岩石单一裂纹扩展率的数值模拟研究
摘要
运用断裂力学理论推导出单一裂纹有效长度理论表达式,提出裂纹扩展能力的度量单位———裂纹扩展率的概念。通过FLAC3D有限元软件模拟计算了岩石单一裂纹在不同压应力作用下的裂纹扩展率,通过比较裂纹扩展率的理论值和数值实验值,发现在不同压应力作用下两者基本吻合,指出数值实验是计算单一裂纹扩展长度的有效方式之一。
The expression of single crack's effective length was deduced with the fracture mechanics theory and the concept of crack expansion rate - the measurement unit of single crack expansion ability was proposed. The expansion rate of single rock c rack under different compressive stresses was calculated by numerical experiment of the finite element software FLAC3D.It was found from the contrast of the theoretical value with the experimemtal value of the crack expansion rate that two values were basically concordance under different compressive stresses, so the numerical experiment was one of the effective methods for the calculation of the single crack's expansion length.
The expression of single crack's effective length was deduced with the fracture mechanics theory and the concept of crack expansion rate - the measurement unit of single crack expansion ability was proposed. The expansion rate of single rock c rack under different compressive stresses was calculated by numerical experiment of the finite element software FLAC3D.It was found from the contrast of the theoretical value with the experimemtal value of the crack expansion rate that two values were basically concordance under different compressive stresses, so the numerical experiment was one of the effective methods for the calculation of the single crack's expansion length.
引文
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[2]朱万成,唐春安.岩板中混合裂纹扩展过程的数值模拟[J].岩土工程学报,2000,22(2):231-234.
[3]陈卫忠,李术才,朱维申.岩石裂纹扩展的实验与数值分析研究[J].岩石力学与工程学报,2003,22(1):18-23.
[4]李庆芬,等.断裂力学及其工程应用[M].哈尔滨:哈尔滨工程大学出版社,2004.
[5]傅真,蔡永恩.岩石试件尺寸对裂纹应力场影响的数值分析[J].地震学报,2005(3).
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