Geotechnical conditions of the deltaic alluvial plains of Bangladesh and associated problems: Fid-Bau Portal

Geotechnical conditions of the deltaic alluvial plains of Bangladesh and associated problems

Mollah, Mohammad A.

Abstract A broad assessment of the geotechnical characteristics of the subsoil of the deltaic alluvial plains of Bangladesh is made to provide a useful guide for development planning and construction. The subsoil generally comprises sandy material, although it may vary significantly over short lateral distances as a result of frequent and erratic occurrences of compressible organic silt and peat mixtures. The foundation competency of the upper 6–10 m has been assessed as low to very low. Uniform-textured fine sand with a moderate to high bearing capacity usually dominates the soil profile, particularly below 20 m depth, but in swampy area this is totally absent. Potential construction problems, categorized as geotechnical and environmental are been described. The former include foundation problems in buildings, bridges, hydraulic structures etc., attributed to the weak and erratic nature of the surficial soil. Geotechnical problems are often compounded by the physiographical and geomorphological environment of the country. Flood and river bank erosion are identified as the main environmental problems, posing an enormous threat to life, property and construction. Recommendations to overcome these problems are made.