土工格栅在青藏铁路多年冻土区路基工程中的应用

Application of Geotechnical Lattices to Subgrade Engineering in the Permafrost Regions of the Qinghai-Tibet Railway

以青藏铁路多年冻土区清水河冻土加筋路堤试验段为例 ,对土工格栅在铁路路基工程中的应用原理及设计思路进行了叙述 .通过对路基裂缝进行调查、分析和比较 ,土工格栅对加强路基整体稳的作用是肯定的 .在多年冻土区路堤中 ,使用土工格栅加筋层对防止路堤纵向裂缝的产生。

This paper, taking the test section of reinforced permafrost embankment in Qingshuihe in the permafrost region along the Qinghai-Tibet Railway as an example, presents the application principle and design idea of geotechnical lattices used in railway subgrade engineering. The effect is estimated of the geotechnical lattices used in subgrade engineering through investigation, analysis and comparison on subgrade cracks.\;As a kind of geotechnical synthetic materials, the geotechnical lattices are widely used in the civil engineering of highway, railway and airport. In railway engineering, it is mainly used for embankment reinforcement, reinforced-earth retaining wall and transition sector treatment of viaduct, etc. Of the Qinghai-Tibet Railway there are 550 km passing permafrost regions and about 110 km passing extremely unstable high-temperature frozen soil sections. The overall stability of soil can be enhanced by means of laying the geotechnical lattices at a certain range on the upper part of embankment. Through comparison and analysis, it is revealed that the reinforced layer by geotechnical lattices used in embankment in permafrost regions has obvious effect on preventing the embankment from longitudinal cracks and restraining lateral cracks.