腐蚀环境中混凝土桩基耐久性研究进展

发布时间：2019-03-04 18:18

【摘要】：腐蚀环境中地下混凝土结构的耐久性问题一直是国内外研究的热点问题之一.针对海洋和近海氯盐侵蚀环境与内陆盐湖和盐碱地硫酸盐侵蚀环境中地下混凝土结构的耐久性问题,分别从混凝土侵蚀机理、侵蚀性离子扩散机制、钢筋锈蚀机理、混凝土强度和刚度损伤等几个方面总结和归纳了当前国内外的研究现状,探讨了氯盐侵蚀环境和硫酸盐侵蚀环境中地下混凝土结构的损伤特性和劣化机制.在此基础上,考虑PHC预制管桩和现浇钻孔灌注桩的制作养护工艺,分别论述了海工环境中水平受荷PHC管桩和盐渍土环境中竖向受荷钻孔灌注桩的侵蚀劣化机理,进而结合海工环境中水平受荷PHC管桩和盐渍土环境中竖向受荷钻孔灌注桩的承载机制,探讨了各自承载特性的退化规律,总结了海工环境中水平受荷PHC管桩和盐渍土环境中竖向受荷钻孔灌注桩寿命的预测方法.最后,基于当前腐蚀环境中钢筋混凝土桩基耐久性研究现状,笔者根据自己的见解提出了今后的研究思路和方向,以期为腐蚀环境中和复杂应力条件下钢筋混凝土桩基的耐久性研究以及今后相应规范的制定提供一定参考.
[Abstract]:The durability of underground concrete structures in corrosive environment has been one of the hot issues at home and abroad. In view of the durability of underground concrete structures in marine and offshore chloride erosion environments and sulfate erosion environments in inland salt lakes and saline-alkali lands, the corrosion mechanism of concrete, the diffusion mechanism of erosive ions, and the corrosion mechanism of reinforcement are discussed. The research status of concrete strength and stiffness damage at home and abroad is summarized and summarized. The damage characteristics and deterioration mechanism of underground concrete structures in chloride erosion environment and sulfate erosion environment are discussed. On this basis, considering the manufacture and maintenance technology of PHC prefabricated pipe pile and cast-in-place bored cast-in-place pile, the erosion deterioration mechanism of horizontal loaded PHC pipe pile and vertical loaded bored cast-in-place pile in marine environment and saline soil environment are discussed respectively. Combined with the bearing mechanism of horizontal loaded PHC pipe pile in marine environment and vertical loaded bored cast-in-place pile in saline soil environment, the degradation rule of each bearing capacity characteristic is discussed. The life prediction methods of horizontal loaded PHC pipe pile and vertical loaded bored cast-in-place pile in saline soil environment are summarized in this paper. Finally, based on the present research situation of durability of reinforced concrete pile foundation in corrosive environment, the author puts forward the future research thinking and direction according to his own opinion. In order to provide some reference for the study of durability of reinforced concrete pile foundation in corrosive environment and under complex stress conditions and the formulation of corresponding codes in the future.
【作者单位】：岩土及地下工程教育部重点实验室(同济大学);同济大学地下建筑与工程系;
【基金】：国家自然科学基金(51178341,41772290)
【分类号】：TU473.13

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