Land Subsidence — A. A State-of-the-Art Review

摘要: Following a description of the phenomena land subsidence, its main features and occurrence in many parts world, review starts with simplest depth-porosity model models that are based on field data empirical relations. It then continues through theories physical concepts. The first studies these kind semi- infinite elastic solid which assume earth to behave like homogeneous, isotropic half space uniform elasticity modulus. A more rigorous approach subsidence includes transient flow equilibrium equations for isothermal reservoirs. solution this set coupled can be obtained either by full-coupling could quite lengthy or partial coupling separated into two subgroups: “leap frog” “two step” techniques. In “two-step” method, aquifer equation is solved three two-dimensional it assumed deformation one dimensional one-dimensional consolidation aquitards reservoir. results time dependent boundary conditions equations. An alternative explain behaviour given viscoelastic Theological constitutive instead an as employed technique. Later, using plastic stress- strain relation, horizontal displacements also reviewed. Finally, geothermal reservoir require additional energy discussed.