The Inversion Method Applied to the Stress Field around a Deeply Buried Tunnel Based on Surface Strain

To identify the magnitude and direction of in situ stress in deeply buried tunnels, an inversion method for the stress field was proposed based on a finite number of measurement points of surface strain. Firstly, elastic strain data of finite points on the surface of tunnel surrounding rock were acq...

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Bibliographic Details
Published inApplied sciences Vol. 13; no. 22; p. 12507
Main Authors Yan, Xiaobing, Hao, Qiqi, Yang, Rui, Peng, Jianyu, Zhang, Fengpeng, Tan, Sanyuan
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.11.2023
Subjects
Accuracy
Algorithms
Analysis
Arrays
borehole stress relief method
Boundary conditions
Computer simulation
Deformation
Equilibrium
Error analysis
genetic algorithm
Genetic algorithms
Hydraulic fracturing
Methods
Neural networks
SMARS
Software
Strain gauges
Stress measurement
surface strain
surrounding rock stress field
Tunnels
China
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Summary:To identify the magnitude and direction of in situ stress in deeply buried tunnels, an inversion method for the stress field was proposed based on a finite number of measurement points of surface strain. Firstly, elastic strain data of finite points on the surface of tunnel surrounding rock were acquired using the borehole stress relief method at the engineering site. Secondly, a finite element model of the tunnel surrounding rock with plastic damage was established, and the parameters of the finite element model were substituted using the SIGINI subroutine. Then, an improved Surrogate Model Accelerated Random Search (SMARS) was developed using genetic algorithm programming on the MATLAB™ platform to invert and attain the globally optimal boundary conditions. Finally, the obtained optimal boundary conditions were applied to the numerical model to calculate the stress distribution in the engineering site. The reliability of this method was validated through a three-dimensional example. The method has been successfully applied to the stress-field analysis of deep tunnels in Macheng Iron Mine, Hebei Province, China. The research results show that this method is a low-cost, reliable approach for stress-field inversion in the rock around a tunnel.
ISSN:2076-3417
2076-3417
DOI:10.3390/app132212507