Association between CBR and Soil Index Properties: Empirical Analysis from Chitwan and Makwanpur District Soil Samples

Authors

  • Dipak Koirala United Technical College, Bharatpur Chitwan, Nepal https://orcid.org/0009-0001-1387-0721
  • Keshab Datt Awasthi United Technical College, Bharatpur Chitwan, Nepal
  • Niraj Bohara United Technical College, Bharatpur Chitwan, Nepal

Keywords:

California Bearing Ratio, LL, PL, PI, Soil Strength Parameters, Regression Analysis

Abstract

The California Bearing Ratio (CBR) value is a crucial soil parameter in road construction and design. Obtaining representative CBR values is challenging, requiring time-consuming and expensive testing procedures. To address this issue, regression equations were developed to establish correlations between CBR and soil index properties. Laboratory tests were conducted to determine the soaked CBR, Liquid Limit (LL), Plastic Limit (PL), Plasticity Index (PI), Maximum Dry Density (MDD), and Optimum Moisture Content (OMC) of soil samples. Regression models were then created between CBR and different sets of soil index properties using Microsoft Excel 2007. Strong correlations were observed between soaked CBR, PL, PI, OMC, and MDD (R2 = 0.744); CBR, LL, PL, OMC, and MDD (R2 = 0.702); CBR, PI, OMC, and MDD (R2 = 0.643); CBR, LL, OMC, and MDD (R2 = 0.621); and CBR, OMC, and MDD (R2 = 0.602). Among all equations, the relation CBR = 0.72 PL – 1.22 PI + 2.34 OMC + 106.97 MDD – 222.46 exhibited the strongest correlation with a P-value of 0.005 and R2 of 0.744.

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Author Biographies

Dipak Koirala, United Technical College, Bharatpur Chitwan, Nepal

Lecturer, Department of Civil Engineering

Keshab Datt Awasthi, United Technical College, Bharatpur Chitwan, Nepal

Professor & Principal

Niraj Bohara, United Technical College, Bharatpur Chitwan, Nepal

Assistant Professor and HoD, Department of Civil Engineering

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Published

2023-07-14

How to Cite

Koirala, D., Awasthi, K. D., & Bohara, N. (2023). Association between CBR and Soil Index Properties: Empirical Analysis from Chitwan and Makwanpur District Soil Samples. Journal of UTEC Engineering Management, 1(1), 7–15. Retrieved from https://nepjol.info/index.php/juem/article/view/56642

Issue

Section

Research Articles