二维粘弹性问题反分析计算的统一模型

本文就地下工程中二维平面应变问题提出了反演确定洞室围岩初始地应力及其粘弹性参数的统一方法,用五种常见的描述岩土体变形性态的粘弹性模型的参数作反演计算.文中在描述岩土体材料的粘弹性性态的本构方程用统一公式表示,通过论证提出了依据现场量测信息对初始地应力和围岩粘弹性参数进行反演计算的原理、方法和公式,包括可据以进行线弹性反演计算的数值法方程,以及可用于确定围岩粘弹性参数的反演计算方程等.此外,文末还通过算例验证对所提方法的适用性进行了论证.

A General Method for Back Analysis of 2-D Viscoelastic Plane Strain Problems

In this paper a general method for back analysis of two dimensional viscoelastic plane strain problems is established, which can be used in practice to calculate IES (Initial Earth Stresses) and viscoelastic parameters for surrounding rock of a cavity, including those indicating time-dependent behaviour of rock mass for any common viscoelastic models. The constitutive laws of five viscoelastic models are expressed in the same formula after equivalent Young's Modulus has been introduced to represent the composite influence of material behaviour parameters. Then corresponding to data measured in situ, a series of equations for back analysis calculation has been established, including those for determing parameters in viscoelastic models. An example is described at the end of the paper to verify the method.