论文部分内容阅读
当考虑无黏性土初始密实度及围压时,Pastor-Zienkiewicz本构模型需采用多组参数模拟同种材料,给其在实际中的应用带来了困难。针对原始Pastor-Zienkiewicz本构模型存在的这一问题,将新近发展的状态相关参数引入剪胀方程、塑性势方向矢量、加(卸)载方向矢量及塑性模量方程中,提高了模型在考虑初始密实度及初始围压时模拟无黏性土力学特性的能力;详细探讨了修正模型参数的拟定方法,明确了各参数的物理意义;通过试验资料对修正模型的预测能力进行了验证,预测结果与试验资料吻合良好,表明了修正模型的可行性和合理性。
Considering the initial compaction and confining pressure of non-cohesive soil, Pastor-Zienkiewicz constitutive model requires multiple sets of parameters to simulate the same material, which makes it difficult to apply it in practice. In order to solve this problem of the original Pastor-Zienkiewicz constitutive model, the newly developed state-related parameters are introduced into the dilatancy equation, the plastic potential direction vector, the loading direction vector and the plastic modulus equation, Initial compaction degree and initial confining pressure in simulating the dynamic properties of non-cohesive soil are discussed. The method of formulating the revised model parameters is discussed in detail, and the physical meaning of each parameter is clarified. The predictive ability of the revised model is verified through the test data. The result is in good agreement with the experimental data, indicating the feasibility and rationality of the revised model.