Initiation of fracture occurs when principal strain magnitudes reach critical values. , Liang, P. Effect of thermal Damage on Mechanical Behavior of a fine-grained sandstone. At high confining pressure, only elastoplastic behaviour is observed. , and He, T. In this region, the cementation continuously degrades until it is completely broken at large strains.
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(2015). , Peng, K. Current Status and Development of Comprehensive Utilization of Waste Rock in Metal Mines in China. For example, Talesnick et al. Thus, the reduced rate of dilation appears to be associated with the occurrence of the shear band and the achievement of critical state conditions within the shear plane.
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With the increase of waste rock content, the permeability of the sample gradually increased. Rock Mech. The use of solid waste generated in the mining process to fill the goaf can effectively control the deformation and damage of the surrounding rock in the goaf, and prevent the surface subsidence, which can not only ensure the safety of stope but also make full use of the solid waste of mines. , 2021c). HQ: methodology, conceptualization, supervision, writingoriginal draft. Figure 26 shows the conceptual variation of compressive and tensile strength as a function of void ratio and cementation, based on findings by Huang and Airey (1998) and Consoli et al.
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To explore the changes of pore structure in the backfill body of this test, the microstructure was observed by scanning electron microscopy. Characteristic states occur at the transition from contraction to dilation, and these states are located on a straight line, the characteristic line, through the stress origin. B. Figure 16 summarises their findings schematically. Figure 27 shows the effect of confining pressure on the results of drained triaxial compression tests on the soil-cement. I.
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When the cementsand ratio was 1:4, the cement content in the backfill body was sufficient, and the larger waste rock particles can be fully wrapped. doi:10. R. , 2013; Hong et al. Tests by Lade and Overton original site indicated that the strength at high confining pressures of a material with lower degree of cementation could surpass the strength of the same material but with higher degree of cementation. The elastic modulus in tension and compression has been found to be similar.
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, Jiang, D. The waste rock particles continue to increase due to the increase of large particle aggregates; cement cannot fully cover all waste i thought about this particles because after solidification, there were more primary pores, thus forming a low strength area. Figure 7 Stress–strain relation and void ratio change from triaxial compression test exhibiting strain-softening and development of shear planeExperimental results with respect to the formation of shear bands under various stress conditions are available from previous investigations (e. Lade and Overton (1989) studied the effect of cementation and confining pressure in triaxial compression tests on granular material with the same grain size curve, the same water/cement ratio, and the same density.
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(2019). As the waste rock content continues to increase, the tailings particles and cementing materials between waste rock particles become less and less, and the pores formed between waste rock particles became more and more, and the permeability of backfill body became more and more. Instant access to the full article PDF. The stress–strain curve in the uniaxial compression test indicates that yielding and failure coincide, and softening follows immediately after failure. Permeability fluctuation curve: (A) different waste rock contents; (B) different cementsand ratios. The research presented here was performed with support from the American Chemical Society Petroleum Research Fund under grant no.
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315, 125278. Dilation plays an important role in the formation of shear bands. When the cementsand ratio was constant, adding a small amount of waste stone particles with large particle size can reduce the specific surface area of aggregate. J. When the cementsand ratio was 1:8, the further reduction of the cementitious material makes the granular tailings of the backfill body unable to be wrapped by the cementitious material in the curing process.
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, 2014; Lu et al. It should be noted that the effective cohesion created by the cementation and the shear strength generated by the friction and the confining pressure are not mobilised at the same time. .