A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Progressive Failure of Blocky Rock System: Geometrical–Mechanical Identification and Rock-Bolt Support
https://orcid.org/0000-0002-5268-4702
Abstract Excavation of shallow-buried, hard rock masses usually leads to the instability of rock blocks delimited by discontinuity planes. Classic block theory only deals with the stability of rock blocks on the exposed surfaces. However, in rock engineering practice, it is quite common that when surface unstable blocks collapse along with their constraints to adjacent blocks released, more inner blocks will be exposed to the surface and become unstable or fall down. This process is termed the progressive failure of blocky rock mass. Based on three-dimensional (3D) block-cutting analysis, the removable blocks in progressive failure process can be determined through geometrical and kinematics analysis. This study proposes to further identify unstable key blocks from removable blocks using mechanical analysis. On this basis, the anchoring force required for all of randomly distributed key blocks is calculated, and the spatial distribution of the required anchoring force per unit area of the free surface are analyzed, with suitable probability distribution obtained. Afterwards, adopting reliability-based design concept, the design scheme for systematic rock bolting to prevent progressive failure of blocky rock mass is discussed, and the method is presented for estimating the anchoring force of individual rock bolt, bolt spacing, and anchorage length.
Highlights Progressive failure of blocky rock is analyzed through the geometrical-mechanical identification of key blocks.A new approach to assess the required anchoring force per unit area of rock excavation surface is proposed.Systematic rock-bolting design scheme for coping with progressive failure is presented and discussed.
Progressive Failure of Blocky Rock System: Geometrical–Mechanical Identification and Rock-Bolt Support
https://orcid.org/0000-0002-5268-4702
Abstract Excavation of shallow-buried, hard rock masses usually leads to the instability of rock blocks delimited by discontinuity planes. Classic block theory only deals with the stability of rock blocks on the exposed surfaces. However, in rock engineering practice, it is quite common that when surface unstable blocks collapse along with their constraints to adjacent blocks released, more inner blocks will be exposed to the surface and become unstable or fall down. This process is termed the progressive failure of blocky rock mass. Based on three-dimensional (3D) block-cutting analysis, the removable blocks in progressive failure process can be determined through geometrical and kinematics analysis. This study proposes to further identify unstable key blocks from removable blocks using mechanical analysis. On this basis, the anchoring force required for all of randomly distributed key blocks is calculated, and the spatial distribution of the required anchoring force per unit area of the free surface are analyzed, with suitable probability distribution obtained. Afterwards, adopting reliability-based design concept, the design scheme for systematic rock bolting to prevent progressive failure of blocky rock mass is discussed, and the method is presented for estimating the anchoring force of individual rock bolt, bolt spacing, and anchorage length.
Highlights Progressive failure of blocky rock is analyzed through the geometrical-mechanical identification of key blocks.A new approach to assess the required anchoring force per unit area of rock excavation surface is proposed.Systematic rock-bolting design scheme for coping with progressive failure is presented and discussed.
Progressive Failure of Blocky Rock System: Geometrical–Mechanical Identification and Rock-Bolt Support
https://orcid.org/0000-0002-5268-4702
Abstract Excavation of shallow-buried, hard rock masses usually leads to the instability of rock blocks delimited by discontinuity planes. Classic block theory only deals with the stability of rock blocks on the exposed surfaces. However, in rock engineering practice, it is quite common that when surface unstable blocks collapse along with their constraints to adjacent blocks released, more inner blocks will be exposed to the surface and become unstable or fall down. This process is termed the progressive failure of blocky rock mass. Based on three-dimensional (3D) block-cutting analysis, the removable blocks in progressive failure process can be determined through geometrical and kinematics analysis. This study proposes to further identify unstable key blocks from removable blocks using mechanical analysis. On this basis, the anchoring force required for all of randomly distributed key blocks is calculated, and the spatial distribution of the required anchoring force per unit area of the free surface are analyzed, with suitable probability distribution obtained. Afterwards, adopting reliability-based design concept, the design scheme for systematic rock bolting to prevent progressive failure of blocky rock mass is discussed, and the method is presented for estimating the anchoring force of individual rock bolt, bolt spacing, and anchorage length.
Highlights Progressive failure of blocky rock is analyzed through the geometrical-mechanical identification of key blocks.A new approach to assess the required anchoring force per unit area of rock excavation surface is proposed.Systematic rock-bolting design scheme for coping with progressive failure is presented and discussed.
Progressive Failure of Blocky Rock System: Geometrical–Mechanical Identification and Rock-Bolt Support
Zhang, Qi-Hua (author) / Liu, Qing-Bing (author) / Wang, Shu-Hong (author) / Liu, Hong-Liang (author) / Shi, Gen-Hua (author)
2022
Article (Journal)
Electronic Resource
English
BKL:
38.58
Geomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
38.58$jGeomechanik
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB41
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