两类雁列构造雁列区贯通过程中位移反向现象模拟  

NUMERICAL SIMULATION OF REVERSE DISPLACEMENT REGIONS DURING JOG FAILURE FOR TWO KINDS OF ECHELON FAULTS

作　　者：王学滨[1,2] 顾路[1] 马冰[1] 吕家庆 

机构地区：[1]辽宁工程技术大学力学与工程学院,阜新123000 [2]中国地震局地质研究所地震动力学国家重点实验室,北京100029

出　　处：《大地测量与地球动力学》2014年第2期45-50,共6页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金(51374122;51274109);高等学校博士点专项科研基金(20132121110006)

摘　　要：基于非均质应变软化模型,在拉张和挤压雁列构造雁列区贯通过程中,采用FLAC-3D模拟了一条断层内侧节点的水平位移的演变规律及标本全场内的水平、垂直位移反向区的分布规律。研究发现,两类雁列构造在雁列区贯通过程中都发生了位移反向现象,但位移反向区的面积与分布位置差别较大:拉张雁列构造的位移反向区面积大,且基本上都位于雁列区之外;挤压雁列构造位移反向区仅局限于雁列区及附近的断层上。Evolution of horizontal displacement of nodes at the internal side of a fault is modeled numerically by use of FLAC-3D,and distribution and evolution of regions where the sign of horizontal or vertical displacement of monitored nodes changes are also presented,based on the proposed heterogeneous and strain softening constitutive model. Result indicates that the reverse displacement phenomenon occurs during the jog failure for both echelon faults. However,the reverse displacement regions differ greatly for different echelon faults. For extensional echelon faults,the regions are large,and basically distribute outside the jog. For compressive echelon faults,the regions only locate in the jog and its adjacent faults.

关 键 词：雁列构造 位移反向 地震前兆 异常 前兆偏离 

分 类 号：P551[天文地球—构造地质学]