A simple approach to the elasto-plastic coupling analyses of circular tunnels in confining pressure-dependent strain-softening rock masses

Qiang Zhang; Cheng Li; Qiang Guo; Ming Min; Yanning Wang; Binsong Jiang

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자료유형: 학술저널

저자정보: Qiang Zhang (China University of Mining and Technology) Cheng Li (China University of Mining and Technology) Qiang Guo (China University of Mining and Technology) Ming Min (China University of Mining and Technology) Yanning Wang (China University of Mining and Technology) Binsong Jiang (China University of Mining and Technology)

저널정보: 한국자원공학회 Geosystem Engineering Geosystem Engineering Vol.20 No.5

발행연도: 2017.1

수록면: 261 - 270 (10page)

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The conventional strain-softening behaviors which assume the strength parameters as the functions of the plastic strain have been studied using various methods. However, rock-like materials have also been found to manifest pressure-dependent behavior for both elastic and plastic rock masses. The realization of the radial stress was found to be continuous, and gradually increased from supporting stress to in situ stress for the circular openings under hydrostatic pressure. The radial stress was spaced as numbers of sections, and each annulus was considered as an ideal plastic rock mass. The close-formed analytical solutions of each annulus can be easily obtained. Therefore, using the displacement continuum and stress boundary conditions, the dimensionless radius corresponding to the spaced radius could be derived. The radial stress and plastic shear strain at the inner radius of the outer adjacent annulus were employed to describe the material property evolution law. Then, the radii could be recursively obtained. Finally, for the conventional strain-softening rock masses, the pressure-dependent elastic rock and elasto-plastic coupling strain-softening rock masses were employed to validate the proposed approach. In this study, having completed the above steps, it was concluded that the results were in accordance with the numerical methods.

참고문헌 (19)

참고문헌 신청

Alejano, L. R. / 2005 / Considerations of the dilatancy angle in rocks and rock masses / International Journal of Rock Mechanics and Mining Sciences 42:481~507

Brown, E. T. / 1982 / Rock-support interaction calculations for pressure shafts and tunnels / Proceedings of the 1982 ISRM Symposium :26~28

Brown, E. T. / 1983 / Ground response curves for rock tunnels / Journal of Geotechnical Engineering 109:15~39

Brown, E. T. / 1989 / Influence of stress-dependent elastic moduli on stresses and strains around axisymmetric boreholes / Rock Mechanics and Rock Engineering 22:189~203

Han, J. X. / 2013 / A procedure of strain-softening model for elasto-plastic analysis of a circular opening considering elasto-plastic coupling / Tunnelling and Underground Space Technology 37:128~134

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