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Bituminous pavement structure based on traffic condition of soft foundation and heavy load and subgrade processing method

A technology for asphalt pavement and transportation, which is applied to the coagulation pavement, roads, roads and other directions paved on site to achieve the effect of comprehensive cost saving, promotion of progress, and improvement of rebound and deflection.

Active Publication Date: 2010-02-03
TIANJIN MUNICIPAL ENG DESIGN & RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to overcome the existing asphalt pavement structure only for the load standard of uniaxial axle load less than 130KN and double axle load of 240KN, and without fully considering the requirements of soft foundation heavy load on the strength and depth of the roadbed, to provide a roadbed in soft soil The asphalt pavement structure and subgrade treatment method based on the soft foundation and heavy-load traffic conditions can ensure that the asphalt pavement structure is suitable for the influence of heavy-load traffic during the service period of 15 to 20 years under the traffic condition of the foundation uniaxial greater than 130KN, and maintains the structure intact

Method used

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  • Bituminous pavement structure based on traffic condition of soft foundation and heavy load and subgrade processing method
  • Bituminous pavement structure based on traffic condition of soft foundation and heavy load and subgrade processing method
  • Bituminous pavement structure based on traffic condition of soft foundation and heavy load and subgrade processing method

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Effect test

Embodiment 1

[0044] For a heavy-duty urban expressway on a soft soil foundation, trucks with more than four axles account for 44%, and the cumulative equivalent axle times Ne on a lane within the design period is 67×107 , the road surface elevation is limited by the surrounding elevation and needs to be excavated.

[0045] According to the cumulative number of equivalent axles and the proportion of trucks with more than four axles, the traffic level of the road is determined as special T 2 According to the surrounding elevation, the foundation needs to be excavated. The depth of the subgrade work area is 2.0 meters, and the treatment thickness is also 2.0 meters. The treatment measures are: after dredging and drying, the bottom layer is treated with mixed slag + geogrid + gravel, The thickness of the mixed slag is 70cm, and the thickness of the crushed stone is 50cm. A four-step treatment layer is applied on it. From bottom to top, it is 20cm lime soil (lime 10%)+20cm lime soil (lime 10%)+2...

Embodiment 2

[0051] In a heavy-duty expressway with soft soil foundation, trucks with more than four axles account for 38%, and the cumulative equivalent axle times Ne on a lane within the design period is 35×10 7 , the elevation of the road surface is limited by the crossing passage and bridge structures, and the filling height is between 3.2 and 3.6 meters.

[0052] According to the cumulative number of equivalent axles and the proportion of trucks with more than four axles, the traffic level of the road is determined as special T 1 According to the filling height of the subgrade, it is determined that the subgrade does not need to be excavated. The depth of the subgrade work area is 1.8 meters. The treatment measures are: after the subgrade surface is cleared, fill with 6% lime soil to 80cm below the top of the roadbed, and then fill from bottom to top 40cm lime soil (lime 8%) + 20cm cement lime soil (2% cement + 5% lime) + 20cm cement lime soil (3% cement + 6% lime) for treatment, 20cm...

Embodiment 3

[0059] In a heavy-duty expressway with soft soil foundation, trucks with more than four axles account for 58%, and the cumulative equivalent axle times Ne on a lane within the design period is 3.4×10 9 , the elevation of the road surface is limited by the crossing passage and bridge structures, and the filling height is between 2.5 and 2.8 meters.

[0060] According to the cumulative number of equivalent axles and the proportion of trucks with more than four axles, the traffic level of the road is determined as special T 3 According to the filling height of the subgrade, it is determined that the subgrade does not need to be excavated. The depth of the subgrade work area is 2.3 meters. The treatment measures are: after the subgrade surface is cleared, fill with 6% lime soil to 100cm below the top of the roadbed, and then fill from bottom to top 60cm lime soil (lime 8%) + 20cm cement lime soil (2% cement + 6% lime) + 20cm cement lime soil (4% cement + 6% lime) for treatment, 20...

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Abstract

The invention discloses a bituminous pavement structure based on traffic condition of soft foundation and heavy load and a subgrade processing method. The bituminous pavement subgrade processing method based on traffic condition of soft soil foundation and heavy haul comprises the following steps: (1) determining the traffic level of road surface structure to be Special Level 1, Special Level 2 orSpecial Level 3 according to the standards of accumulative equivalent axles and the ratio of trucks with more than four axles on one lane; (2) determining the subgrade work zone depth of the SpecialLevel 1 and Special Level 2 to be 180-200cm and the work zone depth of the Special Level 3 to be 200-250cm; (3) determining earth pad strength level of the Special Level 1 is S4, S5 and S6; (4) processing the subgrage in the work zone depth with the method of laying mixed dregs, geogrid and detritus from bottom to top; (5) laying road surface. The method of the invention can improve the modulus ofresilience of the road surface structure by 100-200%, lower deflection by 50-80% and save comprehensive cost of construction by 12-27.8%.

Description

technical field [0001] The invention relates to a typical structure of an asphalt pavement, in particular to an asphalt pavement structure and a roadbed treatment method based on soft foundation and heavy-load traffic conditions. Background technique [0002] In recent years, heavy loads and overloads have caused huge damage to road bridges, and the international road community has also begun to pay attention to the heavy duty (Heavy Duty) traffic road pavement structure (meaning that the accumulated equivalent standard axle times after the road is opened to traffic greatly exceeds the general level, and the pavement performance is attenuated. The phenomenon of unconventional development, known as heavy traffic) has been extensively studied. At the same time, countries around the world have also increased the axle load mass limit and the total mass limit of the vehicle accordingly. The load limit is increased to 21t; the total train quality is increased to 45t. The "Regula...

Claims

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Application Information

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IPC IPC(8): E01C7/00E01C7/32E01C3/00
Inventor 王新岐王晓华刘润有苑红凯冯炜龚风刚赵建伟曾伟付晓敦狄升贵练象平邱志明曹立松于立军任金霞
Owner TIANJIN MUNICIPAL ENG DESIGN & RES INST
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