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青藏高原多年冻土是地质历史时期高海拔寒冷气候条件下的产物,也是青藏铁路建设的三大难题之一;而多年冻土工程地质特征及其评价工作是作出合理、可靠的工程设计的基础。结合青藏铁路沿线多年冻土区的15个地形地貌分区,在青藏铁路多年冻土区选择了70个典型断面进行了地质勘查,采用地质钻探和室内试验相结合的方法,研究了各区的工程地质特征并对其工程地质类型进行了评价。研究表明:青藏铁路多年冻土区冻土类型多样,高含冰量冻土、厚层地下冰广泛分布,不同区段地温差异性较大,工程地质条件复杂多变,良好、一般、不良和极差的工程地质区段交错分布。
Permafrost in the Qinghai-Tibet Plateau is a product of high altitude and colder climatic conditions during geological history and one of the three major challenges in the construction of the Qinghai-Tibet Railway. The engineering geological characteristics and evaluation of the permafrost are the basis for reasonable and reliable engineering design . Based on the 15 topographic features of the permafrost region along the Qinghai-Tibet Railway, 70 typical sections were selected for geologic prospecting in the permafrost region of the Qinghai-Tibet Railway. By means of a combination of geological drilling and laboratory tests, the engineering geology Characteristics and its engineering geological types were evaluated. The results show that the permafrost regions in the Qinghai-Tibet Railway have a wide range of types of permafrost, with high ice content permafrost and thick layer of underground ice, with large differences in geothermal temperature in different sections, complicated and changeable engineering geological conditions, good, fair, bad and very poor The engineering geological section staggered distribution.