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Method for determining resilience modulus parameter of soil foundation of road

A technology for determining the modulus of resilience and parameters, which is applied in the field of materials, can solve problems such as poor operation, poor applicability, and inability to accurately estimate the modulus of resilience, so as to save design costs, reduce the difficulty of obtaining values, and improve The effect of design speed

Inactive Publication Date: 2013-01-16
SHANXI PROVINCIAL RES INST OF COMM +1
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Problems solved by technology

[0005] Comprehensive analysis shows that although some achievements and a lot of useful experience have been obtained in the estimation of the rebound modulus parameters of subgrade soil at home and abroad, the use of these empirical relational expressions has its limitations, and the conditions of use and formula establishment conditions need to be examined The similarity, difficult operation, poor applicability, can not accurately predict the value of the elastic modulus

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  • Method for determining resilience modulus parameter of soil foundation of road
  • Method for determining resilience modulus parameter of soil foundation of road

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Embodiment Construction

[0019] A method for determining the modulus of resilience parameter of highway soil foundation, it comprises the following steps:

[0020] (1) Determine the subgrade stress level according to the road grade and typical pavement structure[ θ , τ oct ], and the subgrade compaction range CD;

[0021] For example, ×× Expressway, combined with the typical pavement structure of the expressway, the stress level of the subgrade calculated by BISAR calculation software is [55,4.714], and the degree of compaction CD is determined according to the depth of the subgrade;

[0022] (2) In the highway passing area, select typical subgrade soil samples, and test the physical properties of typical soil samples, including liquid limit and water content;

[0023] The ×× Expressway is located in the northern part of the Loess Plateau, and the soil types along the route are mostly silty clay or silt with low liquid limit. Select typical subgrade soil samples with low liquid limit silty clay a...

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Abstract

The invention relates to a method for determining the resilience modulus parameter of the soil foundation of a road, comprising the following steps: (1) determining the stress level [theta, tauoct] and the compaction degree range CD of the soil foundation of the road according to the road grade and the typical road surface structure; (2) in the passing area of the road, selecting the typical soil sample of the soil foundation of the road, and detecting the physical indexes including the liquid limit and the water content of the typical soil sample; (3) calculating the range [ki1 ki2] (i=1, 2 and 3) of a model parameter ki according to the step (2) throughthe estimation formula of the model parameter ki; and (4) calculating two resilience moduli of the soil foundation of the road according to the step (2) and the step (3) through the estimation formula of the resilience modulus of the soil foundation of the road. Due to the adoption of the technology, the resilience modulus of the soil foundation of the road can be obtained quickly, the cost and time spent doing dynamic triaxial test are saved, the test doing complexity, the difficulty of obtaining the resilience modulus parameter value and the test engineering amount are reduced, the design speed is increased, and the design cost is saved.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a method for determining parameters of elastic modulus of road soil foundation. Background technique [0002] Combined with the requirements of the new round of highway asphalt pavement design specifications, the material parameters of each layer of the pavement are taken as dynamic parameters during highway design, that is, when the pavement structure is designed, the value of the rebound modulus of each layer of the pavement is changed from the original static rebound modulus to Dynamic modulus of resilience. For the subgrade, in order to obtain the dynamic modulus of resilience of the subgrade soil, a dynamic triaxial test is required. Currently, the instruments that can perform dynamic triaxial tests include dynamic triaxial instruments and large material testing machines (MTS, UTM). The common points of all kinds of test instruments are expensive equipment, co...

Claims

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Application Information

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IPC IPC(8): G01N3/40
Inventor 韩萍张晓燕段丹军黄琴龙徐晓波
Owner SHANXI PROVINCIAL RES INST OF COMM
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