A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Experimental investigation of fracture behavior of rock-like materials containing 3D embedded flaws subjected to direct and unloading normal stress shear action
Abstract In this study, a new method for generating embedded flaws in rock-like material samples is proposed. A series of shear tests are carried out on samples with one or two embedded penny flaws to research the crack growth, strength, and deformation characteristics of discontinuous jointed rock under shear condition. The results show that the fracture of samples under unloading normal shear test is more catastrophic than that of direct shear test. Moreover, the shear scratches only appear on the tensile fracture surfaces. Furthermore, the pre-existing flaw inclinations, shear directions, and normal unloading paths have a large effect on the shear strength of rock-like samples containing pre-existing embedded flaws. Compared with unloading normal stress shear group and direct shear group, a higher relative roughness coefficient of fracture surface is appeared in samples under unloading normal stress shear test. The magnitude of normal stress unloading determines the failure mode of rock-like samples containing pre-existing flaws. It is also observed that the failure process of the direct shear test is gradual failure, while the failure of the normal unloading test is instantaneous failure. The instantaneous failure results in faster energy release and more catastrophic failure of samples.
Experimental investigation of fracture behavior of rock-like materials containing 3D embedded flaws subjected to direct and unloading normal stress shear action
Abstract In this study, a new method for generating embedded flaws in rock-like material samples is proposed. A series of shear tests are carried out on samples with one or two embedded penny flaws to research the crack growth, strength, and deformation characteristics of discontinuous jointed rock under shear condition. The results show that the fracture of samples under unloading normal shear test is more catastrophic than that of direct shear test. Moreover, the shear scratches only appear on the tensile fracture surfaces. Furthermore, the pre-existing flaw inclinations, shear directions, and normal unloading paths have a large effect on the shear strength of rock-like samples containing pre-existing embedded flaws. Compared with unloading normal stress shear group and direct shear group, a higher relative roughness coefficient of fracture surface is appeared in samples under unloading normal stress shear test. The magnitude of normal stress unloading determines the failure mode of rock-like samples containing pre-existing flaws. It is also observed that the failure process of the direct shear test is gradual failure, while the failure of the normal unloading test is instantaneous failure. The instantaneous failure results in faster energy release and more catastrophic failure of samples.
Experimental investigation of fracture behavior of rock-like materials containing 3D embedded flaws subjected to direct and unloading normal stress shear action
Zhao, Yu (author) / Teng, Mingyang (author) / Bi, Jing (author) / Li, Zheng (author) / Liu, Pengfei (author) / Wang, Chaolin (author)
2022
Article (Journal)
Electronic Resource
English
BKL:
56.00$jBauwesen: Allgemeines
/
38.58
Geomechanik
/
38.58$jGeomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
56.00
Bauwesen: Allgemeines
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB18
| Taylor & Francis Verlag | 2022
Shear sliding of rough-walled fracture surfaces under unloading normal stress
| DOAJ | 2023