改进超固结状态参量次加载面模型数值实现与应用

为合理描述超固结土复杂的弹塑性力学行为,对现有Hashiguchi次加载面模型中的超固结状态参量R进行修正,在硬化方程中,考虑塑性体应变与塑性剪应变的综合作用,提出了修正超固结状态参量的次加载面模型。同时,着重介绍了该模型的隐式积分算法及数值实现过程,编制了对应的接口子程序,实现了该模型在有限元软件ABAQUS中的应用。通过不同工况和加载方式下的数值模拟验证了程序的合理性,最后应用模型研究了Fujinomori黏土的三轴压缩力学特性并与UH模型的模拟结果、室内试验研究进行对比。结果表明,子程序具有较高的计算精度和可靠性,模型能够准确地模拟黏土的超固结特性。

Numerical implementation and applications on subloading surface model with improved overconsolidation state variable

To describe the complex behavior of overconsolidated soil ,an improved overconsolidation state variable subloading surface model was presented .The multiple impact of plastic volumetric and shear strain on overconsolidation state variable R was considered in hardening equation .The stress‐update algorithm and the procedure of numerical implementation were introduced .The the model was applied by compiling the interface subroutine in finite element software ABAQUS .The rationality of the subroutine was verified by numerical simulations in different working conditions and load types . At last ,Fujinomori Clay was simulated by the model in compression test ,and the results were compared with those of U H model and experimentation data . The subroutine was precise and steady andthe model proposed can describe the properties of overconsolidation accurately .