含流体多孔介质中的快速传播断层(英文)  

Spreading Fault at High Speed in Fluid - Infiltrated Porous Material

作　　者：范天佑[1] 瀚赫格 

机构地区：[1]北京理工大学材料科学研究中心 [2]凯撒劳腾大学

出　　处：《北京理工大学学报》1990年第S1期122-132,共11页Transactions of Beijing Institute of Technology

基　　金：The project supported by the National Natural Scienoe Foundation of China;has been presented at the 17th Int .Cong. Theo .Appl.Mech .in Grenoble,France,Aug., 1988

摘　　要：用含流体多孔介质中Ⅱ型运动裂纹对剪切断层的快速传播作了系统分析,对断层不稳定性建立了判据,并对这一理论在地震学中应用的可能性作了探讨。Shear fault in a fluid - infiltrated elastic medium is modeled by a mode Ⅱ crack in fracture mechanics based on the model of PALMER , RICE and RICE , SIMONS . Following this model and considering the inertia effect caused by high - speed propagation of a shear fault. a dynamic analysis is given in this study . In the condition of high - speed propagation of the fault the boundary value problem can be simplified and easily solved . The critical shear stress (τ-τf) for judging the instability of the fault is determined . It contains the Poisson ratio v. of the unchained porous medium and V/c, and V/c2 , where V is the fault speed and c1 , e, are, respectively , the velocities of longitudinal and transverse waves corresponding to the drained elastic medium . (τ and τf represent the applied and frictional shear stresses , respectively ). The results show that the pore effect is significant in the dynamic case . At last some possible applications to seismology are discussed .

关 键 词：断层 多孔介质 动态断裂准则/高速传播 断层不稳定性 

分 类 号：N55[自然科学总论]