国道219协林藏布河谷活动沙丘形成机制及建设方案建议

The formation mechanism of the active dune and construction scheme suggestion in the Xielin Zangbu of national highway 219

国道219协林藏布河谷区地理环境独特,区内活动沙丘规模较大且成因复杂,分析其形成机制可在指导工程建设的同时,为类似工程积累经验。通过汇总调查获取的地层、气象、水文以及沙丘分布现状等资料,以形成沙丘的外部和内部因素为出发点,论述其形成机制,提出相应的建设方案。分析结果表明:区内活动沙丘的形成机制具有内部和外部因素循环互补的特点,在无法规避活动沙丘时应选择合理跨径的桥梁通过,以降低风沙灾害对公路建设的影响。

Xielin Zangbu River Valley of national highway 219 has a unique geographical environment.The scale of active sand dunes in the area is large and the causes are complex.The analysis of the formation mechanism of the sand dunes can not only guide the construction of the project,but also accumulate experience for similar projects.In this paper,the formation mechanism of sand dune is discussed and the corresponding construction scheme is put forward based on the collected data of stratum,meteorology,hydrology and sand dune distribution.The analysis results show that the formation mechanism of the active dunes in the area is characterized by the complementary circulation of internal and external factors.When the active sand dunes cannot be avoided,the bridge with reasonable span should be selected to reduce the impact of sand disaster on highway construction.