| 多年冻土区道路工程病害类型及特征研究 |
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| 引用本文： | 穆彦虎,;马巍,;牛富俊,;刘戈,;张青龙.多年冻土区道路工程病害类型及特征研究[J].地震学刊,2014(3):259-267. |
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| 作者姓名： | 穆彦虎 ;马巍 ;牛富俊 ;刘戈 ;张青龙 |
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| 作者单位： | [1]中国科学院寒区旱区环境与工程研究所、冻土工程国家重点实验室,兰州730000; [2]中交第一公路勘察设计研究院有限公司,西安710075; [3]甘肃省交通科学研究院有限公司,兰州730000 |
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| 基金项目： | 国家重点基础研究发展项目（973）（2012CB026106、2016CB026101）;中国科学院西部之光人才培养计划“西部博士”项目（29Y429731）;冻土工程国家重点实验室青年基金项目（SKLFSE-ZQ-20）资助 |
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| 摘 要： | 多年冻土及多年冻土区恶劣的环境给工程构筑物的建设及维护带来了极大的挑战。以青藏工程走廊内的青藏公路、青藏铁路两大道路工程为研究对象,系统论述了其路基工程、桥梁工程、涵洞工程的主要病害类型及分布特征。现场调查显示,青藏公路80%的路基病害由多年冻土融沉所引起,主要表现为严重的不均匀沉降变形和纵向裂缝,且主要发生在高填方路基上。这两种病害与多年冻土地温及含冰量密切相关,地温越高,含冰量越大,病害越为严重。青藏公路桥梁工程的病害主要集中在附属工程及上部结构上,而涵洞工程病害则主要由冻胀、融沉作用、泥石流淤积、冰塞以及施工原因导致。青藏铁路沿线现场监测及调查结果表明,目前铁路路基病害主要为高温冻土区普通路基的（不均匀）沉降变形、纵向裂缝、路桥过渡段沉降变形、风沙灾害及块碎石材料风化引起的冷却路基结构失效等。此外,青藏工程走廊内广泛分布着包括冻胀丘、冰椎、冰幔、热融湖塘等不良冻土地质现象,当上述不良地质现象与工程接近时,会对道路工程的稳定性造成威胁,严重时可导致一些工程病害的发生。
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| 关 键 词： | 青藏工程走廊 多年冻土区 道路工程 工程病害 |
Study on Geotechnical Hazards to Roadway Engineering in Permafrost Regions |
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| Institution: | MU Yan-hu , MA Wei , NIU Fu-jun , LIU Ge , ZHANG Qing-long (1. State Key Laboratory of Frozen Soils Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China; 2. The First Highway Survey and Design Institute of China, Xi＇an 710075, China; 3. Gansu Provincial Communications Research Institute Co. , Ltd. , Lanzhou 730000, China) |
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| Abstract: | Frozen soil and harsh environment in permafrost regions present great challenges and result in lots of geotechnical hazards to permafrost engineering. The present paper systematically analyzes permafrost-related geotechnical hazards to roadway engineering （Qinghai-Tibet Highway （QTH） and Qinghai-Tibet Railway （QTR）） along the Qinghai-Tibet engineering corridor. Field investigations indicated that about 80 percent of embankment hazards to QTH were caused by thaw settlement, and mainly performed as significant differential settlement and longitudinal crack, especially on high embankment, and were severer when underlying permafrost is warmer and ice-rich. Geotechnical hazards to bridge along the QTH mainly occurred in affiliated structures and upper structures, while on culverts, hazards were mainly consequences of freezing-tha- wing actions, debris- and icing-flow and unreasonable construction method. Field monitoring and investigation showed that geotechnical hazards along the QTR included differential settlement of earthen embankment in warm permafrost regions, longitudinal crack, uneven settlement at embankment-bridge transition section, and hazards induced by aeolian sand disaster and rock shattering of crushed rocks on embankment. In addition, some permafrost-related geological phenomena, including frost mound, icing and ice mantle, thermokarst lake, widely developping within the corridor, will exert potential geotechnical hazards to roadway engineering. |
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| Keywords: | Qinghai-Tibet engineering corridor permafrost regions roadway engineering geotechnical hazards |
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