高原高寒多年冻土区的桥梁施工技术

针对青藏高原高寒、缺氧等特点,以及青藏铁路多年冻土的特殊性与复杂性,通过实践与理论讨论,详细地制订出了在高原高寒多年冻土区桥梁工程施工中的技术措施和施工工艺.在青藏高原的多年冻土区,由于桥梁及工程建筑物的修建,将改变原有的温度场、应力场、以及冻土层的水热交换.因此,选择合理的施工季节、施工方法和采取必要的施工措施,是减少施工对多年冻土热扰动的必要措施.

Engineering Techniques for Bridge Works in Permafrost Regions of the Tibetan Plateau

Technology measures and engineering techniques for the bridge works in the high and cold regions of the Tibetan Plateau are presented in this paper,which are based on practice and theoretical analyses,analyzing various kinds of circumstances of the plateau,such as high altitude,oxygen lacking,very low temperature and complicated climate,and considering the particularity and complexity of permafrost along the Qinghai-Tibet railway.In permafrost regions of the plateau,the bridge works will change the temperature field,stress field in permafrost and the exchanges of water and heat within permafrost.So,to select a reasonable work season and construction method,and to adopt some compulsory engineering techniques are necessary for reducing heat disturbance in the permafrost regions.