Expansive soil cut slope support structure and construction method thereof

Abstract

The invention relates to an expansive soil cut slope support structure and a construction method thereof, in particular to the field of highway and railway cut slope protection of expansive soil regions. The expansive soil cut slope support structure comprises a rigid supporting system, a flexible protection system and a waterproof and draining system. The rigid supporting system comprises a lame retaining wall arranged on an expansive soil cut slope and a retaining wall foundation; the flexible protection system comprises a lattice beam arranged on the expansive soil cut slope, an anchor rod, a flexible net-shaped geogrid laid on the slope surface and a plant cover planted on the slope surface; and the waterproof and draining system comprises an intercepting ditch or drainage ditch arranged at the top of the slope, a permeable layer positioned behind the retaining wall, a drainage ditch and a drainage seepage ditch positioned below the drainage ditch. The slope surface is supported through a flexible supporting system, and in comparison with a rigid supporting method of fully laying a mortar rubble structure on the slope surface, the construction cost is reduced by over 20%, and the construction period is greatly reduced; and expansive force generated when expansive soil is met with rainwater and expands can be effectively released.

Description

technical field [0001] The invention relates to an expansive soil cutting slope support structure and a construction method thereof, in particular to the field of road and railway cutting slope protection in expansive soil areas. Background technique [0002] Expansive soil is mainly composed of strongly hydrophilic clay minerals montmorillonite and illite. It is a highly plastic cohesive soil with expansive structure, multiple cracks, strong expansion and contraction, and strength attenuation. It is also a typical unsaturated soil. . It is widely distributed in the world, and it is mainly distributed in more than 20 provinces and autonomous regions such as Hubei, Shaanxi, Yunnan, Guangxi, and Henan in my country, and it is mainly formed by residual deposits or residual slope deposits. Expansive soil brings harm to human engineering activities, and its strength attenuation characteristics caused by repeated expansion and contraction deformation due to water absorption and l...

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Problems solved by technology

Therefore, the stability and protection of expansive soil cutting slopes has become a difficult and unavoidable problem in engineering practice.

[0003] Through literature search, there are many structures and forms used to deal with expansive soil slopes, such as replacement of filling soil, improvement of expansive soil, slope protection with full mortar masonry rubble, retaining wall at the slope foot, greening slope after slowing slope ratio, adding Reinforced soil slope protection, rainwater seepage prevention and other measures and methods, but according to the actual situation of the project, it is found that the replacement of filling soil or improved soil will increase the project cost, and the construction period will be longer; Moreover, after a period of use, there will be arching and cracking of the slope rocks, and the slope will collapse after a long time; the retaining wall structure at the foot of the slope alone cannot effectively deal with the expansive soil slope, and the cost of the reinforced soil retaining wall for slope protection is too high

Some of the above treatment methods are not based on the expansive soil slope failure mechanism, landslide characteristics and expansive soil engineering characteristics, or the treatment method is too expensive and the construction period is too long

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