岩石含水蠕变损伤模型的开发与应用

摘要：为研究岩石含水率对蠕变的影响，将含水开关与蠕变损伤阀值引入蠕变模型，实现了含水劣化与蠕变损伤在本构关系上的耦合，建立了岩石含水蠕变损伤模型。模型与某软岩的三轴压缩蠕变试验结果取得了较好的拟合效果，并由麦夸特法+通用全局优化（LM-UGO）算法反演出了模型参数随岩石含水率的变化规律。在C++语言和FLAC3D中Fish语言的环境下，通过推导模型本构方程的三维差分形式，并利用FLAC3D所提供的接口实现了模型的二次开发。通过对开发的岩石含水蠕变损伤模型进行算例验证和分析，验证了模型的可靠性，也得出了软岩巷道蠕变变形随围岩含水率增大而增加的结论，进一步反映出蠕变模拟计算中考虑岩石含水率的必要性。

Secondary development and application of rock water-damage creep model based on FLAC3D

Abstract：In order to study the effect of water content on rock creep, the water switch and the creep damage threshold are introduced into a new creep model named rock water-damage creep model, through which the coupling of water deterioration and creep damage is realized on constitutive relation. The rock water-damage creep model has good imitative effect by comparison with the triaxial compression creep test results of a soft rock, and the variation laws of the model parameters with the water content are inversed by Levenberg-Marquardt (LM-UGO) algorithm. In the environment of C++ language and Fish language in FLAC3D, through deducing its constitutive equation in three-dimensional difference form, the rock water-damage creep model is secondarily developed by the interface of FLAC3D. After validating its accuracy by an engineering example, the rock water-damage creep model is used in numerical simulation to reflect that the roadway stability is gradually weakened with the increase of water content in surrounding soft rock.