Design charts for black cotton subgrade soil in Karad Taluka: a case study
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TECHNICAL PAPER
Design charts for black cotton subgrade soil in Karad Taluka: a case study Piyush G. Chandak1,2 · Anand B. Tapase3 · Ravindra P. Patil4 · Sabir S. Sayyed1 Received: 28 April 2020 / Accepted: 15 September 2020 © Springer Nature Switzerland AG 2020
Abstract The primary objective of this research is to create a detailed and useful data for the design of rural roads in Karad Taluka since the use of semi-mechanistic–empirical design charts fails early of its design life. Finite element method has been adopted for this purpose using a program coded in FORTRAN wherein the analysis is based on realistic constraints associated with the in situ conditions having black cotton soil as subgrade material. The critical factors such as rutting and fatigue are analyzed using two-dimensional axisymmetric analyses by various trials and combinations of material properties and depths of component layers. The tensile strain acting horizontally below the bituminous layer and compressive strain acting above the top of subgrade showed a decreasing trend with the increments in the depths of bituminous layer and improvement in strength of subgrade. The base layer material of 100 MPa is deemed to be unsuitable for all trial depths and combinations. The base layer material of higher quality such as 300 MPa and 450 MPa proves to be more suitable for design purpose, and for these materials with every increment of 15 MPa in subgrade, the safer values of both the strains improved by 4%. Design charts are also created for using construction and demolition waste as base layer with material property of 200 MPa. Such type of research for a particular case study area will produce long-lasting, durable pavement design and also focus on using different types of materials in base layer. Keywords Parametric study · Rural roads · Finite element method · Fatigue · Rutting
Introduction Engineers and scientists alike, all over the globe, have been working to design long-lasting, durable roads and avoid the premature failures of rural roads. Economic growth of a * Anand B. Tapase [email protected]
Piyush G. Chandak [email protected]; [email protected]
Ravindra P. Patil [email protected] Sabir S. Sayyed [email protected] 1
Visvesvaraya Technological University, Belagavi, India
2
Department of Civil Engineering, Annasaheb Dange College of Engineering and Technology, Ashta, India
3
Karmaveer Bhaurao Patil College of Engineering, Satara, India
4
Jain AGMIT, Jamkhandi, India
nation mostly relies on a good transportation system. In a country such as India, rural roads (RRs) cover about 80% of the overall transportation network [1]. A strong network of infrastructure helps boost the development of any nation. For a developing country such as India, it is necessary that the rural section of the country keeps on growing. As such, it is imperative that the rural areas have proper access and a good connectivity with the urban and nearby developed areas. Hence, rural roads play an important role in the eco
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