The evolution regularity and influence factor analysis of zonal disintegration around deep jointed rock mass: a numerical study based on DEM

Tunnel mechanics mainly depend on joints properties in layered and jointed rock mass, and most of the present methods adopted in numerical analysis are distinct element method. Combining to the Gaixiaba tunnel, considering the jointed properties such as dip angles, distances and lateral pressure coefficient, the finite element models are made in this paper. Results show that the plastic zone and total displacement presented a symmetric distribution with the axial of joints dip, and the plastic zone is very similar to the results suggested by Goodman. The dip angles, distances of joints and lateral pressure coefficient have significant effect on the tunnel mechanics.

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Propagation Law of Stress Wave and Cracks in Non-penetrating Jointed Rock Mass: A Numerical Study Based on Particle Flow Code

Geotechnical and Geological Engineering ◽

10.1007/s10706-020-01271-z ◽

2020 ◽

Vol 38 (4) ◽

pp. 3967-3981

Author(s):

Hao Zhou ◽

Changdi He

Keyword(s):

Rock Mass ◽

Stress Wave ◽

Numerical Study ◽

Jointed Rock ◽

Jointed Rock Mass ◽

Particle Flow ◽

Particle Flow Code ◽

Propagation Law

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Numerical Study of the Influence of Joint Angle on the Failure Behavior of Randomly and Nonpersistently Jointed Rock Mass

Arabian Journal for Science and Engineering ◽

10.1007/s13369-020-04361-5 ◽

2020 ◽

Vol 45 (5) ◽

pp. 4023-4036

Author(s):

Wenqiang Ma ◽

Tongxu Wang

Keyword(s):

Rock Mass ◽

Joint Angle ◽

Numerical Study ◽

Jointed Rock ◽

Jointed Rock Mass ◽

Failure Behavior

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Experimental and Numerical Study of the Uniaxial Compressive Stress-Strain Relationship of a Rock Mass with Two Parallel Joints

Archives of Civil Engineering ◽

10.2478/ace-2019-0019 ◽

2019 ◽

Vol 65 (2) ◽

pp. 67-80

Author(s):

L. X. Xiong ◽

H. Y. Yuan ◽

Y. Zhang ◽

K. F. Zhang ◽

J. B. Li

Keyword(s):

Compressive Strength ◽

Rock Mass ◽

Uniaxial Compressive Strength ◽

Numerical Study ◽

Jointed Rock ◽

Jointed Rock Mass ◽

Rock Bridge ◽

Vertical Loading ◽

Joint Fracture ◽

Dip Angle

AbstractA “rock bridge”, defined as the closest distance between two joints in a rock mass, is an important feature affecting the jointed rock mass strength. Artificial jointed rock specimens with two parallel joint fractures were tested under uniaxial compression and numerical simulations were carried out to study the effects of the inclination of the rock bridge, the dip angle of the joint, rock bridge length, and the length of joints on the strength of the jointed rock mass. Research results show: (1) When the length of the joint fracture, the length of the rock bridge, and the inclination of the rock bridge stay unchanged, the uniaxial compressive strength of the specimen gradually increases as the inclination of the joint fracture increases from 0°to 90°. (2) When the length of the joint fracture, the length of the rock bridge, and the inclination of the joint fracture stay unchanged, the uniaxial compressive strength of the specimen shows variations in trends with the inclination of the rock bridge increasing from 30° to 150° (3). In the case when the joint is angled from the vertical loading direction, when the dip angle of the joint fracture, the inclination of the rock bridge, and the length of the rock bridge stay unchanged, the uniaxial compressive strength of the specimen gradually decreases with an increasing length of joint fracture. When the dip angle of the joint fracture, the inclination of the rock bridge, and the length of the joint fracture stay unchanged, the uniaxial compressive strength of the specimen does not show a clear trend with an increase of the length of the rock bridge.

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