Damaged Plasticity Theory and its Application in Studying on Fractured Rock

Abstract:

Fractured rock mass is one of the most important engineering materials for civil engineering in rock mass and rock layer, and has special failure model and constitutive relationship different from other man-made materials. A new numerical model is introduced and applied in studying the deformation, strength, and the failure mode of fractured rock mass, with the consideration of the damaged plasticity theory for intact rock, and joints distribution in fractured rock mass. A series of numerical experiments on jointed rock mass samples are performed to verify the validity of the new numerical model for fractured rock sample. Some feature datum from lab experiment is used to compare the results from numerical tests by the new model. According to these results, the initiation and propagation of induced fracture, and the failure mode of the fractured rock mass samples, are agreed with their associated feature datum by lab experiments.

• Periodical: Applied Mechanics and Materials (Volumes 105-107)
• Pages: 1534-1538
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.105-107.1534
• Online since: September 2011
• Authors: Zhi Qiang Zhang, Ning Li, Fang Fang Chen
• Keywords: Damaged Plasticity Theory, Failure Mode, Fractured Rock Mass, Peak Strength

References

[1] E.T. Brown and D.H. Trollope, Strength of a model of jointed rock. J. Soil Mech. Found Div ASCE 961970: 685-704.

DOI: 10.1061/jsfeaq.0001411

[2] Bobet A, Einstein H. H. Numerical modeling of fracture coalescence in a model rock material. International Journal of Fracture 1998; 92 (3): 221-252.

[3] Einstein H. H, Stephansson O. Fracture systems, fracture propagation and coalescence. Geoeng-2000 – An international Conference on Geotechnical & Geological Engineering. Melbourne, Australia 2000: 1348-1388.

[4] Tiwari R. P., Rao K. S. Post failure behaviors of a rock mass under the influence of triaxial and true triaxial confinement. Eng Geo 2006; 84: 112-129.

DOI: 10.1016/j.enggeo.2006.01.001

[5] M. Prudencio, M. Van Sint Jan. Strength and failure modes of rock mass models with non-persistent joints. International Journal of Rock Mechanics & Mining Sciences 2007; 44: 890-902.

DOI: 10.1016/j.ijrmms.2007.01.005

[6] M. Cai and H. Horii, A constitutive model and FEM analysis of jointed rock masses, Int. J. Rock Mech. Min. Sci. Geomech. Abstr. 1993; 30: 351-359.

DOI: 10.1016/0148-9062(93)91719-y

[7] Bobet, A. and Einstein, H. H. Fracture coalescence in rock-type materials under uniaxial and biaxial compression. Int. J. Rock Mech. Min. Sci. Geomech. Abstr. 1998; 35(7): 863-889.

DOI: 10.1016/s0148-9062(98)00005-9

[8] Reyes O, Einstein H. H. Failure mechanisms of fractured rock – A fracture coalescence model. Proceedings of 7th International Congress on Rock Mechanics, Aachen, Germany 1991: 333-340.

[9] S. Maghous, D. Bernaud, J. Fre ard, D. Garnier. Elastoplastic behavior of jointed rock masses as homogenized media and finite element analysis. International Journal of Rock Mechanics & Mining Sciences 2008; 45: 1273-1286.

DOI: 10.1016/j.ijrmms.2008.01.008