused by the pile-slope asymmetry system,and the reduction effect of lateral soil resistance should be considered simultaneously.Based on the comprehensive analysis of related literature at home and abroad,in this paper,the current research status of the bridge pile foundation is elaborated detailedly in four aspects:the bearing mechanism,the field and the model test method,the stress deformation analysis and design method,the construction technology,safety assessment method and strengthening processing measures.Furthermore,future research directions in this field are pointed out.