Abstract
This work is devoted to characterization of the deformation and strength properties of cataclastic sandstones. Before conducting mechanical tests, the physical properties were first examined. These sandstones are characterized by a loose damaged microstructure and poorly cemented contacts. Then, a series of mechanical tests including hydrostatic, uniaxial, and triaxial compression tests were performed to study the mechanical strength and deformation of the sandstones. The results obtained show nonlinear stress–strain responses. The initial microcracks are closed at hydrostatic stress of 2.6 MPa, and the uniaxial compressive strength is about 0.98 MPa. Under triaxial compression, there is a clear transition from volumetric compressibility to dilatancy and a strong dependency on confining pressure. Based on the experimental evidence, an elastoplastic model is proposed using a linear yield function and a nonassociated plastic potential. There is good agreement between numerical results and experimental data.
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Financial support from the Natural Science Foundation of China under grant no. 11172090, the state 973 project under grant no. 2011CB013504, and the Fundamental Research Funds for the Central Universities under grant no. 13CX02095A is gratefully acknowledged.
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Zhang, Y., Shao, J.F., Xu, W.Y. et al. Experimental and Numerical Investigations on Strength and Deformation Behavior of Cataclastic Sandstone. Rock Mech Rock Eng 48, 1083–1096 (2015). https://doi.org/10.1007/s00603-014-0623-8
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DOI: https://doi.org/10.1007/s00603-014-0623-8