阿里机场盐渍化冻土工程地质特性及其改良

Research on engineering geological properties and transformation measurements of salted frozen soil of the Ali airport

阿里机场位于西藏阿里地区,是我国海拔第二高机场,处于高原寒带季风干旱气候区,年平均气温在0℃以下。由于机场场区地下水埋深浅,且含有一定盐分,形成了盐渍化季节性冻土。盐渍化季节性冻土工程地质性质独特,在我国机场建设历史上尚属首次发现,在设计和施工中没有类似工程经验可以借鉴。本文通过对盐渍化季节性冻土工程地质特性的研究,提出了有针对性的技术处理方案,并运用到工程建设中。机场经两年多的运行和相关监测验证,该技术方法成功解决了机场场道地基盐渍化季节性冻土问题,从而为我国类似高原机场建设积累了宝贵经验。

Ali airport is located in the Ali region of Tibet, which is the second highest airport above sea level in China. It lies in a unique climate zone in the cold plateau with monsoon and drought. The annual average temperature in most of the time of the year is below zero degree centigrade. Groundwater in the shallow aquifer contains salt, forming the salted frozen soil foundation at the airport. The engineering geological properties of the salted frozen soil are unique. There is not any experience in design and construction of airport of this kind in the history of Chinese airport construction. By examining the engineering geological properties, this paper puts forward a series of targeted treatment schemes applied to engineering construction. The airport is now safely operated and monitored by related tests for more than two years. It is proven that these technical schemes have successfully shoveled the problem of seasonal salted frozen soil in the airport runway foundation. The results also provide experience for similar airport construction in the plateau area of China.