Expansive soil embankment structure improved and reinforced by sandwich method and construction method

Abstract

The invention discloses an expansive soil embankment structure improved and reinforced by a sandwich method and a construction method. The structure comprises a subgrade bed surface layer, a subgrade bed bottom layer and a subgrade body in sequence from top to bottom, wherein the subgrade body is composed of an expansive soil filling region and an improved soil filling region which are distributed at interval; anti-running slipping grids are arranged on side slopes at two sides of the subgrade body; transverse water drainage slopes are arranged at the bottoms of the subgrade bed surface layer and the subgrade bed bottom layer, and the bottom of the expansive soil filling region in the subgrade body; an inclined water discharge hole is buried in the transverse water drainage slope of the expansive soil filling region; a reversed filtering layer is arranged at the periphery of the inclined water discharge hole. According to the expansive soil embankment structure disclosed by the invention, a technical problem that expansive soil cannot be used for carrying out embankment filling is solved, and the quality meets the requirements after embankment filling construction of an expansive soil region is carried out; the improvement cost can be greatly reduced, and a flow of a construction process is simplified; large-scale construction and continuous filling are convenient to carry out, and the aims of reasonable technology and reduced cost are realized; the expansive soil embankment structure has a wide popularization and application value.

Description

technical field [0001] The invention relates to the field of railway embankment engineering, in particular to an expansive soil embankment structure improved and reinforced by a sandwich method and a construction method. Background technique [0002] Expansive soil is often referred to as disastrous soil in engineering circles. Its main characteristics are: expansion and contraction, cracks, and over-consolidation. The complex interaction of these three characteristics makes its engineering properties extremely poor. Cause huge harm, and its harm is often multiple, repeated and long-term potential. [0003] my country is one of the countries with the widest distribution of expansive soils, especially in the middle and lower reaches of the Yangtze River and the Yellow River, as well as the southern coastal and southwest regions, where expansive soils are most developed and widely distributed. Taking the newly-built Menghua Railway as an example, about 211.3km of expansive so...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide an improved and reinforced expansive soil embankment structure and construction method by interlayer method, so as to solve the problem that part of the expansive soil can not be used to fill the roadbed in the rainy season, and the swelling caused by the change of the moisture content of the expansive soil filler shrinkage damage and other quality problems, the present invention can not only make the use of expansive soil to fill the roadbed construction meet the quality requirements, but also greatly reduce the cost of expansive soil improvement treatment, to achieve the purpose of reasonable technology and cost-effective, and the greater the embankment filling height, the The more it can reflect the economy of the subgrade structure

Images