Abstract
The sustainable performance of foundations of various urban buildings and infrastructures is strongly affected by groundwater level (GWL), as GWL causes changes in the stress state within soil. In the present study, the components affecting GWL were investigated, focusing on the effects of precipitation and river stage. These components were analyzed using a six-year database established for hydrological and groundwater monitoring data. Five study regions for which daily measured precipitation, river stage, and GWL data were available were compared. Different periods of precipitation, geographical characteristics, and local surface conditions were considered in the analysis. The results indicated that key influence components on GWL are different depending on the hydrological, geological, and geographical characteristics of the target regions. River stage had the strongest influence on GWL in urban areas near large rivers with a high ratio of paved surface. In rural areas, where the paved surface area ratio and soil permeability were low, the moving average showed a closer correlation to GWL than river stage. A moving average-based method to predict GWL variation with time was proposed for regions with a low ratio of paved surface area and low permeability soils.
Highlights
Load-carrying capability and deformation are key design components of various buildings and infrastructures to ensure the proper level of serviceability during the lifetime of the structures
There are no apparent indications of failure or collapse conditions, changes in groundwater level (GWL) can cause a considerable amount of ground subsidence and instant instability problems, all of which are related to the functionality and performance of target structures [2,3]
GWL in groups A and B fluctuated within river stage, while the patterns of fluctuated within time periods in a similar manner to variation in river stage
Summary
Load-carrying capability and deformation are key design components of various buildings and infrastructures to ensure the proper level of serviceability during the lifetime of the structures. These design components are strongly affected by the stress state within soil, which varies with groundwater level (GWL), resulting in changes in soil effective stress and pore water pressure [1]. Various investigations into the effects of GWL on the performance of foundation structures have been performed, and design methods to take GWL into account have been proposed [4,5,6,7] The results from these investigations indicated that incorporation of GWL into the design is essential to guarantee the sustainable performance of structures and to prevent unexpected damage during the lifetime of the structures due to additional settlement or reductions in bearing capacity.
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