Investigation of the sufficiency of CBR method sections used in the design of mine haul roads with the mechanistic method

Serdar Ercins; Murat Bostancıoğlu

doi:10.7764/RDLC.24.1.75

Authors

Serdar Ercins Department of Mining and Mineral Extraction, Sivas Cumhuriyet University, Sivas (Turkey)
Murat Bostancıoğlu Department of Civil Engineering, Sivas Cumhuriyet University, Sivas (Turkey)

DOI:

https://doi.org/10.7764/RDLC.24.1.75

Keywords:

Mine haul roads, structural design, CBR cover curve method, mechanistic method, limit strain.

Abstract

Mine haul roads are one of the most critical components of mining operation sites, both in terms of vehicle operating conditions and costs and in terms of providing the stable rolling surface required for sustainable haulage. There are many methods to determine layer materials and thicknesses in a traditional mine haul road section consisting of sub-base, base, and surface layers. The "California Bearing Ratio (CBR) Cover Curve" method, which is simple and practical to apply, is a common method frequently preferred in the design of mine haulage roads. However, the CBR method has disadvantages, such as being empirical and ignoring the surface layer stiffness in the design. In this study, vertical strain values on the subgrade were obtained by mechanical analysis of the pavement sections recommended by the CBR method and having different subgrade CBR values, loading conditions, and surface layer stiffnesses. The obtained strain values were compared with the limit strain values given in the literature, and the sufficiency of the CBR method was analyzed based on different design parameters. The results obtained from the study show that the limit strain values exceeded in the sections recommended by the CBR method, depending on the increase in the subgrade CBR value and the wheel load values on the section. One of the most notable results of the current study is that the stiffness of the surface layer in direct contact with vehicle wheels is one of the most essential parameters in the design of mine haul roads. In mine haul roads where the surface layer rigidity is low or there is no surface layer, the sections recommended by the CBR method are insufficient, and it has been revealed that a high-rigidity unbound layer, bituminous surface layer, or rigid pavement should be used as the surface layer.

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