Browsing by Author "Muthukkumaran, Kasinathan"

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    Assessment of innovative dented sheet liner on the improvement of hydraulic properties of pervious concrete pile
    (Elsevier B.V., 2021-05-14) Umanath, U; Muthukkumaran, Kasinathan
    The Pervious Concrete Pile (PCP) is a technique that has emerged as an innovative method to improve radial consolidation and the bearing capacity of soft soils. The PCP, a stiffer vertical column (pile), has voids on the surface that accelerate the radial consolidation and eventually improve soft soils' bearing capacity. Since the PCP is stiffer material, the performance does not depend on the confined soil, unlike other drains. As the rate of radial consolidation hinges on the drain's hydraulic conductivity, ensuring the permeability of PCP along its total length is essential. An innovative method of dented sheet liner has been introduced in this study to improve the hydraulic conductivity of PCP. This method was introduced to create surface roughness and regular voids along the length of PCP. Malleable material like aluminium has been dented with specified patterns as a liner on the inner surface and introduced along with conventional formwork, which shall be removed after the concrete's final setting time. A series of laboratory experiments such as compressive strength, split tensile strength, porosity, and falling head permeability tests were performed on PCP cast using dented sheet liners. The results were compared with the conventional PCP properties to establish the efficiency of dented sheet liner in improving the hydraulic conductivity of pervious concrete. The results show that using dented sheet liners, the hydraulic properties porosity and permeability of PCP have been increased up to 22.5% and 79%, respectively, with minimum reduction in the strength parameters.
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    Estimation of lateral capacity of rock socketed piles in layered soil-rock profile
    (Springer, 2021-04-20) Prakash, A.R.; Muthukkumaran, Kasinathan
    Large diameter rock socketed piles were preferred for the purpose of transmission of a huge volume of both vertical and lateral load from superstructure to a deeper depth safely without any structural defects. A series of experimental program was conducted on model pile for studying the behaviour of the rock socketed pile under static lateral load in a soil-rock layered profile system. The model piles were instrumented with displacement and force transducers for measuring the magnitude of the pile movement and load transferred by the pile. The experimental results showed that the rock socketed pile lateral capacity has significantly affected by the depth of embedment of the pile in soil and depth of rock socket. There was a considerable increase in the lateral capacity of the pile when the depth of socketing is three times the diameter of the pile into rock with a minimum embedment. In the 3D socketed piles, the lateral capacity of the pile is almost 18 times higher than the non-socketed piles. From the experimental study, it is also observed that when the piles socketed more in to the hard strata (rock), the depth of fixity increases and the lateral displacement reduces substantially. © 2021, The Author(s).
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    Improvement of liquefaction resistance and cyclic response of sandy soil by air injection method
    (Chinese Academy of Sciences, 2026-04-21) Das, Rima; Muthukkumaran, Kasinathan
    Inducing partial saturation within the soil matrix has emerged as an effective approach to enhancing liquefaction resistance in fully saturated sands. Conventional methods for mitigating liquefaction susceptibility often involve substantial costs, complex implementation procedures, and potential environmental implications. This study investigates the enhancement of cyclic liquefaction resistance in sandy soils through induced partial saturation by air injection. Undrained cyclic triaxial tests under stress control were carried out on specimens in fully saturated, air-injected, and partially saturated states, considering a range of relative densities and loading configurations. The effect of air injection pressure and desaturation on the cyclic response was systematically examined. Liquefaction resistance curves and safety factors against liquefaction were evaluated for different earthquake records. Furthermore, a comparative analysis of the dynamic characteristics of fully saturated and partially saturated sand specimens was conducted to investigate the effect of saturation levels on their cyclic response. The experimental results validated the increased liquefaction resistance achieved through the induction of partial saturation. Moreover, the results demonstrated a notable decline in generated excess pore water pressure corresponding to a reduction in the degree of saturation to 95%. The liquefaction resistance ratio (CRR) increased significantly with a saturation level of 75%, irrespective of relative density. Furthermore, the target degree of saturation (Srtarget) was determined for loose to medium-dense relative density. © 2026 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences
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    Non-linear performance analysis of free headed piles in consolidating soil subjected to lateral loads
    (Elsevier B.V., 2020-10-15) Sivaraman, S; Muthukkumaran, Kasinathan
    The analysis of laterally loaded pile is complex due to its site specific behaviour. Whereas most of the analytical methods provides only a generalized solution to it. Behaviour of piles in clay depends on site specific factors like subsoil condition, type of super-structure and the load transfer from it, construction duration and ground improvement process. The present study deals with the assessment of lateral load behaviour of pile based on the results of conventional and instrumented field load tests. The pile was designed based on the results of laboratory and field geotechnical investigations. The diameter and depth of bored cast in-situ pile were fixed as 600 mm and 16 m from the natural ground level respectively. The deflection profile obtained using inclinometer for various lateral loads on piles tested during different phases of site development were analyzed. The pile bending moment, shear force and soil reaction profile were established from the inclinometer data. The results obtained from the experimental data were found to be comparable with that of analytical method. The non-linear lateral load-displacement curves obtained from the load test conducted at different period of consolidation induced by site development process were analyzed. The curves thus obtained were transferred into a non-dimensional kh/khmax versus shear strain curve for the formation of equation explicit to the specific site. A site specific equation was proposed for the estimation of lateral load-displacement curve with respect to degree of consolidation of the surrounding soil subjected to surcharge load induced by the site development process.
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    Rainfall-Induced Slope Instability in Tropical Regions Under Climate Change Scenarios
    (Multidisciplinary Digital Publishing Institute (MDPI), 2025-05-06) Kumar, Rajendra P.; Muthukkumaran, Kasinathan; Sharma, Chetan; Shukla, Anoop Kumar; Sharma, Surendra Kumar
    The reduction in the stability of rock slopes due to rainfall is a significant issue in tropical regions. Unsaturated soil, commonly found on hill slopes, provides higher shear strength compared to saturated soil due to matric suction. Soil moisture plays a crucial role in determining slope stability during rainfall events, yet it is often overlooked in geotechnical engineering projects. This study integrates both steady-state and transient analyses to examine how rainfall intensity affects the stability of a rock slope near a tunnel portal. Transient seepage analysis was conducted using SEEP/W to simulate changes in pore water pressure (PWP) resulting from rainfall infiltration under historical and future precipitation conditions. The analysis considers medium (SSP245) and worst-case (SSP585) climate change scenarios as per Coupled Model Intercomparison Project Phase 6 (CMIP6). The findings underscore the significant impact of rainfall-induced infiltration on slope stability and highlight the importance of incorporating soil moisture dynamics in slope stability assessments. The safety factor, initially 1.54 before accounting for rainfall effects, decreases to 1.34 when the effects of rainfall are included. © 2025 by the authors.