Identification of Complex Blocks in the Corner of Underground Chamber

DOI

10.2991/mebe-15.2015.174How to use a DOI?

Keywords

underground chamber; corner; complex block; block theory.

Abstract

The combination of free planes in the corner of an underground chamber is complex. If the fractures cross the roof and walls, or floor and walls at the same time, a complex key block may exist. The theorem of finiteness in the classical block theory applies only to the convex block, and not to the non-convex. Based on the analysis of the system of spatial planes and the system of blocks, the operations of intersection and union between the half-spaces of surface planes are represented explicitly with two symbols. All the possible finite convex blocks can be analysed by enumeration at first. Then according to the theory of united blocks and the principles that the codes of fractures keep the same all the time, a complete combination of a non-convex block is determined. Further, cutting along the free planes which include concave intersections, the new combination, in which the convex blocks are connected only at the cutting planes, is optimized. Finally, the identification of complex block in the corner of an underground chamber is implemented. The case of practical engineering shows that, the method is correct and effective, and lay a solid theoretical foundation for the further study on the cases of edges or intersecting tunnel. The method also have some practical values to guarantee the safety of underground engineering.

Copyright

© 2015, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Jianyong Lia
AU  - Guangxiang Yuan
AU  - Yang Zhao
AU  - Anming Wang
AU  - Zhiquan Huang
PY  - 2015/04
DA  - 2015/04
TI  - Identification of Complex Blocks in the Corner of Underground Chamber
BT  - Proceedings of the 2015 International Conference on Materials, Environmental and Biological Engineering
PB  - Atlantis Press
SP  - 779
EP  - 784
SN  - 2352-5401
UR  - https://doi.org/10.2991/mebe-15.2015.174
DO  - 10.2991/mebe-15.2015.174
ID  - Lia2015/04
ER  -