Structure and Construction Method of Coarse Saline Soil Embankment for Ballastless Track at 250-350km/h

Abstract

The invention relates to a coarse-grained saline soil roadbed structure of a ballastless track with the speed being 250-350 km / h and a construction method. The arching and sinking deformation of an embankment is effectively controlled, it is ensured that salt expansion, melting sinking and compression deformation of the embankment meet the design requirement of a high-speed ballastless railway, and the technical problem caused when coarse-grained saline soil serves as a high speed railway embankment padding face is effectively solved. An embankment structure is composed of an embankment body lower structural layer, an embankment body upper structural layer, a foundation bed bottom layer and a foundation bed surface layer which are sequentially paved above a foundation from bottom to top; the embankment body lower structural layer, the embankment body upper structural layer and the foundation bed bottom layer are constructed through the coarse-grained saline soil, and the foundation bedsurface layer is constructed through non-saline soil; and the soluble salt content of the coarse-grained saline soil of the embankment body lower structural layer, the embankment body upper structural layer and the foundation bed bottom layer meets the requirements in the following table.

Description

technical field [0001] The invention relates to the technical field of high-speed railway ballastless track embankment, in particular to a structure and a construction method of a ballastless track embankment with a speed of 250-350km / h. [0002] technical background [0003] Saline soil is a general term for a type of soil with different degrees of salinization, which is widely distributed in arid, semi-arid and coastal areas of various countries. Saline soil generally includes coarse-grained saline soil and fine-grained saline soil. Coarse-grained saline soil has better mechanical properties and has been used as embankment filler in expressway construction; but as high-speed railway embankment filler, especially The application of ballastless track embankments is extremely rare worldwide. [0004] In saline soil areas, the high-speed railway line inevitably passes through the saline desert area, and the high-quality embankment filler without salt along the line is extremel...

AI Technical Summary

Problems solved by technology

[0004] In saline soil areas, the high-speed railway line inevitably passes through the saline desert area, and the high-quality embankment fillers without salt along the line are extremely scarce, and the long-distance transportation of high-quality embankment fillers without salt or rocks will increase the project investment dramatically. However, , saline soil has adverse engineering characteristics such as salt swelling, dissolution, erosion, etc., which can easily cause arching or subsidence on the top of the embankment to exceed the limit

Images