Details
| Original language | English |
|---|---|
| Pages (from-to) | 627-644 |
| Number of pages | 18 |
| Journal | Acta Geotechnica |
| Volume | 12 |
| Issue number | 3 |
| Publication status | Published - 2 Feb 2017 |
Abstract
This paper proposes a new method using centroid sliding pyramid (CSP) to identify the removability and stability of fractured hard rock in tunnel and slope engineering. The new method features two geometrical and topological improvements over the original key block method (KBM). Firstly, all the concave corners are considered as starting points of cutting process when a concave block is divided into a set of convex blocks in the original KBM. Only the concave corners formed by two joint planes are used for partitioning a concave block in the presented method and concave corners with free planes are excluded. Secondly, joint pyramid for removability computation in the original KBM is generated using all of the joint planes, while CSP is calculated only from the joint planes adjoining the free planes. The cone angle θ of CSP is the vectorial angle formed by the two candidate sliding surfaces of this CSP. Removability analysis of a block is transformed into calculating the cone angle of CSP. The geometrical relationship is simplified, and data size for removability computation is reduced compared with the original KBM. The provided method is implemented in a computer program and validated by examples of fractured rock slopes and tunnels.
Keywords
- Block theory, Free domain, Removability, Rock mass, Sliding pyramid, Stability analysis
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Geotechnical Engineering and Engineering Geology
- Earth and Planetary Sciences(all)
- Earth and Planetary Sciences (miscellaneous)
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In: Acta Geotechnica, Vol. 12, No. 3, 02.02.2017, p. 627-644.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Centroid sliding pyramid method for removability and stability analysis of fractured hard rock
AU - Wu, Wei
AU - Zhuang, Xiaoying
AU - Zhu, Hehua
AU - Liu, Xingen
AU - Ma, Guowei
N1 - Funding Information: The authors gratefully acknowledge the supports from the Key Programme from Natural Science Foundation of China (41130751), the Ministry of Science and Technology of China (Grant No. SLDRCE 14-A-09), Science and Technology Commission of Shanghai Municipality (16QA1404000) and Program for Changjiang Scholars and Innovative Research Team in University (PCSIRT, IRT1029). Publisher Copyright: © 2017, Springer-Verlag Berlin Heidelberg. Copyright: Copyright 2021 Elsevier B.V., All rights reserved.
PY - 2017/2/2
Y1 - 2017/2/2
N2 - This paper proposes a new method using centroid sliding pyramid (CSP) to identify the removability and stability of fractured hard rock in tunnel and slope engineering. The new method features two geometrical and topological improvements over the original key block method (KBM). Firstly, all the concave corners are considered as starting points of cutting process when a concave block is divided into a set of convex blocks in the original KBM. Only the concave corners formed by two joint planes are used for partitioning a concave block in the presented method and concave corners with free planes are excluded. Secondly, joint pyramid for removability computation in the original KBM is generated using all of the joint planes, while CSP is calculated only from the joint planes adjoining the free planes. The cone angle θ of CSP is the vectorial angle formed by the two candidate sliding surfaces of this CSP. Removability analysis of a block is transformed into calculating the cone angle of CSP. The geometrical relationship is simplified, and data size for removability computation is reduced compared with the original KBM. The provided method is implemented in a computer program and validated by examples of fractured rock slopes and tunnels.
AB - This paper proposes a new method using centroid sliding pyramid (CSP) to identify the removability and stability of fractured hard rock in tunnel and slope engineering. The new method features two geometrical and topological improvements over the original key block method (KBM). Firstly, all the concave corners are considered as starting points of cutting process when a concave block is divided into a set of convex blocks in the original KBM. Only the concave corners formed by two joint planes are used for partitioning a concave block in the presented method and concave corners with free planes are excluded. Secondly, joint pyramid for removability computation in the original KBM is generated using all of the joint planes, while CSP is calculated only from the joint planes adjoining the free planes. The cone angle θ of CSP is the vectorial angle formed by the two candidate sliding surfaces of this CSP. Removability analysis of a block is transformed into calculating the cone angle of CSP. The geometrical relationship is simplified, and data size for removability computation is reduced compared with the original KBM. The provided method is implemented in a computer program and validated by examples of fractured rock slopes and tunnels.
KW - Block theory
KW - Free domain
KW - Removability
KW - Rock mass
KW - Sliding pyramid
KW - Stability analysis
UR - http://www.scopus.com/inward/record.url?scp=85011590500&partnerID=8YFLogxK
U2 - 10.1007/s11440-016-0510-4
DO - 10.1007/s11440-016-0510-4
M3 - Article
AN - SCOPUS:85011590500
VL - 12
SP - 627
EP - 644
JO - Acta Geotechnica
JF - Acta Geotechnica
SN - 1861-1125
IS - 3
ER -