Soft soil foundation heavy traffic road subgrade

A technology for soft soil foundation and roadbed, applied in the direction of roads, roads, buildings, etc., can solve the problems of road surface diseases and insufficient bearing capacity of the roadbed, and achieve the effects of dispersing the stress of the roadbed, improving performance and high strength

Inactive Publication Date: 2014-03-26
SHANGHAI MUNICIPAL ENG DESIGN INST GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a heavy-duty traffic road subgrade on soft soil foundation, which overcomes the defects in the existing design and solves the road surface disease caused by the insufficient bearing capacity of the subgrade

Method used

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  • Soft soil foundation heavy traffic road subgrade

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A heavy-duty urban arterial road on a soft soil foundation has a daily traffic volume of 9,000 medium-sized trucks and large buses per d lane, and the cumulative number of standard axle loads on a lane within the design period is 74 million times. The road surface elevation is affected by crossing passages and bridges. Restricted by structures, the filling height is between 1.5-1.8m, and the optimal moisture content of the soil used for lime soil, cement lime soil and cement soil is 15%.

[0029] According to the daily traffic volume of medium-sized or larger trucks and large passenger cars and the accumulated times of standard axle loads, the traffic level of this road is determined to be heavy traffic. According to the height of the filling soil of the roadbed, it is determined that the roadbed needs to be excavated 0.2-0.5m, and the depth of the roadbed work area is 2.0 meters. The treatment measures are: after the subgrade is cleared and excavated, the bottom layer a...

Embodiment 2

[0032] For a heavy-duty urban expressway on a soft soil foundation, the daily traffic volume of medium-sized trucks and large buses is 4,000 vehicles / d lane, and the cumulative number of standard axle loads on a lane within the design period is 24 million times. The road surface elevation is limited by the surrounding elevation. Under excavation, the optimal water content of the soil used for lime soil, cement lime soil and cement soil is 16%.

[0033] According to the daily traffic volume of medium-sized or larger trucks and large passenger cars and the cumulative times of standard axle loads, the traffic level of this road is determined as heavy traffic. According to the surrounding elevation, the roadbed needs to be excavated. The depth of the roadbed work area is 1.8m, and the treatment thickness is also 1.8m. The treatment measures are: after dredging and drying, the bottom layer adopts the treatment method of 50cm slag + steel-plastic grid 1cm + 30cm gravel, and then from...

Embodiment 3

[0036] In a heavy-duty expressway with soft soil foundation, the daily traffic volume of medium-sized trucks and large passenger cars is 3,000 vehicles / d lane, and the cumulative number of standard axle loads on a lane within the design period is 15 million times. The road surface elevation is affected by the crossing passage and bridge structure. Due to material restrictions, the filling height is between 2.3-3.0m, and the optimal water content of the soil used for lime soil, cement lime soil and cement soil is 11%.

[0037] According to the daily traffic volume of medium-sized trucks and large passenger cars and the cumulative times of standard axle loads, the traffic level of the road is determined as heavy traffic. According to the filling height of the roadbed, it is determined that the roadbed does not need to be excavated. The depth of the roadbed work area is 1.5m. The treatment measures are: After clearing the surface of the roadbed, fill it to 150cm below the top of t...

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Abstract

The invention relates to a soft soil foundation heavy traffic road subgrade, which is characterized in that the overall thickness of a subgrade working area is 150cm to 200cm, and is sequentially provided with slag, steel-plastic grids, broken stone, lime soil, cement lime soil and cemented soil. A subgrade processing method under a soft foundation heavy traffic condition is determined according to the depth of the working area, the subgrade within the depth of the working area is processed by sequentially paving the slag, the steel-plastic grids and the broken stone from bottom to top (the thickness of the slag is 40cm to 60cm, the thickness of the steel-plastic grid is 1cm to 3cm, and the thickness of the broken stone is 20cm to 40cm), and then the lime soil which is 20cm to 60cm thick, the cement lime soil which is 20cm to 60cm thick and the cemented oil which is 20cm to 40cm thick are paved. The subgrade has the advantages of high strength, good stability, good duration and the like, and the expense of the road in the full-service-life period can be remarkably reduced. The invention relates to an environment-friendly road design method.

Description

technical field [0001] The invention belongs to the technical field of subgrades in road engineering, and in particular relates to a heavy-duty traffic road subgrade and a construction method thereof. Background technique [0002] As a national shipping center and financial center under construction, the Shanghai area is playing an increasingly important role in transportation and logistics. With the continuous improvement of the economic level and the rapid development of road transportation, the vehicles in transportation are developing towards large and heavy-duty vehicles, especially in the main roads, ports and other heavy-duty transportation. In fact, in other provinces of the country, the phenomenon of overloading is also common, and the Shanghai area is a soft soil foundation, and the damage of overloading is even greater. [0003] In recent years, there has been a term that has attracted much attention in the international road community-heavy traffic. It refers to...

Claims

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Application Information

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IPC IPC(8): E01C3/04
Inventor 白彦峰温学钧徐健郑晓光乔英娟
Owner SHANGHAI MUNICIPAL ENG DESIGN INST GRP
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