Two-dimensional stress field inversion method and system for different weights of normal stress and shear stress

Abstract

The invention relates to a two-dimensional stress field inversion method and system for different weights of normal stress and shear stress. The method comprises the steps of acquiring stress parameter measurement information of different measurement points; establishing a finite element numerical analysis model according to the engineering geological information, respectively applying loads in different directions in the two-dimensional space, and respectively determining stress calculation values at the measuring points under the action of the corresponding loads; establishing a two-dimensional crustal stress field inversion objective function model and performing inversion analysis to obtain stress calculation values and stress regression coefficients at the measurement points under different weights; and establishing an error formula for evaluating the inversion effect of the crustal stress field and determining an optimal target crustal stress field. The problem that the shear stress is easily ignored due to the numerical magnitude difference between the shear stress and the normal stress is solved, the precision of the ground stress field obtained through inversion is greatlyimproved, the distribution characteristics of the ground stress field can be accurately, reliably and efficiently obtained, and a technical support is provided for scientifically identifying the deformation and damage characteristics of the excavated chamber surrounding rock.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering and numerical analysis, in particular to a two-dimensional stress field inversion method and system with different weights of normal stress and shear stress. Background technique [0002] With the rapid development of social economy and the implementation of the western development strategy, the construction of water conservancy and hydropower projects, transportation, national defense and other fields in my country is intensively carried out. The development trend of super long and extra large. Engineering practice shows that in-situ stress is the fundamental force that causes the deformation and destruction of surrounding rock in underground engineering. With the increasing attention to engineering safety issues, it is necessary to study the distribution characteristics of in-situ stress in engineering areas in advance, which has become a It is one of the hot spots and important...

AI Technical Summary

Problems solved by technology

Since the shear stress in the stress tensor is much smaller than the normal stress, especially for deep buried projects, there may even be an order of magnitude difference. If this method is still used, the shear stress fitting will be placed in a secondary or even neglected position, thus It is easy to misjudgment the damage characteristics of the surrounding rock of the chamber, which is extremely harmful to the safety and construction of the project

However, there are relatively few achievements in this area, and an in-situ stress field inversion method that reasonably reflects the influence of normal stress and shear stress weight has not yet been established.

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