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Analysis on mechanical behavior and failure characteristics of layered cemented paste backfill(LCPB) under triaxial compression
Highlights The peak strength of LCPB increases with the increase of confining pressure and the decrease of the layer number. With the increase of the layer number in LCPB, the elastic modulus decreases, the cohesion increases, and the internal friction angle decrease. According to the difference of LCPB stress–strain curves, three constitutive models were constructed. The energy and damage changes of LCPB have obvious confining pressure effect and layer effect.
Abstract To explore the mechanical properties and energy evolution law of layered cemented paste backfill (LCPB), LCPB specimens layer numbers of 1, 2, 3 and 4 were made, and triaxial compression tests with confining pressures of 0, 0.2, 0.5 and 0.8 MPa were carried out. Combined with the principle of energy evolution, the damage and failure law of LCPB were analyzed in depth. The results show that: The failure type of LCPB is mainly a tensile failure, and the failure plane mainly appears in the later layers. Relative to the failure deformation, the elastic energy increases first and then decreases, and the elastic energy reaches its maximum at the peak stress point. The peak strength increases linearly with the increase of confining pressure and decreases linearly with the increase of layer number. The peak strain increases exponentially with the increase of confining pressure and layer number. The elastic modulus increases exponentially with the increase of confining pressure and decreases logarithmically with the increase of layer number. According to the different deformation types of LCPB, three failure constitutive models of plastic-elastic–plastic type, elastic–plastic type and elastic–plastic-viscous type were built respectively, and the accuracy of the models was verified by the coincidence degree with the test curves. The ultimate elastic energy, failure dissipated energy and failure constitutive energy all show obvious confining pressure effect and layer effect, and the damage value at the peak point decreases first and then increases with the increase of confining pressure.
Analysis on mechanical behavior and failure characteristics of layered cemented paste backfill(LCPB) under triaxial compression
Highlights The peak strength of LCPB increases with the increase of confining pressure and the decrease of the layer number. With the increase of the layer number in LCPB, the elastic modulus decreases, the cohesion increases, and the internal friction angle decrease. According to the difference of LCPB stress–strain curves, three constitutive models were constructed. The energy and damage changes of LCPB have obvious confining pressure effect and layer effect.
Abstract To explore the mechanical properties and energy evolution law of layered cemented paste backfill (LCPB), LCPB specimens layer numbers of 1, 2, 3 and 4 were made, and triaxial compression tests with confining pressures of 0, 0.2, 0.5 and 0.8 MPa were carried out. Combined with the principle of energy evolution, the damage and failure law of LCPB were analyzed in depth. The results show that: The failure type of LCPB is mainly a tensile failure, and the failure plane mainly appears in the later layers. Relative to the failure deformation, the elastic energy increases first and then decreases, and the elastic energy reaches its maximum at the peak stress point. The peak strength increases linearly with the increase of confining pressure and decreases linearly with the increase of layer number. The peak strain increases exponentially with the increase of confining pressure and layer number. The elastic modulus increases exponentially with the increase of confining pressure and decreases logarithmically with the increase of layer number. According to the different deformation types of LCPB, three failure constitutive models of plastic-elastic–plastic type, elastic–plastic type and elastic–plastic-viscous type were built respectively, and the accuracy of the models was verified by the coincidence degree with the test curves. The ultimate elastic energy, failure dissipated energy and failure constitutive energy all show obvious confining pressure effect and layer effect, and the damage value at the peak point decreases first and then increases with the increase of confining pressure.
Analysis on mechanical behavior and failure characteristics of layered cemented paste backfill(LCPB) under triaxial compression
Zhang, Chao (Autor:in) / Fu, Jianxin (Autor:in) / Song, Weidong (Autor:in) / Kang, Mingchao (Autor:in) / Li, Teng (Autor:in) / Wang, Naiwei (Autor:in)
24.01.2022
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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