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原文传递 EVALUATION OF ALLUVIAL SOIL SUBGRADE FOR FORENSIC PURPOSES USING IN-SITU TESTING TECHNIQUES

题名：	EVALUATION OF ALLUVIAL SOIL SUBGRADE FOR FORENSIC PURPOSES USING IN-SITU TESTING TECHNIQUES
正文语种：	英文
作者：	SIDHU DALJEET SINGH; JHA JAGADANAND; GILL K.S.
作者单位：	Sub Divisional Engineer, PWD B&R, Punjab; Principal, Muzaffarpur Institute of Technology, Muzaffarpur, Bihar; Professor and Head, Department of Civil Engineering Guru Nanak Dev Engineering College Ludhiana, Punjab
关键词：	prediction；density；in-situ；saturation；soil；content；variation；suppose；natural；different
摘要：	The problem of the premature failure of roads constructed on alluvial soil subgrade is very common. Despite proper design and mechanised construction, some stretches of roads continue to show the signs of subsidence, rutting and cracking within a short period of operation. The problem is more prominent for pavements having the subgrade layer made-up of natural soil. Alluvial soils if not compacted to the required density become sensitive to moisture variation with time. The thickness of pavement layers is designed based upon the laboratory-soaked California Bearing ratio (CBRs) value of the natural soil, but to check the CBRs value at the site is cumbersome process, hence many researchers have suggested indirect methods to measure the CBR value. Index properties of soil-based prediction models are developed for soaked CBR at 97% of maximum Modified Dry Density (MDD.) of soil and DCP test-based prediction models on field moisture content (MCField), that is below the Optimum Moisture Content (OMC) at which the layer is supposed to be laid. Thus, the CBR values given by such equations leads to over estimation of in-situ CBRs particularly in case of plastic soils. In the present study, efforts have been made to suggest some correction factors when the field-density and field-moisture are different from the stipulated density, i.e. 97% MDD and moisture content near to saturation.
出版年：	2019
期刊名称：	Indian Highways
卷：	47
期：	7
页码：	18-23