论文部分内容阅读
在修正剑桥模型基础上,本文建立的剪胀性饱和砂土弹塑性模型使用相变状态参数描述剪胀性饱和砂土剪胀特性,克服了修正剑桥模型不能直接模拟剪胀砂土力学行为这一局限性。该模型有两方面的改进:一方面,模型将剪胀应力比Md引入剪胀方程;另一方面,模型在塑性功基础上提出用与应力路径无关的硬化参数来替代修正剑桥模型中的塑性体积应变增量。通过试验验证及与修正剑桥模型计算结果对比,结果表明,该模型较适合模拟剪胀性饱和砂土的力学性能,同时也能较好地体现较密实砂土的硬化及软化现象。模型共8个参数,用常规三轴试验就可获取。
Based on the modified Cambridge model, the dilatancy model of saturated soils, which is established in this paper, is used to describe the dilatancy characteristics of dilatational saturated sand using the phase transition state parameters. This overcomes the fact that the modified Cambridge model can not directly simulate the mechanical behavior of dilatable sand A limitation. On the one hand, the model introduces the dilatancy ratio of the dilatancy ratio Md into the dilatancy equation; on the other hand, based on the plastic work, the model proposes to use the hardening parameter irrelevant to the stress path to replace the plasticity in the modified Cambridge model Volumetric strain increment. The experimental results show that the model is more suitable for simulating the mechanical properties of dilatancy saturated sand, and can also better reflect the hardening and softening of compacted sand. A total of eight parameters of the model, with conventional triaxial test can be obtained.