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defgf24uw
Wysłany: Pon 6:14, 20 Gru 2010
Temat postu: Moncler prezzi Calcareous sand particle breakage a
Calcareous sand particle breakage and dilatancy effect of confining pressure
Reduction of stress. Strain there is a clear difference between the reason is in its special physical properties. Material composition of calcareous sand particles of calcium carbonate for the lower strength, and the particle shape is irregular,
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, it also produced at lower confining pressure, particle breakage phenomenon. Loaded in the confining pressure is very low, very few broken particles of calcareous sand, soil deformation by dislocation slip relative particle-based, and ordinary soil dilatancy little difference: With the increase of confining pressure,
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, particle breakage gradually increased, caused by a broken shear deformation of a corresponding increase in shrinkage, while still not broken particles to slip deformation, dilatancy is just getting smaller and smaller, the result of coupling between the two is the hardening reaction of calcareous sand increased axial strain corresponding to peak stress of soil is much greater than ordinary stress. Payable to the hardening transition relations. As the ultimate friction angle of calcareous sand with little to confining pressure,
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, namely, the critical state of the soil surface the same, therefore, Figure 5 (a) stress. Strain curve similar to the critical stress ratio / cr3 value approach, and then plastic deformation. 5 Conclusion calcareous sand of the stress. And general land-strain relationship of sand varies widely,
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, with the common elastic-plastic constitutive soil difficult to describe because the calcareous soil in the deformation process is accompanied by particle breakage. This article will calcareous sand particle breakage and slippage of the two deformation mechanisms at the same time,
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, and bounding surface model with damage to be expressed, analysis of particle breakage and dilatancy relationship with the confining pressure, theoretical results are consistent with the experimental results . The specific biological causes of calcareous sand and particles, calcareous sand and micro-deformation mechanism of particle breakage on the deformation mechanism and strength characteristics of such urgent need of further study.
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