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青藏铁路多年冻土地基输电塔热棒桩基稳定性试验研究

ISSN号：1000-6915
期刊名称：《岩石力学与工程学报》
时间：0
分类：TU44[建筑科学—岩土工程;建筑科学—土工工程]
作者机构：[1]兰州交通大学甘肃省道路桥梁与地下工程重点实验室,甘肃兰州730070, [2]兰州交通大学土木工程学院,甘肃兰州730070
相关基金：国家自然科学基金资助项目（51268033）; 长江学者和创新团队发展计划资助项目（IRT1139）; 兰州交通大学青年科学基金资助项目（2013030）

关键词：土力学, 桩基础, 青藏铁路, 多年冻土, 热棒, 温度场, soil mechanics, piled foundation, Qinghai—Tibet railway, permafrost, thermosyphon, temperature field

中文摘要：

青藏铁路建设中输电塔穿越多年冻土地区,冻拔破坏在多年冻土桩基础中普遍存在,为研究热棒应用于输电塔桩基础的效果,在青藏铁路望不段设置热棒桩基试验段工程。结合此试验段对输电塔热棒桩基进行持续2年的现场试验和观测,获得设置热棒和未设置热棒桩基的桩周地温场、桩顶变形规律、地温曲线、负积温、冻土上限变化。观测结果表明：热棒桩基础降温效果显著,降低了桩基础的冻拔量,其稳定性明显好于普通桩基础。

英文摘要：

Power transmission towers along Qinghai—Tibet Railway line ran across permafrost regions. Frost uplifting failure of pile foundation is a prevail problem in permafrost regions. The Wangbu section in Qinghai—Tibet railway was selected as a test section for studying the application effect of thermosyphons in piled foundation of power transmission tower. Combining with the test section the field test and observation for the piled foundation with thermosyphons had been continued for two years. The changing rules of ground temperature field around pile,deformation at the top of piles,curves for ground temperature,negative accumulated temperature and permafrost table are obtained for both piled foundation with and without thermosyphons. The observed results show that in the piled foundation with thermosyphons the cooling effect is obvious,the frostuplifting amount can be decreased,and the stability is better than that of the common piled foundation.