摘要:研究目的:某铁路地处柴达木盆地西北部，地貌总体为早期海湖相沉积的开阔平原，路基工程约占全线 94.52%。沿线约94%为盐渍土场地，因此路基型式主要为路堤，所需填料方量巨大，但合格填料极度匮乏， 远运合格填料投资巨大，不满足工程经济性的要求。为使铁路建设既能满足路基质量要求和工程安全，又能 节约投资，本文对几种填料选择方案进行研究，以确定最经济合理的方案。研究结论:（1)针对某铁路特殊的自然地理条件和气候特征，通过采用非盐渍土、改良盐渍土、盐渍土等 填筑路基方案的经济技术比选，最终采用盐渍土填筑方案进行路基工程设计；（2)通过借鉴我国相关铁路建 设的成功经验，采用毛细水隔断、提高路基压实标准、放缓边坡坡率等综合措施，保证铁路路基的安全稳定，并 可节约投资;（3)本研究成果可为我国高盐渍土地区铁路、公路等工程的建设提供参考。

Abstract: Research purposes: A railway is located in the northwest of the Qaidam Basin. The general landform is the early marine - lacustrine sedimentary open plain. The length of subgrade construction accounts for about 94. 52% of the whole line. About 94% along the railway is the saline soil，and the mainly form of the subgrade is embankment. The amount of filler required is huge, but the qualified filler is extremely scarce. Shipping qualified filler from the distance will lead to a diseconomy result. In order to build the railway，it can not only meet the requirements of subgrade quality and safety, but also can save the project investment. In this paper，several kinds of filler selection schemes are studied to determine the most economical and reasonable scheme. Research conclusions:(1) For the reasons of the special natural geographical conditions and climatic characteristics of the railway, through economic and technical comparison of several schemes，such as the non saline soil，the improved saline soil and saline soil, the design scheme of the saline soil of the subgrade engineering is finally adopted. (2) By drawing on the successful experience of China's railway construction，the comprehensive measures are used，such as partitioning capillary water， improving the subgrade compaction standard and slowing side slope ratio, to ensure the safety and stability of railway subgrade，and saving the investment. (3) The research results can provide references for the construction of railways，highways and other projects in high saline soil region in China.