Expansive soil composite roadbed structure pattern and construction method thereof

Abstract

The invention discloses an expansive soil composite roadbed structure pattern and a construction method thereof. The expansive soil composite roadbed structure pattern comprises a bottom isolation layer, an expansive soil core filling area, an edge reinforcement and seepage prevention area, a geocell protection area, an upper embankment, a roadbed and a pavement structure layer. The expansive soilcomposite roadbed disclosed by the invention can form a closed waterproof or water-blocking system, external water is prevented from infiltrating into the expansive soil core filling area, the expansive soil core filling area is stable in humidity, and long-term performance stability of the expansive soil roadbed is guaranteed. Meanwhile, the roadbed structure pattern not only can utilize expansive soil along the line as a roadbed filler to the maximum extent, but also can overcome the defects that no available edge covering soil source exists around and chemical improvement pollutes the environment, and conforms to the ecological environmental protection concept.

Description

technical field [0001] The invention relates to an expansive soil composite roadbed structure type and a construction method thereof, belonging to the field of highway roadbeds. Background technique [0002] Expansive soil is a special soil rich in strong hydrophilic clay minerals, which swells when exposed to water, shrinks when dehydrated, and has poor engineering properties. It is widely distributed in my country. In the initial stage of high-grade highway construction in my country, expansive soil is often chemically modified by mixing cement, lime, and slag mixture. This requires high construction machinery and technology, poor environmental protection, and causes a substantial increase in engineering costs. In the mid-to-late 1990s, based on the basic principles of moisture retention and anti-seepage, physical improvement methods such as non-expansive clay / gravel soil covering (including interlayer), geogrid / geogrid edge reinforcement, and geotextile reinforcement bega...

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Problems solved by technology

[0004] The present invention aims to solve the problem of rational utilization of expansive soil as roadbed filler, considering the influence of the atmospheric environment and the depth of significant influence, and based on the basic principle of moisture retention and anti-seepage, a composite roadbed structure type of reinforced expansive soil and geocell ecological protection is proposed and its construction method

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