考虑物态变化的粗粒土亚塑性本构模型

建立了可描述粗粒土单调和循环力学特性的一个亚塑性本构模型.基于亚塑性理论的基本框架,引入临界状态参数,建立了一个新的粗粒土亚颦性模型,给出了数学公式及参数确定方法.采用该模型对粗粒上单调和循环加载试验进行了模拟和预测.该模型无需判断加卸载、参数较少、易于三维化,能够较全面地描述单调和循环荷载作用下粗粒土的主要力学特性,如强度与围压的非线性关系,胀缩规律与围压相关、卸载体缩、体变随加载过程累积等主要体变特性等.

A hypoplastic model of gravelly soil considering physical state

A hypoplastic model was investigated to describe the monotonic and cyclic behavior of gravelly soil. A new model was established through introducing the fundamental concepts of hypoplasticity theory and the critical state parameters. The formulae were derived; and their parameter determination method was also illustrated. The monotonic and cyclic stress-strain relationship response of a few gravels in practical projects were predicted and compared with the test results. The new model has few parameters, three-dimensional format and succinct formulae without loading criterion. The model is able to capture main monotonic and cyclic behaviors of gravelly soil, including the nonlinear relationship between the strength and confining pressure, the volumetric strain behavior dependent on confining pressure, contraction due to unloading and volumetric strain accumulation due to loading.