盐沼泽腐蚀对公路桥梁桩基础竖向极限承载力影响的数值模拟研究  

Numerical Simulation and Research on the Vertical Ultimate Bearing Capacity Impact of Highway Bridge Pile Foundation in Salt Marshes Corrosion

作　　者：王富春[1] 姚贤华[1,2] 冯忠居[1] 刘宁 赵雄章 王克锦 韩石 郑扬 

机构地区：[1]长安大学公路学院,西安市710064 [2]华北水利水电大学土木与交通学院,郑州市450011 [3]青海省公路科研勘测设计院,西宁市810008 [4]青海省高等级公路建设管理局,西宁市810008 [5]云南省公路开发投资有限责任公司,昆明市650200

出　　处：《公路》2017年第1期60-66,共7页Highway

基　　金：国家自然科学基金青年基金项目;项目编号51209094;青海省公路交通科技项目;项目编号2014-07

摘　　要：依托在建的青海省德香高速公路盐沼泽区的桥梁工程,以MARC有限元软件为平台,采用室内腐蚀试验参数,构建盐沼泽区桥梁桩基受腐蚀有限元模型,分析不同桩长和桩径的情况下,桩基受腐蚀后的剥落厚度和腐蚀深度对桩基竖向极限承载力的影响。研究结果表明,桩基受腐蚀后其竖向极限承载力呈现降低趋势,相比桩基混凝土剥落厚度来说,桩基受腐蚀的深度对桩基竖向极限承载力的影响较大。研究结果还表明,剥落厚度不大于6cm时,增加桩长能够有效提高桩基竖向极限承载力;剥落厚度大于6cm时,增加桩径能够有效提高桩基竖向极限承载力。Based on the bridge engineering on the Delingha-Xiangride Highway which are built in salt marshes in Qinghai, the finite element model of the corrosion of highway bridge pile foundation in salt marshes is established by using the finite element analytical software MARC and the parameters provided by the indoor test, influences of the flaking thickness and corrosion depth after corrosion on the vertical ultimate bearing capacity of pile foundation were analyzed for different pile length and pile diameter. The results show that the ultimate bearing capacity appear a trend of decrease for the pile foundation of the corrosion, compared with the flaking thickness of pile foundation, the depth of the pile corrosion have more influences on the ultimate bearing capacity of pile foundation. The results also shows that the vertical ultimate bearing capacity of pile foundation could be improved effectively by increasing pile length, as the flaking thickness is no more than 6cm. Besides, the vertical ultimate bearing capacity of pile foundation could be improved effectively by increasing pile diameter, as flaking thickness greater than 6 cm.

关 键 词：桥梁工程 盐沼泽 桩基础 腐蚀 数值模拟 极限承载力 

分 类 号：U441.5[建筑科学—桥梁与隧道工程]