Experimental and Numerical Study on Reinforcement of Foundations Using Micropiles as a Retrofitting Measure

Malik, Bilal Ahmad; Mandhaniya, Pranjal; Shah, Mohammad Yousuf; Sawant, V. A.

doi:10.1007/s13369-022-07454-5

Cited by 8 publications

(2 citation statements)

References 35 publications

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“…It is observed from Figure 11 that for optimal blend of (1.2% NS + 9% RHA)/9% RHA, the ratio of cost for this blend is lower than the ratio of stifness and strength parameters as presented in Figs. 5,6,7,8. Beyond this optimal blend, the stifness ratio decreases and the cost ratio increases making the blends uneconomical, e.g., 12% + 1.5% NS blend is uneconomical as it shows lower stifness and strength ratios due to dispersive efects and higher cost ratio.…”

Section: Resultsmentioning

confidence: 99%

“…Sustainable embankment materials are desired globally by geotechnical experts from durability, cost-efectiveness, and optimization perspectives for civil engineering infrastructures [1][2][3][4][5][6][7][8][9][10]. Urbanization around the world is going on fast-track [11] due to which the problematic soils sites are also in demand for soils improvement (stabilization).…”

Section: Introductionmentioning

confidence: 99%

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Micro to Nanolevel Stabilization of Expansive Clay Using Agro-Wastes

Munawar

Khan

Rehman

et al. 2023

Advances in Civil Engineering

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The circular economy encourages the production and consumption of sustainable embankment geomaterials and their blends utilizing recycled waste materials in roads, railway tracks, airfields, and underground structures. Geomaterials comprising high-plastic soft expansive clay pose excessive settlement during cyclic traffic/railway/airfield loading resulting in uneven geometry of overlying layers. This paper demonstrates multiobjective optimized improvement of expansive clay (C) geotechnical characteristics by cost-effective agro-wastes additives at microlevel (by 3% to 12% rice husk ash, i.e., RHA), nanolevel (by 0.6% to 1.5% rice husk derived green nano-SiO2, i.e., NS), and synergistic micro to nanolevel (NS-RHA). The swell potential, resilient modulus (MR), initial elastic modulus (Es), unconfined compressive strength (UCT), and California bearing ratio (CBR) of C and its blends were determined. The chemical characterization of C and its blends were conducted through Fourier transform infrared spectroscopy (FTIR) and optical microscopic tests. The outcome of this study depicted that the cost ratio for the optimized composite, i.e., (1.2% NS-9% RHA)/(9% RHA) is 1.22 whereas stiffness ratio MR (NS-RHA)/MR(RHA) and Es (NS-RHA)/Es(RHA) and strength ratio UCT(NS-RHA)/UCT(RHA) and CBR(NS-RHA)/CBR(RHA) were found to be 2.0, 1.64, 2.17, and 2.82, respectively. FTIR revealed the chemical compatibility between C, RHA, & NS from durability perspective. Cost-stiffness results of this study can be applied by geotechnical experts to economize the green stabilization of C by use of agro-waste for sustainable development.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Micro to Nanolevel Stabilization of Expansive Clay Using Agro-Wastes

Munawar

Khan

Rehman

et al. 2023

Advances in Civil Engineering

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Consolidation Effect on the Behavior of Micropiled Rafts Under Combined Loading: Case Study

et al. 2023

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This paper used finite element modeling to evaluate the consolidation effect on the performance of existing rafts underpinned with micropiles under combined vertical and lateral loads. For this purpose, a real-life case study was discussed, in which micropile underpinning was used to stop the continuous tilt of a 13-floor residential building supported by a surface raft. It was found that the building tilted towards the northeast direction because of the consolidation of a deep soft clay layer under the northeast building corner. After discussing the as-built micropiling system, a 3D numerical model, developed using the PLAXIS software, was used to conduct the numerical research. The time-dependent behavior of the raft with and without the consideration of micropiles was assessed. Moreover, the variation of load-sharing ratios with time was investigated. The numerical results emphasize that the underpinning process was effective and reduced the final raft rotation and maximum settlement by 79.9% and 73.9%, respectively, compared to the case of the absence of micropiles. The consolidation process under a steady level of vertical loads enhanced the performance of the micropiled and unmicropiled rafts against upcoming lateral loads. The vertical load-sharing ratio increased during a life span of 20 years by 10.4% due to the consolidation process, but the increase was at a decreasing rate. Comparing all the four directions in which the lateral load was applied, the micropiles carried (57.4–76.6%) of the lateral load.

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Performance of Rectangular Footing on Loose Sand Reinforced with Micropiles

Dutta

Pandit

2023

Indian Geotech J

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Experimental and Numerical Study on Reinforcement of Foundations Using Micropiles as a Retrofitting Measure

Cited by 8 publications

References 35 publications

Micro to Nanolevel Stabilization of Expansive Clay Using Agro-Wastes

Micro to Nanolevel Stabilization of Expansive Clay Using Agro-Wastes

Consolidation Effect on the Behavior of Micropiled Rafts Under Combined Loading: Case Study

Performance of Rectangular Footing on Loose Sand Reinforced with Micropiles

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