Faculty Publications
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Item Numerical Study on Interference of Surface Strip Footings Resting on Stiff Clay(Springer Science and Business Media Deutschland GmbH, 2020) Hridya, P.; Anaswara, S.; Shivashankar, R.In the present study, the interference effects of two closely spaced strip footings on the surface of stiff clay were investigated. The effect of interference on characteristic behaviour like bearing pressure, settlement and tilt is observed using two-dimensional plane strain analysis. Finite element analysis software PLAXIS 2D is used for this. The behaviour of individual footing on stiff clay is first established. Parametric study is done by varying the width of footing and the spacing between the footings. The results are presented in terms of efficiency factors, which are defined as the ratio of settlement or bearing pressure of interfering footing to that of the isolated footing. The effect of interference is particularly noticeable in terms of settlement. Maximum settlement and tilt occur at a spacing 1.5B irrespective of the footing width. Effect of shear keys placed beneath the footings at different locations beneath the footing and the interference of such footings were also studied. It is found that the presence of shear keys has a significant effect on the interference between the footings, compared to without the shear keys. © 2020, Springer Nature Singapore Pte Ltd.Item A Numerical Study on Interference Effects of Closely Spaced Strip Footings on Cohesionless Soils(Springer Science and Business Media Deutschland GmbH, 2021) Anaswara, S.; Shivashankar, R.Foundations of buildings often need to be placed at close spacings to meet the various structural or functional requirements. In such cases, the combined action of adjacent footings is different from that of a single foundation. The combined effect causes interference of the stress zones. Numerical analysis is carried out on two closely spaced strip footings on sands, by varying the affecting parameters, to study the interference effects. Interference effects are analysed in terms of bearing pressure, settlement and tilt of foundations. In this study, the interference effects of closely spaced strip footings on the surface of cohesionless soils are being investigated. Parametric studies are done for two foundations by varying the clear spacing between the foundations. The results are presented in terms of interference factors. New structures near to the old construction may alter the settlement, pressure and rotational characteristics of the old footing and could lead to its distress. Above all, the load-carrying capacity of the new foundation will be very different from what it would have carried if it were independent—without the interference of the other footing. First footing representing an already existing footing is loaded with half of the estimated failure load of single independent strip footing and second adjacent footing loaded up to failure. The effect of interference of the old foundation is observed to be particularly significant in terms of the settlement and tilt. © 2021, Springer Nature Singapore Pte Ltd.Item Study on Behaviour of Two Adjacent Strip Footings on Unreinforced/Reinforced Granular Bed Overlying Clay with Voids(Springer Science and Business Media Deutschland GmbH, 2021) Anaswara, S.; Shivashankar, R.This paper numerically studies the behaviour of two adjacent strip footings on unreinforced and reinforced granular bed (RGB) overlying clay having voids. The influence of different parameters such as granular bed thickness, length of reinforcement/s, number of layers of reinforcement, presence of void/s beneath the footing/s in the weak soil, on the behaviour of footings are carried out in this study. It is found that there is a certain optimum spacing between the two adjacent strip footings at which the footing/s carry the maximum load. The voids could be formed in weak soil due to various reasons and the presence of voids may affect the performance of footings. Such voids tend to reduce the load carrying capacity of the footing/s. However, providing a RGB over weak soil can be used as an effective method to maintain the good performance of footings, even when voids could be formed in future. © 2020, Springer Nature Switzerland AG.