Relationship between subsurface geology and ground subsidence of Bangkok metropolis Thailand

Abstract

Bangkok city, the capital of Thailand which has many engineering and environmental problems due to ground subsidence was selected as the main study object in this research study. The study included data collection, bore hole logging and investigations on some important underground geotechnical parameters to prepare thickness maps, static water level maps, ground elevation and subsidence maps of Bangkok subsoil. Thickness of both fine grained compressible clay layers and that of coarse grained non compressible sand layers are highly varying from place to place and they are highly deformed. Area of eastern Bangkok is affected by the highest ground subsidence and this area is underlain by the thickest portion of both first and second compressible clay layers. The lowest static water levels of upper most aquifers is also overlain by this area. The uppermost two compressible clay layers contribute more percentage for ground subsidence.