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Mechanics of land subsidence due to groundwater pumping
Author(s) -
Budhu Muniram,
Adiyaman Ibrahim Bahadir
Publication year - 2009
Publication title -
international journal for numerical and analytical methods in geomechanics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.419
H-Index - 91
eISSN - 1096-9853
pISSN - 0363-9061
DOI - 10.1002/nag.863
Subject(s) - groundwater , geology , geotechnical engineering , aquifer , soil mechanics , water table , settlement (finance) , groundwater related subsidence , subsidence , soil water , structural basin , soil science , geomorphology , world wide web , computer science , payment
This paper presents the formulation of the basic mechanics governing the changes in stress states from groundwater pumping and comparisons among predicted land subsidence from this mechanics with existing analyses and field data. Land subsidence is a growing, global problem caused by petroleum and groundwater withdrawal, mining operations, natural settlement, hydro‐compaction, settlement of collapsible soils, settlement of organic soils and sinkholes. This paper is concerned with the land subsidence due to groundwater level decline by groundwater pumping. It is shown that the stress state consists of asymmetric stresses that are best simulated by a Cosserat rather than a Cauchy continuum. Land subsidence from groundwater level decline consists of vertical compression (consolidation), shear displacement and macro‐rotation. The latter occurs when conditions are favorable (e.g. at a vertical interface) for the micro‐rotation imposed by asymmetric stresses to become macro‐rotation. When the length of the cone of depression is beyond √2 times the thickness of the aquifer, simple shear on vertical planes with rotation is the predominant deformation mode. Otherwise, simple shear on horizontal planes is present. The predicted subsidence using the mechanics developed in this paper compares well with data from satellite‐borne interferometric synthetic aperture radar. Copyright © 2009 John Wiley & Sons, Ltd.