Cross-scale complicated geologic body ground stress field identification method and device

Abstract

The invention relates to a cross-scale complicated geologic body ground stress field identification method, and belongs to the technical field of geological engineering, rock mass engineering and numerical analysis. The cross-scale complicated geologic body ground stress field identification method comprises the following steps: an optimization model capable of identifying ground stress is established; a genetic algorithm is adopted for solving the optimization model so as to obtain protolith parameters and side pressure coefficients of a geologic body; the protolith parameters of the geologic body are substituted into a three-dimensional numerical model to obtain a stress field. A device used for implementing the method comprises an optimization model establishing module, a genetic algorithm calculation module and a ground stress field obtaining module, wherein the optimization model establishing module is used for establishing the optimization model capable of identifying the ground stress; the genetic algorithm is used for solving the optimization model to obtain the protolith parameters and the side pressure coefficients of the geologic body; the ground stress field obtaining module is used for substituting the protolith parameters of the geologic body into the three-dimensional numerical model so as to obtain the ground stress field. According to the cross-scale complicated geologic body ground stress field identification method and device, the initial ground stress field in the geologic body can be obtained, so that the problem that existing ground stress inversion theories and methods are limited by ground stress inversion of a cross-scale complicated geologic body.

Description

technical field [0001] The invention relates to the technical fields of geological engineering, rock mass engineering and numerical analysis, in particular to a method and device for identifying the stress field of complex geological bodies across scales. Background technique [0002] In-situ stress is the natural stress existing in the formation, and it is the internal force that leads to rock mass engineering deformation and damage and rockburst dynamic disasters. It is an important factor that must be considered in rock mass engineering stability analysis and disaster prevention and control. [0003] Geological bodies have experienced long geological tectonic movements and multiple geological transformations, and the residual tectonic forces of different periods are sealed in the strata. Different geological bodies are subjected to different geological action types, action degrees, action time, and experience times, resulting in spatial and temporal variability in the mag...

AI Technical Summary

Problems solved by technology

However, the existing inversion of in-situ stress has limitations. The inversion of in-situ stress based on neural network is either training and predicting the limited in-situ stress measurement results, or improving the in-situ stress prediction by enlarging the in-situ stress samples with the help of numerical models. Therefore, the existing geostress inversion theories and methods still have certain limitations for the geostress inversion of complex cross-scale geological bodies

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