脆性断层形成的递进连通模型

PROGRESSIVE COALESCENCE MODEL OF BRITTLE FAULT FORMATION

发育于地壳浅层中的脆性断层常常由一系列次级小断层所构成。在结合岩石力学试验中“微”观特征和地质学野外观测“宏”观现象的基础上，建立了脆性断层形成由微裂纹→缝合线状裂缝→宏观断层→超大断裂的递进连通模型，并分析了裂缝递进连通的机制，解释了模型中断裂呈波状弯曲、连接分支及断裂逐渐与最大主应力夹角变小的现象。

In lower crust, faults often consist of a series of secondary fractures. Based on experimental microfeatures in rock mechanics and macrostructures in fields, authors set up the progressive coalescence model which is from microcrack,stylolitic fracture, large fault to superlarge fault in fault formation, analyse the forming mechanism of progressive coalescence model, and explain three phenomenon, respectively, the undulation,branch of fault and that the angle between fractures and principal axis decreases gradually.