FRACTURE AND FLOW OF ROCKS UNDER HIGH TRIAXIAL COMPRESSION
FRACTURE AND FLOW OF ROCKS UNDER HIGH TRIAXIAL COMPRESSION
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DOI：
10.1029/jb076i005p01255
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发表时间：
1971-01-01
影响因子：
--
通讯作者：
MOGI, K
中科院分区：
文献类型：
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作者：
MOGI, K
一种新的三轴压缩技术使得研究岩石在三个主应力不同的一般三轴应力状态下的断裂和流动规律成为可能。利用该方法，对应力状态对岩石断裂屈服的影响进行了实验研究。岩石的断裂和流动特性不仅受到最小压缩σ3的显著影响，而且受到中间压缩σ2的显著影响。产生断裂和屈服的应力状态由以下公式确定：其中ƒ1and ƒ2are单调递增函数。与广义von Mises准则相对应的新破坏准则的物理解释为：当变形应变能达到随有效平均压力单调增加的临界值(σ1+ σ3)/2为断裂，(σ1+ σ2+ σ3)/3为屈服时，将发生断裂或屈服。塑性（断裂前永久应变）随σ3的增大而显著增大，随σ2的增大而减小。σ2和σ3对塑性的影响正好相反。根据这些结果，推导了应力状态对上地幔断裂和流动特性的影响。
A new triaxial compression technique has made possible the study of laws of the fracture and flow of rocks under general triaxial stress states, in which all three principal stresses are different. By this new method, the effects of the stress states on fracture and yielding of rocks were experimentally studied.Fracture and flow properties of rocks are markedly affected not only by the least compression σ3, but also by the intermediate compression σ2. The stress states that produce fracture and yielding are determined by the following formulas:where ƒ1and ƒ2are monotonic increasing functions. The new failure criteria, corresponding to the generalized von Mises criteria, are physically interpreted as follows: fracture or yielding will occur when the distortional strain energy reaches a critical value that increases monotonically with the effective mean pressure: (σ1+ σ3)/2 for fracture and (σ1+ σ2+ σ3)/3 for yielding. The ductility defined as the permanent strain just before fracture, markedly increases with the increasing σ3but decreases with increasing σ2. The influences of σ2and σ3on ductility are just the opposite. From these results on the effect of stress states, fracture and flow properties of the earth's upper mantle were deduced.