Three-dimensional variable-parameter full-coupling simulation calculation method for ground subsidence caused by load and underground water exploitation

Abstract

The invention provides a three-dimensional variable parameter full-coupling simulation calculation method for ground subsidence and ground fissures caused by load and underground water exploitation. The problem of calculation of the ground subsidence and the ground fissures under the dual action of overlying load on a soil body and underground water exploitation is solved. The geological conceptual model is established according to the actual background of underground water exploitation. Based on a Biot consolidation theory, full coupling of a seepage field and a stress field is realized, and a three-dimensional full-coupling numerical model for predicting ground settlement and ground fracture development is constructed. According to the calculation method, a mechanism in a rock-soil body compression process is considered, constitutive models of elasticity, viscoelasticity and viscoplasticity are coupled, and a seepage field and a stress field are closely linked by combining changes of rock-soil body parameters, so that the ground settlement amount and the ground fracture extension amount under the conditions of ground load and groundwater dynamic decline can be simultaneously simulated, and a basis is provided for researching seepage field evolution and ground subsidence evolution laws and a fluid-solid coupling action mechanism in the underground water exploitation process.

Description

technical field [0001] The invention relates to the field of geological environment protection and restoration, in particular to a method and technology for full coupling simulation and calculation of three-dimensional variable parameters of ground subsidence and ground fissures caused by load and groundwater exploitation. Background technique [0002] Land subsidence is a phenomenon in which the underground rock and soil skeleton is compressed and the ground elevation slowly decreases within a certain range under the influence of natural conditions or human activities, which seriously affects the safety of high-rise buildings, highways, high-speed rail and other buildings. Ground fissures are also a derivative phenomenon of land subsidence. Among many influencing factors, the excessive exploitation of groundwater and the increase of engineering load are the most important factors causing land subsidence. The current prediction methods for land subsidence are mainly the reg...

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Problems solved by technology

However, the above two models have certain advantages in the study of the impact of groundwater exploitation on land subsidence. When there is an overlying load on rock and soil, its accuracy is difficult to guarantee.

The traditional fluid-solid coupling model mainly considers the superposition effect of seepage field and stress field, and does not fully consider the three-dimensional fully coupled model of rock and soil parameter changes and constitutive model changes during the process of load and groundwater migration.

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