Parametric analysis of Burgers model and creep properties of rock with particle flow code
Parametric analysis of Burgers model and creep properties of rock with particle flow code
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发表时间：
2015
影响因子：
1.5
通讯作者：
Yang Zhen-we
中科院分区：
文献类型：
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作者：
Yang Zhen-we
岩石作为地下工程的主要研究对象，由于其物质组成和复杂的地质环境，具有明显的流变特性。本研究将Burgers本构模型（由一系列Kelvin模型和Maxwell模型组成）应用于三维粒子流代码（PFC3D），分析了不同参数(弹性系数Em和Ek、粘度系数？M和？K和摩擦系数f)对瞬时和流变性能的影响。采用控制变量法。可以得出以下结论。瞬时强度特性主要受麦克斯韦弹性系数Em和摩擦系数f的影响，弹性模量和单轴抗压强度与Em和f呈正相关，泊松比与Em呈正相关，与f负相关，流变特性与这些参数呈负相关。在此基础上，对红页岩进行了阶段增量加载蠕变模拟试验。通过与室内试验结果的比较，证明了PFC3 D中Burgers本构模型在蠕变试验中的可行性。同时，将该方法应用于分阶段增量循环加卸载试验和三轴蠕变试验。本研究也是用离散元法分析岩石材料蠕变特性的一种新尝试。
As a main research object in underground engineering, rock has obvious rheological properties due to its material composition and complicated geological environment. Applying Burgers constitutive model(which is formed with a series of Kelvin model and Maxwell model) to particle flow code in three dimensions(PFC3D), this research analyzes the impact of different parameters(including elastic coefficients Em and Ek, viscosity coefficients ?m and ?k, and friction factor f) on the instantaneous and rheological properties. The controlling variable method is used. Conclusions can be drawn as follows. The instantaneous strength properties are mainly affected by Maxwell's elastic coefficient Em and friction factor f. The elastic modulus and uniaxial compression strength have positive correlation with Em and f. However, Poisson's ratio is positively correlated with Em and negatively correlated with f. Meanwhile negative correlations are observed among rheological properties and these parameters. Based on these conclusions, a staged increment loading creep experiment of red shale is simulated. Comparisons with results from laboratory experiments prove the feasibility of Burgers constitutive model in PFC3 D for creep experiments. At the same time, this method is used in staged increment cyclic loading and unloading experiment and triaxial creep experiment. This research is also a new attempt to analyze creep properties of rock material with discrete element method.