【摘要】 研究目的:微型桩应用时间较短,其防腐耐久性问题并未大量显现,现有国内规范中还未有相关条款。边坡工程中的微型桩腐蚀包括钢筋和桩体砂浆的腐蚀两方面。本文以工程应用为出发点,通过室内干湿循环腐蚀试验和普通加载试验,研究不同腐蚀程度的微型桩与岩土体的粘结性能及其受弯断裂破坏形态。研究结论:通过试验研究得出以下结论:(1)水灰比小、灰砂比大的微型桩与桩周土的粘结能力较好,对腐蚀的抵抗能力也较强;(2)通过对钢筋物理隔离的方法,可以优化微型桩的应力分布,减少较大裂缝产生,提高微型桩的承载能力;(3)经研究提出的铁路边坡工程中微型桩耐久性设计中关于设计使用年限、桩径以及保护层的建议,为设计提供参考。更多还原

【Abstract】 Research purposes: The application time of micro- pile is not long enough to discover the problem of anti-corrosive durability. There is also no relevant terms yet about the anti- corrosive durability of micro- pile in the current codes. There are two ways of micro- pile corrosion: the reinforcement corrosion and the cement mortar corrosion of piles. For the engineering application,the laboratory corrosion test of dry and wet cycle and the general loading test were conducted. The bond behavior with rocks and the bending fracture failure of micro- pile under different corrosion degree were studied.Research conclusions:The test results show:(1) The micro- pile with smaller water cement ratio and larger cement sand ratio,was performed better bond behavior and corrosion durability.(2) The stress distribution was optimized in order to reduce the large cracks by separated reinforcement by physical isolated method. This also improved the bearing capacity of micro- pile structure.(3)Based on the research,several suggestions of micro- pile corrosion durability were proposed,such as design working life,pile diameter and protective layer,and were recommended for design reference.更多还原