Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Evolution Law of Tensile-Shear Fracture and Deformation of Variously Shaped Roadways
https://orcid.org/0000-0001-9338-6480
Abstract To study the fracture evolution of variously shaped soft rock roadways under hydrostatic pressure, numerical simulations were performed using the finite-discrete element method (FDEM), thereby comparing and analyzing the stress and tensile-shear fracture evolution and deformation characteristics of soft rock roadways of six different section shapes: rectangular, trapezoidal, circular, elliptical, straight-wall arched, and horseshoe-shaped. Circular roadways were found to be the most stable among the six types of roadway sections under hydrostatic pressure. The stress concentration after excavation is generated in the curvature of the section and the corner formed by the abrupt change in slope, and the shear fracture is initially developed from the location of stress concentration and extends through at an angle of 45°-φ/2 in the direction of the maximum principal stress. Tension fractures develops between shear fractures as well as in the direction of the maximum principal stress, dividing the surrounding rock in the pressure relief zone into small-sized blocks. Stress concentration is primarily responsible for the development of shear fractures, and the brief stress rebound during an increase or decrease in stress is the main reason for the tension fracture of the surrounding rock.
Evolution Law of Tensile-Shear Fracture and Deformation of Variously Shaped Roadways
https://orcid.org/0000-0001-9338-6480
Abstract To study the fracture evolution of variously shaped soft rock roadways under hydrostatic pressure, numerical simulations were performed using the finite-discrete element method (FDEM), thereby comparing and analyzing the stress and tensile-shear fracture evolution and deformation characteristics of soft rock roadways of six different section shapes: rectangular, trapezoidal, circular, elliptical, straight-wall arched, and horseshoe-shaped. Circular roadways were found to be the most stable among the six types of roadway sections under hydrostatic pressure. The stress concentration after excavation is generated in the curvature of the section and the corner formed by the abrupt change in slope, and the shear fracture is initially developed from the location of stress concentration and extends through at an angle of 45°-φ/2 in the direction of the maximum principal stress. Tension fractures develops between shear fractures as well as in the direction of the maximum principal stress, dividing the surrounding rock in the pressure relief zone into small-sized blocks. Stress concentration is primarily responsible for the development of shear fractures, and the brief stress rebound during an increase or decrease in stress is the main reason for the tension fracture of the surrounding rock.
Evolution Law of Tensile-Shear Fracture and Deformation of Variously Shaped Roadways
https://orcid.org/0000-0001-9338-6480
Abstract To study the fracture evolution of variously shaped soft rock roadways under hydrostatic pressure, numerical simulations were performed using the finite-discrete element method (FDEM), thereby comparing and analyzing the stress and tensile-shear fracture evolution and deformation characteristics of soft rock roadways of six different section shapes: rectangular, trapezoidal, circular, elliptical, straight-wall arched, and horseshoe-shaped. Circular roadways were found to be the most stable among the six types of roadway sections under hydrostatic pressure. The stress concentration after excavation is generated in the curvature of the section and the corner formed by the abrupt change in slope, and the shear fracture is initially developed from the location of stress concentration and extends through at an angle of 45°-φ/2 in the direction of the maximum principal stress. Tension fractures develops between shear fractures as well as in the direction of the maximum principal stress, dividing the surrounding rock in the pressure relief zone into small-sized blocks. Stress concentration is primarily responsible for the development of shear fractures, and the brief stress rebound during an increase or decrease in stress is the main reason for the tension fracture of the surrounding rock.
Evolution Law of Tensile-Shear Fracture and Deformation of Variously Shaped Roadways
Luo, Feng (Autor:in) / Gao, Shuai (Autor:in) / Zhang, Shun (Autor:in) / Hu, Jiaqi (Autor:in) / Dong, Enyuan (Autor:in) / Li, Meng (Autor:in)
2023
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
BKL:
57.00$jBergbau: Allgemeines
/
38.58
Geomechanik
/
57.00
Bergbau: Allgemeines
/
56.20
Ingenieurgeologie, Bodenmechanik
/
38.58$jGeomechanik
/
56.20$jIngenieurgeologie$jBodenmechanik
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