River Bank Erosion of the Surma River Due to Slope Failure

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Research areas:
Year:
2014
Type of Publication:
Article
Keywords:
Surma River, Sylhet, Soil Sample, Slope Failure, Soil Erosion
Authors:
Md. Shofiqul Islam; Farjana Hoque
Journal:
IJRIES
Volume:
1
Number:
2
Pages:
54-58
Month:
November
BibTex:
Abstract:
The Sylhet city is located on the bank of the Surma River in Bangladesh is the most beautiful city with natural bounty. Bank erosion is a common problem for city dwellers and land owners due to unsupported bank. Dry and wet in-situ soil sample were analyzed in the laboratory to find out the major cause of bank erosion. Soil samples are silty clay with friction angle 40° and 24° at dry and wet condition, respectively. We the measured Poisson’s ratio, cohesion, and Young’s Modulus are 0.4, 2.75 KPa, and 20KPa, respectively, for dry samples. For wet condition, however, these values are 0.4, 2.75 KPa, and 20KPa, respectively. Finally, slope stability analyses using both liquid equilibrium and finite element method show that the river banks are eroding mainly due to slope failure in the wet condition. The factor of safety (FS) and shear Reduction Factor (SRF) values is more than 1 at dry condition while it is ~0.7 at wet condition.