Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
A precursor of bedding rockslide: rock spalling in the key block triggered by tensile cracks
https://orcid.org/0000-0003-0426-2828
Abstract A rock mass sliding along one controlling bedding plane is a shear failure that occurs under compressive stress. The failure mechanism is relevant to the propagation and coalescence of cracks in the rock bridge. A direct shear test was used to examined samples containing one preexisting crack to investigate the initiation, propagation, and coalescence of cracks. These cracking behaviors were analyzed by a charge-coupled device camera, the acoustic emission (AE), and a resistance strain gauge. Linear elastic fracture mechanics were applied to analyze the crack initiation in theory. In the study, the deformation and AE count rate were increased before failure. Simultaneously, shear spalling occurs in this process. This phenomenon shows that shear spalling is a precursor to failure. The spalling triggered by tensile cracks is similar to the in situ rock mass failure that explained the failure mechanism of the key block in the Jiweishan rockslide. The mechanical behavior shows that rockfalls induced by tensile cracks are a precursor to failure. Additionally, the degree of spalling is affected by the continuity factor of the preexisting crack. The failure modes are affected by normal stress and the preexisting crack length. This research provides theoretical support for predicting the stability of a bedding rock mass containing one key block.
A precursor of bedding rockslide: rock spalling in the key block triggered by tensile cracks
https://orcid.org/0000-0003-0426-2828
Abstract A rock mass sliding along one controlling bedding plane is a shear failure that occurs under compressive stress. The failure mechanism is relevant to the propagation and coalescence of cracks in the rock bridge. A direct shear test was used to examined samples containing one preexisting crack to investigate the initiation, propagation, and coalescence of cracks. These cracking behaviors were analyzed by a charge-coupled device camera, the acoustic emission (AE), and a resistance strain gauge. Linear elastic fracture mechanics were applied to analyze the crack initiation in theory. In the study, the deformation and AE count rate were increased before failure. Simultaneously, shear spalling occurs in this process. This phenomenon shows that shear spalling is a precursor to failure. The spalling triggered by tensile cracks is similar to the in situ rock mass failure that explained the failure mechanism of the key block in the Jiweishan rockslide. The mechanical behavior shows that rockfalls induced by tensile cracks are a precursor to failure. Additionally, the degree of spalling is affected by the continuity factor of the preexisting crack. The failure modes are affected by normal stress and the preexisting crack length. This research provides theoretical support for predicting the stability of a bedding rock mass containing one key block.
A precursor of bedding rockslide: rock spalling in the key block triggered by tensile cracks
https://orcid.org/0000-0003-0426-2828
Abstract A rock mass sliding along one controlling bedding plane is a shear failure that occurs under compressive stress. The failure mechanism is relevant to the propagation and coalescence of cracks in the rock bridge. A direct shear test was used to examined samples containing one preexisting crack to investigate the initiation, propagation, and coalescence of cracks. These cracking behaviors were analyzed by a charge-coupled device camera, the acoustic emission (AE), and a resistance strain gauge. Linear elastic fracture mechanics were applied to analyze the crack initiation in theory. In the study, the deformation and AE count rate were increased before failure. Simultaneously, shear spalling occurs in this process. This phenomenon shows that shear spalling is a precursor to failure. The spalling triggered by tensile cracks is similar to the in situ rock mass failure that explained the failure mechanism of the key block in the Jiweishan rockslide. The mechanical behavior shows that rockfalls induced by tensile cracks are a precursor to failure. Additionally, the degree of spalling is affected by the continuity factor of the preexisting crack. The failure modes are affected by normal stress and the preexisting crack length. This research provides theoretical support for predicting the stability of a bedding rock mass containing one key block.
A precursor of bedding rockslide: rock spalling in the key block triggered by tensile cracks
Qin, Chang’an (Autor:in) / Chen, Guoqing (Autor:in) / Zhu, Jing (Autor:in) / Tang, Peng (Autor:in)
2020
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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
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