Papers by Supia Khatun AU
The Intermediate River Bank Protection Technique in Critical Geo-fluvial Conditions Using Jute Rope Grid
Indian geotechnical journal, Feb 2, 2024
The Bearing Capacity and Settlement Study of Eccentrically Loaded Circular and Rectangular Shallow Footing on Granular Soil
A number of research works on bearing capacity and settlement characteristics of eccentrically lo... more A number of research works on bearing capacity and settlement characteristics of eccentrically loaded shallow foundations in both cohesion-less and cohesive soil have been carried out considering different influencing parameters. The past investigations were mostly based on either combination of numerical model with analytical study or only physical model studies. In the present investigation a series of experimental model tests have been carried out to study the load -settlement characteristics of model footings in cohesion-less soil along with a numerical model study. The model tests have been carried out on rectangular and circular footings with four different load eccentricity conditions and for depth of embedment (Df/B) =0, 0.5,1. For better understanding of the trends of experimental results a numerical analysis have been carried out using PLAXIS 3D. From the experimental results it is revealed that the ultimate bearing capacity of both rectangular and circular footings decrea...
This paper presents the influence of geotechnical properties of bank material, hydraulic paramete... more This paper presents the influence of geotechnical properties of bank material, hydraulic parameters representing flow characteristics and geomorphology of a river for planning and designing of river bank protection methodology for the rivers and sea coasts. In this paper a brief discussion on the type of protection techniques and their design guidelines have been made. After detail understanding of mechanism and cause of failure of river bank, its protection techniques should be designed. Stability of river banks is expressed by its maximum shear strength which it can withstand against different driving forces. To ascertain the dominating cause of river bank failure, analysis has to be carried out considering both geotechnical and fluvial aspects. This paper provides guidelines for planning and designing of bank protection measures for river bank. Existing design methodologies for different types of revetments are also briefly discussed in this paper. In West Bengal the characterist...
An Experimental Study on the Influence of Water-Level Fluctuation on Stability of Slope of Model River Bank Composed of Cohesionless Material
Lecture Notes in Civil Engineering, 2021
International Journal of River Basin Management, 2018
This paper presents an experimental investigation on the stability of a model river bank composed... more This paper presents an experimental investigation on the stability of a model river bank composed of homogeneous cohesionless soil under rapid drawdown condition. The effects of major influencing parameters controlling Factor of Safety (FoS) of a river bank under depletion of water level have been considered in the present study. A series of laboratory model studies have been carried out to investigate the cases of drawdown rate and drawdown ratios rendering the bank to maximum damage. Moreover, the effect of water level drawdown on the response variables namely pore water pressure, deformation of the bank profile, and shear strength of bank material have been observed and analysed. Stability analysis of the experimental model banks under drawdown conditions was carried out by evaluating FoS using the principle of reduced shear strength methodology. The in-situ total shear strength after each drawdown was measured using a laboratory vane shear apparatus. The minimum shear strength among these values has been identified. Now the FoS against each drawdown ratio has been computed from the ratio of total shear strength obtained after drawdown for that particular drawdown ratio to the minimum shear strength as obtained. This experimental programme examined the optimum combination of drawdown rate and drawdown ratio causing mass failure of the bank. It was revealed from the variation of pore pressure after drawdown that changes of pressures at points close to the toe of the bank slope is strongly controlled by the stress-state induced by drawdown. From the failure observations it was found that the drawdown rate is the dominating cause of maximum deformation of the bank than that of drawdown ratio. The findings of the present research work may help in predicting the actual failure scenario and stability condition of prototype river under similar boundary conditions.
Telecommunications and Radio Engineering, 2004
In the present study, a SiO 2 /water nanofluid with a mass fraction of 1% was employed as a coola... more In the present study, a SiO 2 /water nanofluid with a mass fraction of 1% was employed as a coolant, and its the effect on the performance of a symmetric, square flat-plate solar collector was experimentally investigated. The experiments were performed under the ASHRAE standard without any surfactants. The effect of the nanofluid on the collector efficiency was examined with respect to the solar radiation, mass flow rate, and temperature variation. The results indicate that compared with pure water, the SiO 2 /water nanofluid enhanced the thermal efficiency and temperature performance. Moreover, the collector was more efficient with the nanofluid than with water owing to the solar radiation and mass flow rate.
Stability Analysis of River Dyke in Estuarine Environment
Indian Geotechnical Journal, 2017
River dyke stability in estuarine environment is greatly influenced by the river stage fluctuatio... more River dyke stability in estuarine environment is greatly influenced by the river stage fluctuations due to spring and neap tide variation in the zone of influence. The proposed river dyke will be located along the Nayachara island at the Rangafalla and Haldia end for protection of the proposed navigational channel across Nayachara, West Bengal, India. The navigational channel will connect the shipping route from Rangafalla to Haldia dock which the Kolkata Port Trust (KoPT) proposes as a long term solution for the shipping route to Haldia bypassing the existing troublesome route via Auckland and Jellingham, in order to reduce annual maintenance dredging burden to KoPT. The river dyke will be constructed artificially using sand as main core material. The soil profile of the site consists of mixture of river borne sand, silt and clay. The present site is located in a complex estuarine environment and the island has been formed due to siltation of very recent origin in geologic scale (about 70 years old). In this paper, stability analysis of proposed dyke for protection of the channel across Nayachara Island has been carried out using conventional limit equilibrium method and finite element method, considering the fluctuation of water level due to tidal effect. The factor of safety has been found out considering both drained and undrained conditions, simulating long term and short term stability of the dyke, respectively.
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Papers by Supia Khatun AU