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Land subsidence and earth fissures are phenomena related to groundwater\udwithdrawal in a sedimentary basin. If the rock basement or basin lithology\udis irregular, both vertical and horizontal displacements can be induced due\udto differential settlement and tensile stresses appearing in the soil mass.\udIf the differential settlement is of sufficient magnitude, earth fissuring\udcan occur within tensile zones. The magnitudes of compaction and fissure\udgeometry are closely related to the thickness and skeletal compressibility\udof fine-grained sediments within the aquifer system. Land subsidence and\udearth fissuring were modeled by employing a two-dimensional (2-D) coupled\udseepage and stress-strain finite element analysis. The basin bedrock\udgeometry, lithological variation, measurements of surface displacements, and\udchanges in hydraulic head were the critical input parameter for the\udsubsidence modeling. Simulation results indicate that strain had exceeded\udthe approximate threshold for fissure formation of 0.02 to 0.06 %  in\udthe area of the identified fissures. The numerical model was used to predict\udfuture subsidence and potential earth fissures for flood control structures\udwithin the metro Phoenix area

Modeling of earth fissures caused by land subsidence due to groundwater withdrawal