黏弹塑性BK-MC锚固模型二次开发及工程应用

黏弹性Bolt-Kelvin（简称B-K）锚固模型具有较高的计算效率，但由于无法描述岩体进入塑性阶段的力学行为特性，使得该流变模型的采矿工程应用范围受到一定的限制，为此引入修正Mohr-Coulomb（简称M-C）屈服准则对B-K锚固流变模型进行改进。首先推导了黏弹塑性BK-MC锚固模型的有限差分增量迭代计算格式；然后基于FLAC3D中UDM接口程序，采用VC++语言编写了相应的计算流程，使用Microsoft Visual Studio 2010编译态链接库DLL进行加载和调用；最后通过单轴压缩试验对开发BK-MC模型进行了数值模拟验证，并应用于口孜东矿深部巷道围岩稳定性预测分析中。结果表明，模拟计算得到的巷道表面位移演化过程与现场实测结果的规律性更趋于一致，进一步验证了新模型的正确性和适用性。研究采矿工程的流变问题时，考虑岩体进入塑性阶段的力学行为特性十分必要。

Secondary development and engineering application of viscoelasto-plastic BK-MC anchorage model

The viscoelastic B-K anchorage model can be computed efficiently. However, this rheological model is limited in application of mining engineering because it cannot well describe the mechanical characteristics of rock mass into plastic stage. In order to improve the Bolt-Kewin (B-K) model, a new viscoelasto-plastic anchorage model called BK-MC was proposed by introducing a modified Mohr-Coulomb (M-C) yield criterion. The increment iterative calculation scheme of BK-MC model was deduced in finite differential method first. Then, based on UDM interface program of FLAC3D, the corresponding calculation process was compiled by the VC++ programming language and called by DLL of Microsoft Visual Studio 2010. Finally, the BK-MC model was verified by the numerical simulation of uniaxial compressive test and applied to the stability analysis of deep roadway’s surrounding rock in Kouzidong mining area. The results show that the simulation displacement evolution process of roadway surface tends to be uniform with the regularity of field test data, which further verifies the validity and applicability of the BK-MC model. And it is necessary to consider mechanical properties of rock into plastic stage when studying the rheological problems of mining engineering.