Liquifaction – a Geotechnical Engineering Challenge In Pavement Construction
G. V. Praveen1, S. Goverdhan Reddy2
1G. V. Praveen, Professor, Department of Civil Engineering, S R Engineering College, Warangal, Telangana, India.
2S. Goverdhan Reddy, Assistant Professor, Department of Civil Engineering, S R Engineering College, Warangal, Telangana, India.
Manuscript received on 10 December 2018 | Revised Manuscript received on 17 December 2018 | Manuscript Published on 30 December 2018 | PP: 23-27 | Volume-8 Issue- 2S December 2018 | Retrieval Number: BS2643128218/19©BEIESP
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open-access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: The primary function of subgrade is to provide a stable foundation for over lying layers of flexible pavement. Hence, the long–term performance of flexible pavement structures is considerably affected by the stability of the underlying soil layers. In general, in-situ subgrade soils may not provide the adequate support to attain satisfactory performance under various traffic loading and environmental demands. Pavement performance is merely dependent on properties of screening materials used to fill the voids of aggregate. It is required that at no time soil subgrade is overstressed. Further, it is supposed to be compacted to the desirable density and near the optimum moisture content. The prime reason for their failure was attributed to the use of low quality soils known as marginal soils. Marginal soils have been used at several pavement project sites due to non–availability of select soils. It is also reported that the pavements may be severely affected due the low quality soils are being allowed in the construction in view of the growing scarcity for granular subgrade soils. Unsuitable highway sub grade soil requires stabilization to improve its properties. The strength behavior of sub grade could be improved by stabilization with lime or fly ash. It can potentially lessen ground improvement costs by adopting this method of stabilization. This process is not only cost effective, but it also lessens the demand on non-renewable resources and reduces the environmental footprint of a road construction project. Further, it is reported that, one of the factors of concern is the failure of pavements due to liquefaction. When liquefaction occurs, the strength of the soil decreases and the ability of a soil deposit to supporting pavements, foundations for buildings and bridges are reduced. In this study an attempt is made to modify the properties of the marginal soil that can be improved by adding lime and fly ash. Also, to modify and reduce the plasticity index of the marginal soil; consequently, the workability of the marginal soil is examined, thus making marginal soils more effective under liquefaction.
Keywords: Marginal Soil; Stabilization; Liquefaction; Pavement Construction; Workability.
Scope of the Article: Computational Techniques in Civil Engineering