Protective structure for repairing unstable expansive soil side slope and construction method thereof

Abstract

The invention relates to a protective structure for repairing an unstable expansive soil slope, and belongs to the field of geotechnical engineering. The protective structure is composed of a rigid protective system, a flexible protective system and a drainage system, wherein the rigid protective system comprises a repaired retaining wall formed after cracks of an original retaining wall are filled, a gravity retaining wall arranged in front of the repaired original retaining wall and a plurality of prestressed pipe piles inserted into a soil body at certain intervals, the flexible protection system comprises backfill soil, a waterproof geomembrane and vegetation, the backfill soil is used for replacing expansive soil and forming a plurality of slope and platform combinations in a layering mode, the waterproof geomembrane is laid on a backfill soil platform, and the vegetation is planted on the slope face of the backfill soil, and the drainage system comprises branch drainage ditches arranged on the backfill soil platform, a main drainage ditch arranged at the toe of the backfill soil slope, drainage capillary tubes installed in grooves formed in the surface of the backfill soil slope and water drainage pipes penetrating through the repair retaining wall and the gravity retaining wall, the drainage capillary tubes introduce water into the branch drainage ditches, and the water drainage pipes introduce water into the main drainage ditch. According to the protective structure, the construction period is shortened, and the manufacturing cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, and in particular relates to a protective structure for repairing an unstable expansive soil slope and a construction method thereof. Background technique [0002] Expansive soil, also known as "expansive soil", is a kind of cohesive soil whose volume expands violently after soaking in water, and shrinks significantly after dehydration. characteristic. Expansive soils are widely distributed in the world. my country is one of the most widely distributed regions of expansive soils, distributed in Yunnan, Guizhou, Sichuan, Guangxi, Hebei, Henan, Hubei, Shaanxi, Anhui and Jiangsu. Because expansive soil itself is rich in hydrophilic minerals, it will show the characteristics of water absorption, swelling, softening, dehydration shrinkage, and cracking under the action of dry-wet cycle. Projects in the area often have problems such as slope slides, roadbed subsidence, and structural...

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Problems solved by technology

However, at present, the support structures for expansive soil slopes are mostly determined at the design stage, and the construction objects are mainly natural slopes. There is a lack of research on the repair and reinforcement of existing protective measures after slope disasters, and it is impossible to deal with problems that arise in actual projects.

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