Method of shallow reinforcement and surface reinforcement of loess slope

A technology for slopes and shallow layers, applied in soil protection, excavation, infrastructure engineering, etc., can solve problems such as weathering and peeling, rainfall erosion, long construction period, etc., achieve good elasticity, enhance stability, and solve the effects of weathering and peeling

Active Publication Date: 2013-02-13
江苏绿之源生态建设有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially for silty loess slopes, when the slope surface is first formed, the overall structure of the slope surface is basically stable, affected by the sun, weathering, rainfall, etc., there will be prominent slope instability and overall failure in a short period of time, such as weathering peeling, subsidence, etc. Due to the outstanding problems, the traditional slope protection measures of masonry and masonry not only have a long construction period and high cost, but also the masonry slope protection is easily affected by uneven deformation, low temperature freezing and thawing, and rainfall erosion, resulting in fracture and collapse.

Method used

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  • Method of shallow reinforcement and surface reinforcement of loess slope

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Example 1: Shallow layer reinforcement and surface layer consolidation of the loess slope in the open-air reservoir of Zhongwei City, Ningxia

[0028] Shallow anti-seepage reinforcement of the loess slope of the open-air reservoir in Zhongwei City, Ningxia Autonomous Region. The slope is 4m high and the slope ratio is 1:0.6. The slope is seriously weathered and peeled off. It belongs to the north temperate continental monsoon climate, with an annual average temperature of 8.4°C, a minimum temperature of -20°C, and a maximum temperature of 33°C. According to the soil conditions of the silty loess, the reinforcement steps are as follows:

[0029] 1. Slope cleaning. The weathered loose layer on the surface of the slope is cleaned by a combination of manual and mechanical methods.

[0030] 2. Excavate and cut drainage ditches. The intercepting ditch will be excavated at the outer edge of the slope. The cross section of the intercepting ditch is a natural curved side ditc...

Embodiment 2

[0036] Example 2: Shallow reinforcement and surface consolidation of loess slopes on highways in a city in Ningxia

[0037] The slope is a third-grade slope, and the weathering and spalling of the slope is serious. For the soil conditions of the silty loess, the reinforcement steps are as follows (see figure 1 and figure 2 ):

[0038] 1. Slope cleaning. The weathered loose layer on the surface of the slope 3 is cleaned by a combination of manual and mechanical methods.

[0039] 2. Excavate and cut drainage ditches. The intercepting ditch 1 is excavated at the outer edge of the slope. The section of the intercepting ditch 1 is a natural arc-shaped side ditch with a width W2 of 60 cm and a depth of 40 cm. Excavate the horizontal drainage ditch 6 of the platform on the inner side of the platform. The cross section of the horizontal drainage ditch is a natural arc side ditch with a width of 50cm and a depth of 30cm. Excavate the longitudinal drainage ditches 5 at intervals ...

Embodiment 3

[0045] Example 3: Reinforcement of Silty Loess Slope on a Highway in Gansu Province

[0046] The annual average temperature of the place is 11.5°C, and the annual minimum temperature is -20°C.

[0047] The slope is a secondary road slope, with a slope area of ​​7,580 square meters, a primary slope height of 8m, a secondary slope height of 6.5m, a slope ratio of 1:0.75, and a platform width of 2.5m.

[0048] The slope reinforcement steps include:

[0049] 1. Use a combination of manual and mechanical methods to clean the weathered loose layer on the surface of the slope to keep the slope smooth.

[0050]2. Excavate and cut drainage ditches. The intercepting ditch is excavated at the outer edge of the slope. The section of the intercepting ditch is a natural arc side ditch with a width of 80cm and a depth of 45cm. Excavate horizontal drainage ditches on the inner side of the platform. The section of the drainage ditch is a natural arc-shaped side ditch with a width of 50cm an...

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Abstract

The invention provides a method of shallow reinforcement and surface reinforcement of a loess slope. The method of shallow reinforcement and surface reinforcement of the loess slope comprises steps as below: excavation of intercepting drains, molding of intercepting drains, hole-drilling, grouting and preparation of a consolidation layer, wherein the molding of the intercepting drains means that waterborne polyurethane resin is sprayed on the surfaces of the intercepting drains. The hole-drilling means that holes are drilled perpendicularly to a slope surface. The grouting means that after drilling, the holes are grouted. The preparation of the consolidation layer means that the waterborne polyurethane is sprayed on the slope face with shallow drilling grouting reinforcement and a consolidation layer is formed on the slope surface. Due to the fact that shallow reinforcement and surface reinforcement of silty loess, the stability of the slope is effectively enhanced, shear strength of soil body of the reinforcement layer is improved almost three times than the shear strength of raw soils, and the consolidation layer with good elasticity, strength, cold resistance and anti-leakage functions is formed on the slope surface. The problems of efflorescing off of the surface and slope erosion are solved.

Description

technical field [0001] The invention belongs to the field of soil surface reinforcement, in particular to a reinforcement method for loess slopes. Background technique [0002] China is the country with the widest distribution and largest thickness of loess in the world. The loess landform is mainly distributed in a strip from west to east between 30° and 48° north latitude, covering an area of ​​about 640,000 square kilometers, including Shanxi, Shaanxi, Gansu, etc. The province is a typical loess distribution area, with a wide distribution area and a large thickness. This area not only has a large area of ​​loess, but also has a high salt content in the surface water, and the vegetation is not rich. [0003] Loess has visible large pores and well-developed vertical joints. Whenever the soil layer is soaked or under the influence of gravity, the loess layer itself loses its consolidation properties, often causing strong subsidence and deformation. During the construction ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/20E02D3/10
Inventor 祁有祥辜再元王京燕
Owner 江苏绿之源生态建设有限公司
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