Expansive soil texture improved roadbed structure in seasonally frozen soil area

A soil improvement and expansive soil technology, applied in the direction of roads, roads, climate sustainability, etc., can solve the problems that threaten the quality and safety of the project, the soil moisture is difficult to discharge, and the strength is reduced, so as to improve the strength and freeze-thaw resistance, The effect of reducing land occupation and environmental pollution, high hardness and durability

Pending Publication Date: 2020-11-13
HENAN UNIV OF URBAN CONSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Affected by the temperature, the soil layer is affected by the freeze-thaw deformation in the early stage, which makes the soil looser. After the freeze-thaw, the expansive soil subgrade is damaged after being eroded by rainfall. Landslides and erosion occurred in loose soil channels under the action of rainfall and water immersion, which seriously threatened the quality and safety of the project
The subgrade often suffers from frost heaving, thawing, and strength reduction. The structural damage and evolution of the subgrade filler is the root cause, causing serious economic losses to the infrastructure.
[0003] Due to the relatively large amount of montmorillonite and illite contained in the expansive soil, it is difficult to discharge the water inside the soil during the construction process. After the completion of the project, after repeated freeze-thaw periods, large frost heaving deformation occurred, which seriously threatened the project. quality and safety of

Method used

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  • Expansive soil texture improved roadbed structure in seasonally frozen soil area
  • Expansive soil texture improved roadbed structure in seasonally frozen soil area

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] like figure 1 As shown, a subgrade structure of expansive soil improvement in seasonal frozen soil areas, the improved subgrade structure is a multi-layer composite structure, and the outside of the multi-layer composite structure is covered with a subgrade wrapping soil layer 6, and the multi-layer composite structure The structure from top to bottom is the first improved reinforcement layer 1, the construction waste filling layer 2, the second improvement reinforcement layer 3 and the construction waste filter layer 4, the first improvement reinforcement layer 1 and the second improvement reinforcement layer 3 The ingredients are the same, and the preparation method is: first mix the steel slag powder and expansive soil with a mass ratio of 1:4 to form a preliminary improved expansive soil mixture, then crush the construction waste to a particle size of no more than 10mm, and then mix it with the preliminary improved expansive soil The soil mixture is mixed at a mass ...

Embodiment 2

[0038] This embodiment is an improvement made on the basis of embodiment 1, its main structure is the same as that of embodiment 1, and the improvements are as follows: figure 1 As shown, the cross-section of the improved roadbed structure is an isosceles trapezoid with a narrow top and a wide bottom, and L-shaped card platforms 7 extending along the roadbed are arranged on both sides of the construction waste filter layer 4 and the second improved reinforcement layer 3 , and these L-shaped card platforms 7 cooperate with the roadbed edge-wrapping soil layer 6 on the side to form a cavity with a right-angled triangle section, and fill the cavity with collapsible loess;

[0039] On the bottom wall of each cavity, several deep holes are drilled vertically downwards along the extension direction of the subgrade, until they penetrate 0.8-1.5m into the expansive soil surface below the construction waste filter layer 4, and then drill into each deep hole. Inject cement mortar, and f...

Embodiment 3

[0041] This embodiment is an improvement made on the basis of embodiment 2, its main structure is the same as that of embodiment 2, and the improvements are as follows: figure 1 and 2 As shown, there are several ventilation and drainage mechanisms 9 distributed in the construction waste filling layer 2 along the extension direction of the roadbed, and each group of ventilation and drainage mechanisms 9 includes several groups of ventilation and drainage mechanisms buried in the construction waste filling layer 2 along the extension direction of the roadbed. Pipe assembly, each group of ventilation pipe assembly includes two inclined pipes 901 and a ventilation main pipe 903 located outside the improved roadbed structure and in the same direction as the roadbed extension, the two inclined pipes 901 are distributed on both sides of the construction waste filling layer 2 , and the adjacent one end is connected as a whole through the pipe joint 902, and the free ends of the two in...

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Abstract

The invention discloses an expansive soil texture improved roadbed structure in a seasonally frozen soil area. A first improved reinforcing layer, a construction waste filling layer, a second improvedreinforcing layer and a construction waste filtering layer are sequentially arranged from top to bottom. The first improved reinforcing layer and the second improved reinforcing layer have the same components; the preparation method comprises the steps of uniformly mixing steel slag powder and expansive soil according to a mass ratio of 1: 4 to form a preliminary improved expansive soil mixture,crushing the construction waste until the particle size does not exceed 10mm, and mixing the crushed construction waste with the preliminary improved expansive soil mixture according to a mass ratio of (2 to 3): (1 to 2) to form an improved expansive soil filling material; the construction waste filter layer and the construction waste filling layer being both composed of construction waste with different particle size gradations. The expansive soil is improved by utilizing the construction waste and the steel slag powder, so that the water sensitivity of the expansive soil is effectively reduced, the strength and freeze-thaw resistance of the roadbed are effectively improved, and meanwhile, the construction waste, the steel slag and other wastes are effectively utilized.

Description

technical field [0001] The invention relates to a roadbed structure in the field of road construction, in particular to a roadbed structure for improving expansive soil quality in seasonally frozen soil areas. Background technique [0002] Seasonally frozen soil refers to the soil layer that freezes in winter and thaws in spring. my country's seasonal frozen soil is widely distributed, accounting for about 53.5% of the country's land area, and most of them belong to arid and semi-arid areas with water shortages. Affected by the temperature, the soil layer is affected by the freeze-thaw deformation in the early stage, which makes the soil looser. After the freeze-thaw, the expansive soil subgrade is damaged after being eroded by rainfall. Landslides and erosion occurred in loose soil channels under the action of rainfall and water immersion, which seriously threatened the quality and safety of the project. Frost heaving, thawing, and strength reduction often occur in subgra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01C3/00C04B28/08C04B28/00C04B18/16C04B14/36
CPCC04B14/361C04B18/16C04B28/00C04B28/082E01C3/00C04B14/06C04B22/002C04B7/00Y02W30/91
Inventor 翟聚云朱晗宇袁延召杨铭斐李雨薇郁博文刘帅言志信黄伟倪红梅
Owner HENAN UNIV OF URBAN CONSTR
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