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堆石料等粗粒土在经受剪切时不仅其强度和刚度随应力水平而变化,其体积变化特征也和应力水平密切相关。在Mohr-Coulomb模型的基础上,提出一个针对这类粗粒土剪切特征的应变硬化模型。模型以Mohr-Coulomb准则作为屈服准则,但考虑土体强度、刚度和体积变化特征均随应力水平而变化等重要特性。对Rowe剪胀理论的推导及其试验基础进行了深入讨论,指出该理论对于粗粒土的局限性,并在此基础上针对粗粒土的剪胀特性进一步发展给出其机动剪胀角的变化规律。与试验结果的计算对比表明,该模型能较为全面地反映粗粒土的主要剪切特性,特别是剪切时的体积变化特性,且相对简便实用。
The coarse grained soil, such as rockfill, not only changes its strength and stiffness with the stress level when subjected to shear, but also its volume change characteristics are closely related to the stress level. Based on the Mohr-Coulomb model, a strain hardening model for the shear characteristics of such coarse grained soil is proposed. The model takes the Mohr-Coulomb criterion as the yield criterion, but takes into account the important characteristics such as the change of the strength, stiffness and volume change characteristics of the soil body with the stress level. The derivation of Rowe dilatancy theory and its experimental basis are discussed in depth. The limitations of this theory for coarse grained soil are pointed out. Based on this, the dilatancy characteristics of coarse grained soil are further developed and its maneuver dilatancy angle The law of change. Comparisons with the experimental results show that the model can reflect the main shear properties of coarse grained soil more completely, especially the volume change characteristics during shearing, and is relatively simple and practical.