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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。
The viscoelastic Bolt-Kelvin (BK) anchoring model has high computational efficiency. However, due to the inability to describe the mechanical behavior of rock mass into the plastic phase, the application range of this rheological model is limited to some extent. Therefore, The Mohr-Coulomb (MC) yield criterion is modified to improve the BK anchoring rheology model. First, the finite difference incremental iterative computation format of the viscoelasto-plastic BK-MC anchoring model is deduced. Then, based on the UDM interface program in FLAC3D, the corresponding computational process is written in VC ++ language and loaded using Microsoft Visual Studio 2010 compiled DLL Finally, through uniaxial compression test, the BK-MC model was verified by numerical simulation and applied to the prediction and analysis of the surrounding rock stability of the deep laneway in the Zizhidong Mine. The results show that the evolution of the surface displacement of the roadway simulated by the simulation is more consistent with the regularity of the field measured results, further verifying the correctness and applicability of the new model. When studying the rheological problems of mining engineering, it is necessary to consider the mechanical behaviors of rock mass entering the plastic phase.