Numerical Study on Micropile Stabilized Foundation in Flyash
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TECHNICAL NOTE
Numerical Study on Micropile Stabilized Foundation in Flyash Irfan Ahmad Shah1 Kausar Ali1
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Mohammad Zaid1
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Mohd Ahmadullah Farooqi2
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Received: 3 January 2020 / Accepted: 17 November 2020 Ó Indian Geotechnical Society 2020
Abstract Because of the scarcity of land for urbanization, multistoried construction projects are becoming a preferred choice. Such projects more often require soil reinforcement or ground improvement to strengthen the soil and reduce the foundation settlement of structure to meet the project demanding standards. Micropiles have been used as one of the simplest ground improvement methods for a long time. The micropile also finds its applicability in the retrofitting of old structural foundations. The present study has been carried out for laboratory scaled model to investigate the efficiency of the micropiles to strengthen the soil and reduce the foundation settlement of structure constructed on Indian flyash. The efficiency of micropiles has been studied when used as a group, for stress versus displacement characteristic of the surface footing. Next, a 2D finite element analysis of the same model has also been carried out in GeoStudio 2016. The efficiency of micropile groups has been investigated for the slenderness ratio of micropile with value as 60, 80, 100 and 120. The study concluded that the slenderness ratio of micropile has a substantial
& Irfan Ahmad Shah [email protected] Mohammad Zaid [email protected] Mohd Ahmadullah Farooqi [email protected] Kausar Ali [email protected] 1
Department of Civil Engineering, Aligarh Muslim University, Aligarh 202002, India
2
Department of Building Engineering, College of Architecture and Planning, Imam Abdulrahman Bin Faisal University, Dammam, Kingdom of Saudi Arabia
effect on the bearing capacity of flyash. Moreover, quantitative improvement in the bearing capacity of the flyash has been determined in terms of a factor known as bearing capacity ratio (BCR). The BCR value is found to be greater than 1 in each studied case of the micropile group having a different slenderness ratio. Keywords Micropiles Finite element analysis GeoStudio Bearing capacity ratio
Introduction Strengthening of the soils to increase the bearing capacity through the various types of reinforcement methods has been investigated by many researchers [1]. However, the use of horizontal reinforcement is especially restricted for new constructions, since the excavation of soil becomes the prime requirement for the insertion of horizontal reinforcement. Therefore, the use of vertical reinforcement can be treated as an efficient and most popular way of ground improvement. Several studies have reported significant improvement in the load–displacement of the footing constructed on sand subgrade using vertical reinforcement [2–7]. The micropiles were first developed in Italy in the early 1950s, by Dr. Fernando Lizzi, as a structural member for the retrofitting of damaged buildings. However, the engineering demand for the stabi
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