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Three-dimensional deformation and failure mechanism of surrounding rock ground induced by strike slip fault displacement

走滑断层位移诱发围岩地面三维变形破坏机制

基本信息

批准号：
16360241
负责人：
KANATANI Mamoru
金额：
$ 6.98万
依托单位：
Central Research Institute of Electric Power Industry
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

项目摘要

The following results were obtained through research activities from 2004 to 2006.1. Field surveys of strike-slip fault systemsField surveys at the Miura Peninsula revealed that the strike-slip fault systems in rock mass consist of Riedel shears and P-shears forming flower structures.2. Fault model test under confining pressure using natural rock in an stiff loading machineLoading tests on rock plates made from Kawazu tuff showed that the surface fracture zones of the plates consist of Riedel shear, P shear and whitened crashed zone. The size of the fracture zone becomes large as the fault displacement increases, though the extension of the fracture zone is constricted under high confining pressure.3. Analogue Experiments of strike-slip fault systemsStrike-slip fault zones are induced experimentally in artificial rock subjected to strike-slip displacement along basement fault. The purpose is to investigate in three dimensions, the geometries and sequence of development of structural elements comprising the fault zones by use of an X-ray CT scanner. The deformation of the artificial rocks under increasing basement displacement was observed as follows.1) En echelon fractures corresponding to the Riedel shears and P-shears are observed at the surface of the artificial rock. 2) New shears (outer shear) initiate from the points of interconnection of Riedel and P-shears, and propagate aside from the fault zone that consists of Riedel and P-shears. In vertical cross section, these shears diverge from the basement fault (flower structure) or branch near the top surface of the artificial rock (`Y' shape structure).4. Unified recognitions on deformation and failure mechanism of rock ground induced by strike-slip faultThrough the above-mentioned field survey and two-types of the fault model tests, an unified recognition were obtained on the deformation and failure mechanism at the ground surface and at the cross section of the rock ground induced by the strike-slip fault.

2004 - 2006年的研究结果如下：走滑断裂系统的野外调查三浦半岛的野外调查显示，岩体中的走滑断裂系统由Riedel剪切和p剪切组成，形成花状构造。对川初凝灰岩岩板进行的加载试验表明，川初凝灰岩板的表面破碎带主要为里德尔剪切、P剪切和白化破碎带。断裂带的大小随着断层位移的增大而增大，但在高围压作用下，断裂带的扩展受到限制。沿基底断层进行走滑位移，在人造岩石上进行了走滑断裂带模拟实验。目的是利用x射线CT扫描仪在三维空间中研究包括断裂带在内的构造元素的几何形状和发育顺序。在基底位移增大的情况下，人造岩石的变形观察如下：1)在人工岩石表面观察到与里德尔剪切和p剪切相对应的恩梯队裂缝。2)新剪切（外剪切）从里德尔剪切和p -剪切的连接点开始，向里德尔剪切和p -剪切组成的断裂带外传播。在垂直剖面上，这些剪切体从基底断层（花状构造）或靠近人造岩石顶面（“Y”形构造）的分支中发散出来。统一认识走滑断层诱发岩体变形破坏机制通过上述野外调查和两类断层模型试验，对走滑断层诱发岩体地表和截面变形破坏机制取得了统一认识。