Construction Of Roads For Black Cotton Soil

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INTRODUCTION :

Construction of roads in black cotton soil areas has been problematic due to their low bearing capacity and the detrimental effects of volume instability arising from swelling and shrinkage characteristics of such soils during wet and dry seasons.
Such problems assume greater acuteness where the water table is high and clayey subsoil stratum is thick.

A Perfect example of a case history study can be considered from “Gudivada-Bantumilli” State Highway, which passes through a plain terrain surrounded with paddy fields, and constructed on a black cotton soil embankment of 3mts height. The entire stretch of the road is located in the delta region of Godavari and Krishna rivers, of the south eastern part of India. The pavement on the embankment was in a state of extreme distress. Lateral shift and settlement in embankment were the common soil failure features observed. TWO METHODOLOGIES USING LIME :

Method 1 – Injection of Lime Slurry

Method 2 – Placement of Lime Piles

Method 1 : To verify the efficacy of the technique, laboratory experiments were conducted at “Central Road Research Institute -
India” on a test embankment of 2.5m x 2.0m x 2.5m made from the locally available silty soil having a dry density of 16 kN/m2. Lime slurry was injected in one side of the embankment. The injected lime contained 30% lime by weight in the mixture of lime-water.

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