Study on the Distribution Law of Crustal Stress in Fault Fracture Area

Determining crustal stress is crucial in the design and construction of underground engineering projects, particularly in fault fracture zones. This paper aims to identify the characteristic factors that influence the crustal stress of faults, including the difference in deformation characteristics...

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Bibliographic Details
Published in:Applied sciences 2023-06, Vol.13 (13), p.7678
Main Authors: Fu, He-Lin, Xu, Wu, Wu, Yi-Min
Format: Article
Language:English
Subjects:
Acoustics
Boundary conditions
Crust
crustal stress
Deformation
distribution pattern
Earth
Elastic deformation
Engineering
fault area
Fault detection
Fault lines
Fractures
Geological faults
Geology
Hydraulic fracturing
Mechanical properties
Modulus of elasticity
numerical simulation
Rock mechanics
Stress
Stress distribution
Working conditions
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Summary:Determining crustal stress is crucial in the design and construction of underground engineering projects, particularly in fault fracture zones. This paper aims to identify the characteristic factors that influence the crustal stress of faults, including the difference in deformation characteristics between faults and ordinary formations (expressed by the elastic modulus ratio Er/Ef), the degree of fault fragmentation P, and the angle α between fault tendency and the principal stress direction. Numerical simulations are conducted to investigate the impact of these three factors on the magnitude and direction of the principal stress. Additionally, measured stress values from a specific tunnel are analyzed to validate the findings. The results demonstrate the crucial role of α in determining the increase or decrease of principal stress and the direction of the offset. When α is less than 45°, σ1 and σ3 within the fault experience an increase, while σ1 and σ3 in the ordinary surrounding rock area near the fault exhibit a slight decrease. Moreover, the σ1 direction inside the fault deviates towards the parallel fault, whereas σ1 near the outside slightly deviates towards the vertical fault. Conversely, when α is greater than 45°, the trend of principal stress is reversed. Er/Ef affects the magnitude of the principal stress change, with larger values resulting in more pronounced changes. P only affects the stress distribution inside the fault.
ISSN:2076-3417
2076-3417
DOI:10.3390/app13137678