岩石动态剥落破裂的数值模拟

Numerical Simulation on Dynamic Rock Spalling

简单介绍了RFPA程序模拟岩石在动态载荷作用下破裂过程的原理和功能,并用该程序研究岩石在动态载荷作用下的剥落过程·数值模拟首先再现了均匀杆在不同的应力波幅值条件下表现出的不同剥落形式,通过与理论比较,证明了RFPA在模拟动态剥落破裂问题时的可行性·以此为基础,RFPA被用于模拟非均匀岩石试样在不同应力波幅值条件下的剥落破裂过程,预测了不同应力波幅值时试样的三个不同的破裂模式·此外,数值模拟还得出试样在动态载荷作用下的强度都高于静态强度的结论,这表明岩石材料力学性质的非均匀性是造成动态强度提高的原因之一·

The capability and principle of the software RFPA （rock failure process analysis） to simulate dynamic failure of rock are briefly summarized, and then RFPA is used to study the spalling of rock specimens under dynamic loadings. The capability of RFPA in simulating the dynamic rock spalling is validated by reproducing the different spalling characteristics of homogeneous bar under the stress waves with different amplitudees and by comparing it with theoretical and experimental results. Then, RFPA is used to simulate the spalling failure process of heterogeneous rock specimens subjected to stress waves with different amplitudes and three failure patterns are numerically predicted. In addition, the dynamic failure strengths of rock specimens under such stress waves are also numerically predicted and show higher values than the static tensile strength, which actually indicates that the heterogeneity is one of factors that lead to the increase in dynamic strength of rock.