【摘要】 为了对岩体工程的黏性流动变形进行预测,依据弹性问题位移分量的古萨(Goursat)表达式和弹-黏弹性比拟原理推导相对位移矢量增量公式,并建立变形预报模型,给出变形预报的方法步骤。该方法不是直接求出真实的时间、介质物性参数以及边界条件的值,而是求出一组组合值,通过相对位移矢量增量公式进行预测。无需复杂的应力边界和位移边界条件,能够考虑岩体介质的本构特征,实现长期的两维变形预报。然后将其应用到具有黏弹性解析解的边坡算例中,结果表明:短期预报的精度较高,误差小于10%,长期预报时误差约为23%。最后,结合边坡开挖讨论这一方法的工程适用性,为岩体工程黏性流动的长期两维变形预报提供理论基础和实用方法。更多还原

【Abstract】 Aimed at viscoelastic deformation prediction in rock engineering,an incremental formula of relative displacement is deduced based on Goursat expression of elastic displacement and elasticity-viscoelasticity analogy principle,and a deformation predicting model with methods and steps is proposed. It does not need the true values of time,boundary condition and physical property parameters of the rock mass,but obtains a group of combination values. The proposed method considering constitutive character of the rock mass can predict two-dimensional long-term deformation without stress and displacement boundary conditions. Then,it is applied to slope engineering,in which the comparison between predicted and measured deformation indicates that the method has high short-term prediction precision with error smaller than 10%,while the error is about 23% in the long-term prediction. At last,the engineering applicability of the method is discussed by an example of slope excavation which provides theoretical foundation and practical method for predicting two-dimensional long-term visco-elastic deformation of rock engineering.更多还原