变参数蠕变损伤本构模型及其工程应用

 考虑岩体的流变损伤劣化效应，建立一个变参数的蠕变损伤本构模型，该模型将岩体流变力学参数看作是非定常的，认为岩体流变参数随时间逐渐弱化，从而直观反映材料的损伤劣化过程。推导该蠕变损伤本构模型的三维差分表达式，并通过C++与FISH编程对有限差分软件FLAC3D进行二次开发，实现本构模型的程序化。将该模型应用于大岗山水电站坝基边坡工程，基于现场压缩蠕变试验，反演坝区岩体的蠕变损伤参数，通过坝区边坡开挖三维蠕变损伤稳定性计算，获得对边坡开挖设计和施工具有指导意义的建议和结论。

VARIABLE PARAMETERS-BASED CREEP DAMAGE CONSTITUTIVE MODEL AND ITS ENGINEERING APPLICATION

Considering effects of weakness of rock parameters，a creep damage constitutive model with variable parameters is proposed. In the model，the creep parameters of the rock are weakened with time gradually，so the deterioration process of the material can be reflected by unsteady creep parameters directly. The central difference equation in three-dimensional condition of creep damage constitutive model is deduced. The constitutive model is programmed by the secondary development of software FLAC3D using C++ and FISH. The model is applied in slope project of dam foundation at Dagangshan Hydropower Station. Based on the results of the compressive creep test，the creep damage parameters of rock mass in dam site are inversed. Reasonable evaluation and suggestions for the slope design and construction are provided though three-dimensional calculation of creep damage stability of the slope excavation at Dagangshan Hydropower Station.