Conference proceeding
The Support Design for Slope and Tunnel Engineering Based on Block Theory
9th International Conference On Analysis of Discontinuos Deformation: New Developments and Applications, pp.351-358
9th International Conference on Analysis of Discontinuous Deformation - New Developments and Applications, 9th (Singapore, 25/11/2009–27/11/2009)
2009
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Abstract
The support design is of great importance in the fields of underground projects, such as slope excavation and tunnel engineering. So it is important to develop rules for the performance checking of the support design. Till now, many models have been developed to simulate the rock mass system, and several rules have been developed to check the performance of the system. The Q-system and rock mass rating (RMR) are the traditional methods used in underground projects. The Q-system of rock mass classification was developed by Barton, Lien and Lunde in 1974. In Q-system rock mass classification, six parameters including Deere’s Rock Quality Designation (RQD), joint set number (Jn), joint roughness number (Jr), joint alteration or filling (Ja), joint water leakage or pressure (Jw) and Stress Reduction Factor (SRF), are used to characterize the rock mass quality. Three key aspects of the rock mass such as block size (RQD/Jn), inter block shear strength (Jr/Ja) and active stress (Jw/SRF) are comprehensively considered by the Q-system. The RMR rock mass classification was developed by Bieniawski (1976). In RMR classification, six parameters including uniaxial compressive strength of intact rock material, Rock Quality Designation (RQD), joint spacing, joint condition, ground water condition, joint orientation, are used to determine the rock mass quality.</p><p>The six parameters, in Q-system and RMR rock mass classification, can cover almost all the rock mass classifications. However, it’s really difficult to exclude the value of these parameters from one specimen, and only geological experts can confirm the value of all the six parameters. So it’s necessary to develop a theory to express the rock mass system with easy-to-obtain parameters.</p><p>Block theory, developed by Genhua Shi in 1985, can be used to check the performance of the support design. Using the block theory, five parameters including cohesion, friction, dip and dip direction of joints and rock density, are used to characterize the performance of the rock mass system. The values of these parameters are easy to get and it is unique to one specimen. Only the instability of the block should be considered. So block theory is a promising method to check the performance of the support design.
In this paper, the block theory was used to study the support design in underground projects. It is easier to check the performance of the support design compared with the traditional methods, which may be significant in the application of the slope and tunnel engineering in underground projects.
Details
- Title
- The Support Design for Slope and Tunnel Engineering Based on Block Theory
- Creators
- Jiao Liqing (Author) - Nanyang Technological UniversityMa Guowei (Corresponding Author) - Nanyang Technological UniversityHe Lei (Author) - Nanyang Technological UniversityGuoyang Fu (Author) - Nanyang Technological University
- Contributors
- Guowei Ma (Editor) - University of Western AustraliaYingxin Zhou (Editor)
- Publication Details
- 9th International Conference On Analysis of Discontinuos Deformation: New Developments and Applications, pp.351-358
- Conference
- 9th International Conference on Analysis of Discontinuous Deformation - New Developments and Applications, 9th (Singapore, 25/11/2009–27/11/2009)
- Publisher
- Research Publishing; Singapore
- Number of pages
- 8
- Identifiers
- 991013297354302368
- Copyright
- © 2021 Research Publishing (S) Pte Ltd. All rights reserved.
- Academic Unit
- Faculty of Science and Engineering; Engineering
- Language
- English
- Resource Type
- Conference proceeding