Related Experiment Video
Updated: Sep 12, 2025

Detection and Quantification of Tunneling Nanotubes Using 3D Volume View Images
Published on: August 31, 2022
A hybrid quantitative approach for assessment of geotechnical hazards in rock tunnels using finite element and
1Department of Mining Engineering, Hamedan University of Technology, Hamedan, Iran. sasan_gh22@yahoo.com.
Abstract:
Due to the uncertainty of geomechanical parameters, it is necessary to investigate the risks arising from geotechnical hazards in tunnel design from a statistical perspective. In this study, a hybrid quantitative approach incorporating uncertainty in geomechanical parameters, the finite element method (FEM), and the variation coefficient method (VCM) was employed to investigate geotechnical hazards in the Alborz tunnel. At first, by considering five statistical intervals [µ, µ + 0.5(SD), µ-0.5(SD), µ + SD, and µ-SD], different values of geomechanical parameters including uniaxial compressive strength of intact rock, density, depth, Young's modulus and tensile strength of rock mass, cohesion, friction angle, and in situ stress ratio were generated for three formations of the tunnel. Next, five numerical simulations were performed for each formation using the finite element method. The outputs of the FEM analysis, including the maximum displacement, the maximum axial force in the support systems, and the major principal stress around the tunnel, were used to calculate the three geotechnical hazards namely squeezing potential, seismic activity effects, and stress concentration around the tunnel. The results showed that the vulnerability index for squeezing potential has the highest value in each geological formation. The results of this study and the presented approach can be used as a hybrid model for investigating and predicting hazards in rock tunnels. Additionally, this approach reduces the negative impact of uncertainty in geomechanical parameters on safe and economical design in underground spaces.
More Related Videos
Related Concept Videos
Dynamic Modulus of Elasticity of Concrete
The sonic test is a common method to determine the dynamic modulus. In this test, a concrete beam, sized either 6 x 6 x 30 inches or 4 x 4 x 20 inches, is clamped at its center. Vibrations are initiated at one end of the beam by an electromagnetic exciter unit powered by...
Indeterminate Structure
Design Consideration
The factor of safety is another key...
Elasticity in Concrete
Yield Criteria for Ductile Materials under Plane Stress
The Maximum Shearing Stress Criterion, also known as...
Design Example: Analyzing Capacity Contours for Flood Risk Assessment

