构建铁路工程造价管理体系的思考

Construction methods of subgrade work in permafrost region of Qinghai-Tibet railway

青藏铁路多年冻土区路基工程具有海拔高、气压低、空气稀薄、气候严寒、地质条件和水质条件复杂，以及生态环境脆弱等特点，其施工方法不同于一般低海拔非冻土地区路基施工方法。此文根据青藏铁路设计施工科研攻关成果和现场施工经验，对多年冻土区路基路堤、路堑及过渡段路基等工程施工方法进行分析论证，对今后多年冻土区工程建设有一定的参考作用。

The permafrost subgrade work of Qinghai-Tibet railway is characteristic of high altitude, low atmospheric pressure, rarefied air and cold climate with complicated geological and water quality conditions, of which the construction methods differ with those in generally low altitude and non-frozen soil subgrade elsewhere. Based on the R＆D achievements of and field experience in the design and construction of Qinghai-Tibet railway, this article performs a demonstration of the construction methods for the embankments, cuttings and transition sections of subgrade in the permafrost region, which is of a certain reference to the engineering construction in permafrost areas in the future.