正断层与逆断层错动引起的上覆黏土变形特性离心试验
发布时间：2018-09-06 15:04
【摘要】：采用土工离心机试验,研究正断层和逆断层错动引起上覆饱和黏土层在20步连续断层错动作用下的变形特性以及裂缝扩展的规律。研究结果显示,正断层错动后地表呈现多条且平行断层面的张拉裂缝,随着错动量的增大,正断层破裂逐渐偏离基岩断层的错动方向,偏向上盘一侧,裂缝逐渐向上盘的方向开裂,裂缝主要发生在断层延长线附近;逆断层错动后地表裂缝均分布在上盘,而且离断层尖端延长线较远,产生的裂缝较细、数量较少,随着断层错动量的增大,地表位移增大,靠近断层下盘一侧的地表受断层错动影响较小,位于断层上盘一侧的地表则随着断层错动显著移动;随着断层错动量的增大,最大地表坡度随之增大,正断层引起的最大坡度的位置逐渐向上盘方向移动,逆断层引起的最大坡度的位置逐渐向下盘方向移动,逆断层的影响范围比正断层的影响范围更广。
[Abstract]:By means of geotechnical centrifuge test, the deformation characteristics of the overlying saturated clay layer caused by the dislocation of normal fault and reverse fault and the law of crack propagation under the misoperation of 20-step continuous fault are studied. The results show that there are many tensile fractures on the surface of normal fault after fault dislocation and parallel fault plane. With the increase of fault momentum, normal fault rupture gradually deviates from the direction of dislocation of bedrock fault and deviates to one side of the upper side. The cracks gradually crack in the direction of the upper face, the cracks mainly occur near the extension line of the fault, the surface cracks are distributed in the upper face after the reverse fault is staggered, and they are far away from the extension line at the tip of the fault, resulting in a smaller number of cracks. With the increase of fault momentum, the surface displacement increases, the surface near the bottom of the fault is less affected by fault dislocation, the surface located on the upper side of the fault moves significantly with fault dislocation, and with the increase of fault momentum, The position of the maximum slope caused by normal fault gradually moves to the upper disk, and the position of the maximum slope caused by reverse fault moves down gradually. The influence range of reverse fault is wider than that of normal fault.
【作者单位】： 东京大学土木工程系;中国科学院成都山地灾害与环境研究所山地灾害与地表过程重点实验室;
【基金】：国家自然科学基金项目(No.41301009)~~
【分类号】：TU41
本文编号：2226718
[Abstract]:By means of geotechnical centrifuge test, the deformation characteristics of the overlying saturated clay layer caused by the dislocation of normal fault and reverse fault and the law of crack propagation under the misoperation of 20-step continuous fault are studied. The results show that there are many tensile fractures on the surface of normal fault after fault dislocation and parallel fault plane. With the increase of fault momentum, normal fault rupture gradually deviates from the direction of dislocation of bedrock fault and deviates to one side of the upper side. The cracks gradually crack in the direction of the upper face, the cracks mainly occur near the extension line of the fault, the surface cracks are distributed in the upper face after the reverse fault is staggered, and they are far away from the extension line at the tip of the fault, resulting in a smaller number of cracks. With the increase of fault momentum, the surface displacement increases, the surface near the bottom of the fault is less affected by fault dislocation, the surface located on the upper side of the fault moves significantly with fault dislocation, and with the increase of fault momentum, The position of the maximum slope caused by normal fault gradually moves to the upper disk, and the position of the maximum slope caused by reverse fault moves down gradually. The influence range of reverse fault is wider than that of normal fault.
【作者单位】： 东京大学土木工程系;中国科学院成都山地灾害与环境研究所山地灾害与地表过程重点实验室;
【基金】：国家自然科学基金项目(No.41301009)~~
【分类号】：TU41
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