Triaxial Compression Experimental Study on Post-Peak Deformation Characteristics of Rock Masses with Persistent Joints

Abstract:

Controlling the stability of surrounding rocks in underground excavations during in-depth resource development must be confronted with post-peak deformation and failure problems of jointed rock masses. This paper describes routine triaxial compression testing on standard cylinder specimen with persistent joints in different inclinations and under different confining pressures, and analyzes deformation characteristics of rock masses with persistent joints in different inclinations and under different confining pressures. Test results show that the peak strength, residual strength, and peak strain of the jointed specimen basically increase with increasing confining pressures but decrease with increasing joint inclinations. Test results well reflect that it is incorrect to evaluate deformation characteristics of jointed rock masses with continuum mechanics and research results provide a reference for the research on the stability of surrounding rocks in underground excavations.

• Periodical: Advanced Materials Research (Volumes 1030-1032)
• Pages: 1074-1077
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1030-1032.1074
• Online since: September 2014
• Authors: Yang Ping*, Shu Chen Li
• Keywords: Failure Mode, Poisson's Ratio, Post Peak, Rock Mass with Persistent Joints, Triaxial Compression Test, Volumetric Strain

References

[1] CAI Meifeng, HE Manchao, LIU Dongyan. Rock mechanics and engineering [M]. Beijing: Science Press, 2002：104-108. (in Chinese).

[2] LAJAI E Z. Shear strength of weakness planes in rock[J]. International Journal of Rock Mechanics and Mining Sciences, 1969, 6(5): 499-515.

DOI: 10.1016/0148-9062(69)90016-3

[3] GEHLE C, KUTTER H K. Breakage and shear behavior of intermittent rock joints[J]. International Journal of Rock Mechanics & Mining Sciences, 2003, 40(5): 687-700.

DOI: 10.1016/s1365-1609(03)00060-1

[4] SAVIAHTI T, NORDLUND E, STEPHANSSON O. Shear box testing and modeling of joint bridge [C] Rock Joints: Proceedings of the International Symposium on Rock Joints. Rotterdam: A. A. Balkema, (1990).

[5] BAI Shi-wei, REN Wei-zhong, FENG Ding-xiang, et a1. Failure mechanism and strength properties of rockmass containing close intermittent joints under plane stress condition [J]. Chinese Journal of Rock Mechanics and Engineering, 1999, 18(6): 635-640.

DOI: 10.4028/www.scientific.net/kem.353-358.1173

[6] Jaeger J.C., N.J.W. Fundamentals of Rock Mechanics [M]. Fourth Edition Chapmen and Hall, London, (2007).

[7] NASSERI M H, RAO K S, RAMAMURTHY T. Failure mechanism in schistose rocks[J]. International Journal of Rock Mechanics and Mining Sciences, 1997, 34(3/4)：219. e1-219. e15.

DOI: 10.1016/s1365-1609(97)00099-3

[8] NIANDOU H, SHAO J F, HENRY J P, et a1．Laboratory investigation of the mechanical behaviour of tournemire shale [J]．International Journal ofRock Mechanics and M ining Sciences, 1997, 34(1)：3-16.

DOI: 10.1016/s1365-1609(97)80029-9

[9] YANG Z F, CHEN J M, HUANG T H. Effect of joint sets on the strength and deformation of rock mass models[J]. International Journal of Rock Mechanics and Mining Sciences, 1998, 35(1)：75–84.

DOI: 10.1016/s1365-1609(98)80024-5

[10] Wawersik W. R., Fairhurt C. A study of brittle rock fracture in laboratory compression experiments. Int. J. RockMech. Min. Sc. i, 1970: 7: 516-575.