多年冻土区道路工程病害类型及特征研究

发布时间：2018-05-31 18:19

本文选题：青藏工程走廊 + 多年冻土区　；参考：《防灾减灾工程学报》2014年03期

【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。
[Abstract]:Permafrost and permafrost regions bring great challenges to the construction and maintenance of engineering structures. Taking Qinghai-Tibet Highway and Qinghai-Tibet Railway as research objects, the main disease types and distribution characteristics of subgrade engineering, bridge engineering and culvert engineering are discussed systematically. Field investigation shows that 80% of roadbed diseases of Qinghai-Tibet Highway are caused by thawing settlement of permafrost, which are mainly caused by serious uneven settlement deformation and longitudinal cracks, and mainly occur on high embankment. These two diseases are closely related to the ground temperature and ice content of permafrost. The higher the ground temperature, the greater the ice content, and the more serious the disease is. The diseases of Qinghai-Xizang Highway Bridge are mainly related to ancillary works and superstructures, while culverts are mainly caused by frost heaving, thawing, debris flow deposition, ice slug and construction reasons. The results of field monitoring and investigation along the Qinghai-Tibet Railway show that the main diseases of railway subgrade are (uneven) settlement deformation of ordinary subgrade in high temperature frozen soil area, longitudinal crack, settlement deformation of transition section of road and bridge, The structure failure of cooling roadbed caused by wind and sand disaster and weathering of macadam material. In addition, permafrost geological phenomena such as frost heaving hills, ice vertebrae, ice mantle, and hot thaw lake ponds are widely distributed in the corridor of the Qinghai-Tibet project. When the above-mentioned bad geological phenomena are close to the project, they will pose a threat to the stability of road projects. Some engineering diseases may occur when it is serious.
【作者单位】：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;中交第一公路勘察设计研究院有限公司;甘肃省交通科学研究院有限公司;
【基金】：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
【分类号】：U418.6

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