地下洞室群的弹粘塑性有限元分析

针对岩石类介质，基于Perzyna的弹粘塑性理论，采用弹粘塑性本构模型，建立了相应的有限元列式，并从理论和经验两方面讨论了迭代过程中时间步长的限制问题。对某洞室围岩稳定性所进行的分析，考虑了洞室开挖过程中的粘性效应，得到了洞周围岩的位移，应务随时间变化的规律，为地下洞室施工的适时支护提供了依据。

Elasto-Viscoplastic FEM Analysis for Underground Chambers

Based on Perzyna's Elasto-Viscoplastic theory, the constitutive laws of elasto-viscoplastic models are used and the corresponding FEM formulae are developed for analysis of rock medium. The restriction on time-step length during the iterative process is discussed from theoretical and empirical points. The stability analysis for surrounding rock of a chamber is taken as an example, in which the viscosity effect during chamber excavation is taken into account. The regularities of the displacement and stress of surrounding rock varying with time are obtained, providing a basis for timely supporting on underground chamber construction.