青藏公路高温高含冰量多年冻土地区以桥代路工程研究

Study on Replacing Road with Bridge in Warm and Ice-rich Permafrost Regions along Qinghai-Tibet Highway

在青藏公路以桥代路的试点工程中,通过对桥梁桩基温度场及变形变化规律的研究,分析了以桥代路在高温高含冰量多年冻土地区的应用效果。研究表明:以桥代路的桩周冻土虽然需要较长时间才能回冻,但桩周冻土恢复热平衡后,可保持多年冻土的热稳定性,桥梁桩基的变形量微小,且稳定可靠。作为一项前瞻性研究,为青藏高速公路建设储备了技术资源,并指导了G214线高速公路的设计。对多年冻土地区的高速公路设计、施工具有重要的意义。

As regards the pilot project of replacing road with bridge along Qinghai-Tibet Highway, the application of such replacement in warm and ice-rich permafrost regions was analyzed through the research on change law of temperature field and deformation of the bridge pile foundation. The result shows that although permafrost around the pile foundation takes long time to be refrozen, it could keep the thermal stability after recovering to thermal balance, and the pile foundation was deformed slightly, staying stable and reliable. As a perpective study, it reserved technical resource for the construction of Qinghai-Tibet Highway and guided the design of G214 Highway, which has a significant meaning for design and construction of highway in permafrost regions as well.