International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395 -0056 Volume: 03 Issue: 11 | Nov -2016 www.irjet.net p-ISSN: 2395-0072 © 2016, IRJET | Impact Factor value: 4.45 | ISO 9001:2008 Certified Journal | Page 1036 EXPERIMENTAL STUDY ON DEVELOPMENT OF CORRELATION BETWEEN CBR AND DYNAMIC CONE PENETROMETER TEST Er. Sobiya Sidiq 1 , Dr. Rajesh Goyal 2 , 1 PG Research Scholar, Dept. of Civil Enggineering, MIET Kurukshetra, Haryana, India 2 Professor Dept. of Civil Enggineering, MIET Kurukshetra, Haryana, India ---------------------------------------------------------------------***--------------------------------------------------------------------- Abstract - The development of new roads, enhancement of existing roads and new runways are part of infrastructural boom in India. The foremost step in the design of road pavements has always been the geotechnical evaluation of sub-grade soil material, irrespective of whether it is used in filling or cutting..The significance of this parameter lies in the critical design parameters like CBR (as per IRC-37[1] and MORTH[2]). CBR (California bearing ratio), gives realistic results which aids the design process of new flexible pavements as well as the restoration of existing pavements all over the world. The conventional CBR test procedure has always been time consuming, relatively expensive and has generally low repeatability. The repeatability has been found extremely low when it comes to sensitive soils like Lacustrine soils, locally known as Kerawa soils in North India. All these hindrances indicate that the present study should be carried out using Dynamic Cone Penetrometer (DCP). The DCP has been widely used to evaluate the in-situ strength of undisturbed soil and compacted sub-grade materials. The present study aims at developing a correlation of DCP test values with the CBR test values for Lacustrine (sedimentary upland) soil formations so that a quick assessment of road sub-grades can be made. Analysis of experimental data indicated that there is a very good relationship of the measured soil strength (i.e., unsoaked California Bearing value and Dynamic cone penetration values) with the soil initial state factor as described by the combination of initial dry density, water content and void ratio. Comparison of measured and predicted values of soaked CBR and DCP using the developed equation clearly indicate the validity of equation. Key Words: California bearing ratio, Dynamic cone penetration, Lacustrine deposited soils , Hill or mountain forest soils. 1. INTRODUCTION The projects of road and infrastructure development have always been of great concern for the government of Jammu & Kashmir. The government allocates huge funds to various concerned departments like R&B (Roads and Buildings), PMGSY (Pradhan Mantri Gram Sadak Yojna) and other corporations for planning, construction, execution, development and maintenance of various road related projects within the state of J&K. The emphasis is led on the timely completion of projects which becomes a major concern for all the executing agencies. Every road project initiates from a very basic survey followed by sub-grade investigations which helps in the formation of DPR (detailed project report) later. 1.1 Types of soil in Kashmir valley 1.1.1. Degraded or grey brown podzolic soils: are of loam to clay texture at their surface and clay loam to clay texture at their sub-surface and of fine granular well developed angular block structure. 1.1.2. Hill or mountain forest soils: These are sandy loam to loamy, fine to weakly granular moderately alkaline (pH 7.4 – 8.4) and calcareous (4 to 10% calcium carbonate) soils. 1.1.3 Mountain meadow soils: They are alkaline (pH more than 7 – 9) and high in organic carbon. 1.1.4 Alluvial soils: They are situated in the flood plains of Ravi, Chenab, Jhelum and Sindh rivers and their tributaries. They are old and new alluvial soils. Old alluvial soil contain high amounts of Calcium Carbonate and are slightly to moderately alkaline (7.0–7.7) organic carbon between 0.28 – 0.61%. 1.1.5 Lacustrine deposited soils: These soils are deposited in lakes. Lacustrine deposited soils are laminated or varved in layers. 2. TESTS These tests was performed to know the coorelation between CBR and DCPT 2.1 Dynamic cone penetrometer test The Dynamic Cone Penetration Test (DCPT) is a widely-used and very simple test for evaluating soil compactness and load-bearing capacity and thus can be successfully for estimating the strength of soil.