岩层断裂的最大转动梯度准则及其在构造地质中的应用

认为微观转动不协调是产生断裂的原因。在现代有限变形力学Ｓ（应变）－Ｒ（转动）分解定理基础上提出了断裂扩展的最大转动梯度准则，可直接确定断裂产生的位置和扩展方向。初步应用该准则对雁行裂纹的形成过程进行了数值模拟。

MAXIMAL MICROROTATION GRADIENT CRITERION AND ITS APPLICATIONS IN TECTONIC GEOLOGY

The author realizes the important effect of microrotation on nucleation and growth of a crack,and points out that it is incompatible microrotation at the crack tip that causes cracking.With the concept of incompatibility of finite microrotation and on the basis of S(strain)-R(rotation) decomposition theorem in mechanics of finite deformation,a new criterion of fracture,the maximal microrotation gradient criterion,is proposed.With the new criterion, the direction of crack extension and the place where rupture will occur may easily be determined. At the end, a preliminary numerical simulation on the formation of a wild goose crack was completed by use of the criterion established.