CAJ | 학술논문

本文利用新的有限元方法研究了铲状正断层带在非均匀应力场下错动引起的位移场和应力场.研究发现:①铲状正断层错动引起的断层面上的最大错距不是发生在地表,而是发生地表下面断层的中部;②地表面最大水平位移和垂直佗移都不是发生在地表断层上,而是发生在偏离断层一定距离的地方;③铲状正断层错动会在地表附近产生两个破裂区,一个在地表断层附近,一个在远离断层的上盘地表附近,这两个区与野外观测到的次生正断层区一致;④断层错动的应力降在断层内不是均匀的,最大值也是位于断层中部.
본문이용신적유한원방법연구료산상정단층대재비균균응력장하착동인기적위이장화응력장.연구발현:①산상정단층착동인기적단층면상적최대착거불시발생재지표,이시발생지표하면단층적중부;②지표면최대수평위이화수직타이도불시발생재지표단층상,이시발생재편리단층일정거리적지방;③산상정단층착동회재지표부근산생량개파렬구,일개재지표단층부근,일개재원리단층적상반지표부근,저량개구여야외관측도적차생정단층구일치;④단층착동적응력강재단층내불시균균적,최대치야시위우단층중부.
A new finite element method (FEM) in consideration of inhomogeneous stress field is introduced to study the dislocation of a listric normal fault zone's displacement and stress fields. New results reveal: (1) the site of maximum slip is at the middle part of the fault, not near the surface. (2) the maximum horizontal and vertical displacements at the ground surface are located at some distance from the fault trace. (3) slip of the fault may result in two failure regions near the ground surface: one close to the surface trace of the fault, and the other within the hanging wall at some distance from the fault; it is in the regions that a succession of normal faults is typically observed in geological examples. 4) The maximum shear stress drop of the fault is also at its middle part.