Experimental study on deformation and failure characteristic of complex jointed rock mass based on sand-powder 3D printing
The deformation and failure characteristics of complex jointed rock mass has important theoretical and practical significance for the stability control of rock engineering.In order to overcome the difficulties of casting method in generating rock-like specimens with complex joints,and to investigate the effect of joint density on the deformation and failure characteristics of rock mass,sand-powder 3D printing is employed to generate rock-like specimens with complex joints based on Monte-Carlo method.By conducting uniaxial compression test with digital image correlation(DIC),the effect of joint density on the mechanical behaviors,fracturing evolutions and failure patterns of rock mass has been investigated.The results show that:with the increase of the joint density,the peak strength and peak strain decrease exponentially,and the elastic modulus decreases linearly.Meanwhile,the pre-peak energy,elastic strain energy,dissipative energy and post-peak surplus energy decrease exponentially,while the post-peak release energy decreases linearly.Both the location and dip angle of joints affect the initiation and propagation of cracks;with the increase of joint density,the initiated cracks are more tend to propagate along a specific path,and the control effect of joint on crack propagation becomes more significant.The results provide a new method for the experimental test of complex jointed rock mass,and provide theoretical reference for the deformation failure mechanism and stability analysis of complex jointed rock mass.
rock mechanicssand-powder 3D printingcomplex jointed rock massjoint densitymechanical behaviorfailure characteristic
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