Volume 7 Issue 1 December - February 2017
Research Paper
Prediction of Soaked CBR Value With Index Properties of Black Cotton Soils of Sangareddy Region
Prashanth Miryala*, B.N.M. Rao**, Kommu Suresh***
* Postgraduate student, Department of Civil Engineering, VNR Vignana Jyothi Institute of Engineering and Technology, Hyderabad, India.
** Professor, Department of Civil Engineering, VNR Vignana Jyothi Institute of Engineering and Technology, Hyderabad, India.
*** Assistant Professor, Department of Civil Engineering, VNR Vignana Jyothi Institute of Engineering and Technology, Hyderabad, India.
Miryala, P. , Rao, N.B. and Kommu, S. (2017). Prediction of Soaked CBR Value With Index Properties of Black Cotton Soils of Sangareddy Region. i-manager’s Journal on Civil Engineering, 7(1), 8-16. https://doi.org/10.26634/jce.7.1.10365
Abstract
Thickness of the pavement affects the subgrade strength in the design of flexible pavements. California Bearing Ratio (CBR) is one of the methods to determine the subgrade strength. The conventional soaked CBR testing method is expensive, laborious, and time consuming, so, here an attempt was made for correlating CBR values with the index properties of soils like LL, PL, PI, OMC, and MDD. Correlation co-efficient (R2 ) value of index properties with soaked CBR is determined. In this study, thirty (30) number of soil samples (having 44 < LL < 84) were collected from different parts of Sangareddy District (Telangana). Different laboratory tests, including Atterberg limits, Specific Gravity, Gradation Analysis, soaked CBR and compaction were performed on these samples and various linear relationships were established between index properties and soaked CBR of the samples using a statistical software (SPSS). Simple and multiple linear regression analysis was performed and eight (8) predictive equations were developed for estimating the soaked CBR value from the index properties of soil with a maximum R2 value of 0.947.
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