Qinghai-tibet railway permafrost wetland ground treatment technique

Abstract

The invention relates to a process method for treating a perenial frozen soil wetland foundation of the Qinghai-Tibet Railway. The Qinghai-Tibet Plateau is an area with widest area, largest thickness and lowest temperature of perenial frozen soil in an intermediate and low latitudinal band of the Northern Hemisphere, and the Qinghai-Tibet Railway is one of important foundational engineering of the Development of the West Regions in China; and as known from the investigation of main diseases of road foundations of railways in perenial frozen soil areas, the diseases caused by wetland sections account for 60 to 70 percent of the total diseases and severely influences normal operation of the railway and greatly increases the operation and maintenance expenditure of the road foundations. The invention aims to provide the process method for treating the perenial frozen soil wetland foundation of the Qinghai-Tibet Railway, which maintains the thermal stability of the road foundation, increases the bearing capability of the foundation and reduces thaw collapse and deformation of the road foundation. The process method treats the foundation by adoption of packing sedimentation by throwing stones, geotechnical pattern rooms and hydroceramic soil or geogrid and hydroceramic soil method, so as to guarantee the stability of the foundation and obviously improve the bearing capacity of the treated foundation.

Description

Technical field: [0001] The invention relates to the experimental research field of permafrost wetland foundation treatment technology, in particular to a permafrost wetland foundation treatment process method for the Qinghai-Tibet Railway. Background technique [0002] The area of ​​permafrost and seasonally frozen soil in my country accounts for more than 70% of the total land area, and the area of ​​permafrost alone is estimated to be about 215×10 4 km 2 , accounting for 22.3% of the total land area of ​​the country. As the plateau with the highest altitude and the widest distribution of permafrost in the world, the Qinghai-Tibet Plateau is the area with the widest permafrost area, the largest thickness and the lowest temperature in the middle and low latitudes of the northern hemisphere. Since the end of the Tertiary, especially since the Quaternary, the Qinghai-Tibet Plateau has been strongly uplifted, making its hinterland as high as 4500m above sea level. Its perma...

AI Technical Summary

Problems solved by technology

[0007] The Anduo section of the Qinghai-Tibet Railway distributes a wide range of permafrost slope wetlands. The frost heave changes greatly in this section, and the strength decreases rapidly after heat-thawing, and a large amount of water is stored, forming swampy wetlands. Moreover, there are lateral slopes in the foundation, and the water on the frozen layer will Flow along the slope direction, reduce the strength of the soil on the potential sliding surface, and seriously affect the stability of the railway embankment

Since the construction of embankments may lead to changes in the upper limit of frozen soil, it will also cause changes in the stability of the roadbed

[0008] From the investigation of the main diseases of the existing railways in the Northeast permafrost region and the embankment of the Russian Siberia-Baiya Railway, it can be known that the diseases caused by wetlands account for 60-70% of the total diseases. These diseases have seriously affected the normal operation of the railway and greatly Increased operation and maintenance expenditure of roadbed