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A rapid construction method of over-wet soil subgrade

A construction method and technology of over-wet soil, which is applied in the direction of infrastructure engineering, roads, roads, etc., can solve the problems of overturning performance without special soil fillers, so as to ensure the progress of the project and the quality of the roadbed, improve the compaction speed and efficiency, and improve The effect of construction efficiency

Active Publication Date: 2018-05-01
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] At present, there is no special research on the tumbling performance of special soil fillers at home and abroad.

Method used

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  • A rapid construction method of over-wet soil subgrade
  • A rapid construction method of over-wet soil subgrade
  • A rapid construction method of over-wet soil subgrade

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] High Liquid Limit Red Clay of Hainan Haitun Expressway

[0058] The subgrade construction test of the new method was carried out in the K6+220~K6+420 section of the Haikou-Tunchang Expressway in Hainan. The disturbed soil samples of high liquid limit red clay were collected on site, and the basic physical property indexes and engineering property tests were carried out. The indoor test results show that: the natural moisture content of the high liquid limit red clay of Haitun Expressway is 31.8%, which is greater than its plastic limit of 30%, and its liquid limit is 34%, so it is judged that the soil is an over-humid high liquid limit soil; the natural dry density is 1.46g / cm 3 . The compaction controlled moisture content obtained by the compaction control method aiming at the maximum bearing capacity is 22.5%, and the dry density corresponding to the compaction curve is 1.74g / cm 3 .

[0059] The average annual temperature in Hainan is high, the temperature differe...

Embodiment 2

[0075] Guangdong Granite Residual Soil Example

[0076] The subgrade construction test of the new method was carried out in the K110+000~K110+200 section of Guangdong Guangfo-Zhaozhou Expressway. Disturbed soil samples of granite residual soil were collected on site, and basic physical property indexes and engineering property tests were carried out. The indoor test results show that the natural moisture content of the granite residual soil on the Guangzhou-Foshan-Zhaozhou Expressway is 26%, which is greater than its plastic limit of 25%, and its liquid limit is 32%. 1.44g / cm 3 . The compaction controlled moisture content obtained by the compaction control method aiming at the maximum bearing capacity is 18.3%, and the dry density corresponding to the compaction curve is 1.65g / cm 3 .

[0077] Guangdong has abundant precipitation, with an average annual precipitation of 1,300 to 2,500 millimeters, and an average of 1,777 millimeters in the whole province. The annual distri...

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Abstract

The invention provides a rapid construction method for an over-wet soil roadbed. According to the natural water content, the compaction control water content, the seepage coefficient and the air inflow value of over-wet soil filling, the wind speed and the wind temperature are determined. Through rapid dehumidification equipment, the local environment of over-wet soil of a loose laid layer is effectively improved, the air temperature and the relative humidity of the local environment exceed the air inflow value of roadbed filling, meanwhile, the forward and reverse rotation stirring effect of an overturning and stirring wheel is adopted for assistance, and therefore the water content of the over-wet soil filling is rapidly reduced to the compaction control water content of over-wet soil. By the adoption of the method, the roadbed compaction quality is stable and reliable, the roadbed disease happening time is greatly delayed, and the use efficiency of a road surface is effectively improved; the technical problem that it is difficult to ted the over-wet soil within the set time to reach the compaction control water content under the rainy climate condition in South China due to the fact that the over-wet soil is high in water content is solved, the use rate of the over-wet soil is greatly increased, the construction efficiency of the over-wet soil is greatly improved, a construction period is shortened, and the manufacturing cost is saved; and the technological cost is low, the roadbed quality is good, and economic benefits are remarkable.

Description

technical field [0001] The invention discloses a rapid construction method of over-humid soil roadbed; especially for the filling of over-wet soil roadbed in high-temperature and rainy areas in the south, rapid dehumidification equipment is used to quickly achieve compaction and control the moisture content in a short time, and realize Rapid construction in rainy season. It belongs to the technical field of subgrade engineering. Background technique [0002] Over-wet soil refers to the fine-grained soil whose moisture content is greater than the plastic limit moisture content, and which must be processed by corresponding technical measures before being compacted to the specified compaction degree (the mass of particles with a particle size of 0.075 mm or less is greater than or equal to 50% of the total mass) soil), most of which belong to high liquid limit soil, such as high liquid limit red clay, granite residual soil, expansive soil, etc. Over-humid soils are widely dis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01C3/06E01C21/00E02D3/11
CPCE01C3/06E01C21/00E02D3/11
Inventor 张锐郑健龙
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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