岩土工程学报2011，Vol.33Issue(8)：1178-1184,7.
大宁河特大拱桥拱座-基岩长期稳定性研究
Long-term stability of arch support and bedrock of Daning River Bridge
摘要
Abstract
The arch support at Wushan end of Daning River Bridge is constructed on weathered solution-collapse breccias,which is soft and prone to creep.Evaluation of long-term stability of arch support and breccias is of great importance for the security of service of Daning River Bridge.Based on the laboratory creep test results of weathered solution-collapse breccias,a creep constitutive model is established and the parameters are proposed.Using the creep model,the long-term evolution of stress and deformation of the arch support and breccias is analyzed by means of the 3D finite element method（FEM）.The openings and shear stress between the contact surface of arch support and breccias are studied.Numerical results show that：（1） the creep of breccias can cause local tensile stress concentration on thrust resistance piles;（2） the arch support and bedrock show compatible deformation during long-term creep,and the opening of the contact surface is very small.In addition,the shear stress in most part of the contact surface is less than 0.1 MPa.This study may be helpful for the design of arch support and long-term maintenance of the slope.关键词
大宁河大桥/拱座/接触面/蠕变/长期稳定性Key words
Daning River Bridge/arch support/contact surface/creep/long-term stability分类
建筑与水利引用本文复制引用
杨建平,陈卫忠,于洪丹,谭贤君..大宁河特大拱桥拱座-基岩长期稳定性研究[J].岩土工程学报,2011,33(8):1178-1184,7.基金项目
国家自然科学基金项目 （）
