【摘要】 简单运用岩石破裂过程分析RFPA系统研究了均匀与非均匀岩石试样杆在不同波长冲击载荷作用下的剥落过程。数值模拟较好地再现了均匀岩石试样杆在不同应力波波长条件下的不同破坏模式,且数值模拟结果与解析理论结果具有较好的一致性。并在此基础上,进一步研究了非均匀性岩石试样杆在不同波长的冲击载荷作用下的剥落形式及其与均匀岩石试样杆破坏模式的差异。结论表明:RFPA程序能够较好地模拟均匀与非均匀杆在不同应力波波长作用下发生剥落破裂的过程;试件破坏模式不仅与断裂的强度有关,还与作用在试件上的持续时间有关;试件的破裂不仅与应力波的峰值以及波长有关,而且还与岩石的非均匀性密切相关。更多还原

【Abstract】 The principle of RFPA to simulate dynamic failure of rock was briefly summarized.RFPA was used to study the dynamic spalling process of homogenous and heterogeneous rock specimens under different wave lengths.The numerical simulation reproduced different failure modes of homogeneous rock under the compressive stress wave with different wave lengths,Numerical results agreed well with the theoretical ones,which proved that RFPA was effective in simulating the dynamic fracture of rock,then RFPA was used to simulate the spalling failure of heterogeneous rock bar subjected to stress waves with different wave lengths,and four failure patterns were numerically obtained.The different failure modes of the homogeneous and the heterogeneous rock specimens were also presented.These failure patterns were related with not only the strength of fragment but also the duration of load applied on the specimens.And the fractures of rock bars was not only connected with the magnitude and length of stress waves but also the heterogeneity.更多还原