Abstract
This paper presents the procedure of evaluation of the modulus of elasticity (E) and the modulus of subgrade reaction (ks) value based on the California Bearing Ratio (CBR) tests and FEM analysis. The pressure-displacement response of the soil in the CBR mould is simulated using Cosmosworks FEM model where the soil, the load plunger, and the steel mould of CBR are represented. The correlation of Modulus of Elasticity (E) with California Bearing Ratio (CBR) is developed based on the elastic properties of the soil sample. Furthermore, the correlation between E and CBR is proposed. Using the E values, modulus of subgrade reaction can be calculated and vice versa as well. Thus CBR test is expected to simplify the effort in determination of the modulus of subgrade reaction which is used in Foundation design, soil structure interaction, design of highway formations etc.
Highlights
In highway formations the subgrade layer, where acts as a pavement foundation should be well designed
The California Bearing Ratio (CBR) test is commonly used to determine the suitability of a soil as a subgrade or subbase for highway and runway design and construction
One of the parameters obtained from the field plate load test is the spring constant/ modulus of subgrade reaction, ks-value
Summary
In highway formations the subgrade layer, where acts as a pavement foundation should be well designed. The ks-value is used as a primary input in pavement design models, and is based on Minnesota Department of Transport (MnDot) pavement design It can be measured using a field plate load test conducted on top of the subgrade (Kameswara Rao, 2000; MnDoT, 2007). The value of ks can be obtained from the CBR test as described below In this investigation, the correlation of CBR versus E CBR versus ks are developed to bridge the gap which is much needed to integrate the engineering behaviour of these two hitherto uncorrelated tests, though concerned with the same subgrade properties needed for engineering design of foundations and pavements. Journal of Civil Engineering Research. 2012; 2(1): 34-40 sign procedures based on CBR value and ks used in highway engineering as well as foundation engineering
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