Recompaction and plant covering combined protection method for loose unsaturated soil slope shallow layer

A technology of vegetation coverage and loosening, which is applied in botany equipment and methods, excavation, infrastructure engineering, etc., can solve problems such as damage, high maintenance and renovation costs, difficult slope greening and ecological restoration, and achieve good durability and good Ecological restoration effect, effect of reducing rainfall infiltration

Active Publication Date: 2014-11-26
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above protection measures require a large amount of external materials such as stone and cement, and the formed slopes are difficult to be greened and ecologically restored. Moreover, as time goes by, mortar masonry, concrete, and composite soil are susceptible to aging and even damage due to rain and weathering. High post-maintenance costs

Method used

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  • Recompaction and plant covering combined protection method for loose unsaturated soil slope shallow layer
  • Recompaction and plant covering combined protection method for loose unsaturated soil slope shallow layer
  • Recompaction and plant covering combined protection method for loose unsaturated soil slope shallow layer

Examples

Experimental program
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Effect test

Embodiment 1

[0032] A residual soil high-fill embankment is located in the Nanping section of the Beijing-Fuzhou Expressway. The soil layers below the slope of the embankment are: 5 m thick loose loamy soil, 2.6 m thick gravel soil, 2.6 m thick sandy cohesive soil, 1.8 m thick fragmented strongly weathered fine sandstone and 1.8 m thick weakly weathered fine sandstone. The construction quality of the residual soil embankment is poor, the degree of compaction is low, and the shallow fill of the slope is in a loose state. The project is located in a humid climate zone, and the heavy rainfall in summer has caused the embankment slopes of some road sections to become unstable and slide, seriously affecting the safety of the embankment.

[0033] The control method of the present invention is used to control the side slope of the residual soil embankment. The 3m thick loose loamy soil below the slope surface shall be excavated from top to bottom along the slope surface, and the stones shall be ...

Embodiment 2

[0035]It is located in a granite residual soil road cutting in the Jiangxi Liren-Longnan section of the Daqing-Guangzhou Expressway. From top to bottom, the cutting slope soil layers are: 0.5m thick cultivated soil, 2m thick gravel-containing silty clay formed by weathering of granite, and thicker crushed fully weathered granite. The shallow cultivated soil and gravel-containing silty clay of the slope are loose and unsaturated soil with strong water permeability, and unstable landslides are prone to occur under heavy rainfall conditions.

[0036] The control method of the present invention is used to treat the residual soil cutting slope. The shallow 2.5m cultivated soil and gravel-containing silty clay are excavated from top to bottom along the slope, and the excavated cultivated soil is piled up separately for laying the nutrient soil layer. During the excavation process, the stones will be picked out and stacked separately for filling in the drainage blind ditch. Along t...

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Abstract

The invention discloses a recompaction and plant covering combined protection method for a loose unsaturated soil slope shallow layer. Loose residual soil or slope soil which is 2-3m thick under a slope is excavated, a plurality of water draining blind ditches in the slope direction are arranged at equal intervals from the slope foot to the 1 / 3-1 / 3 slope length position, the blind ditches are all communicated with water leakage holes formed in a slope foot retaining wall, the excavated loose residual soil or slope soil are layered and compacted until the compaction degree is more than 90%, namely a recompaction covering layer is formed, nutrient soil with the thickness as 0.15-0.3m is laid on the recompaction covering layer, and short and small plants are planted in the nutrient soil. The recompaction and plant covering combined protection method for the loose unsaturated soil slope shallow layer can effectively reduce rainfall infiltration, controls the height of a seepage line at the lower portion of a slope, keeps suction force of unsaturated soil, improves shearing resistance of a soil body and effectively prevents the loose unsaturated soil slope shallow layer from sliding. The slope protection method can use local materials, is easy to construct, low in construction cost and strong in practicability and has a good ecological restoration effect.

Description

technical field [0001] The invention relates to a slope surface protection method for soil slopes, in particular to a protection method for loose unsaturated soil slope shallow layer recompaction combined with vegetation coverage. Background technique [0002] The weathered residues of igneous rocks, strong earthquakes in Southwest China, dumping of tailings and excavation of engineering construction have formed a large number of loose unsaturated soil slopes, which are affected by the infiltration of heavy rainfall in summer, and landslides occur from time to time. This type of rainfall-induced landslide has a shallow layer Sliding, large quantity and wide range of features. The slope protection measures of the current national standards for soil slopes mainly include: masonry slope protection and face protection wall, sash, hammer face, etc. The main material of masonry slope protection and face protection wall is flake or block stone, which can be divided into two constr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/20A01G1/00
Inventor 詹良通刘小川陈云敏
Owner ZHEJIANG UNIV
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