Development of the high performance mechanical tests method of rock materials by means of X-ray CT

为发展岩石材料的高性能X射线CT力学测试方法，主要开展了以下研究工作：在岩石孔隙中液固两相流动可视化与定量方法的发展课题中，通过一系列高密度碳酸钙溶液渗入岩石的渗透试验，解决了液固两相流动相关问题的广泛性和技术性。在剪切断裂面位移场的可视化与评价中，利用试件中较大颗粒的特殊性质确定了剪切断裂面的位置，研究了剪切变形与剪胀之间的定量关系。在裂纹投影法高精度测量裂纹几何形状的课题中，应用裂纹投影法测量了材料中裂纹尖端的几何形状，并进行了基于断裂力学的分析。在示踪剂辅助渗透法测定渗透速度这一课题中，通过对多孔砂岩进行X-射线CT示踪剂辅助渗透试验，验证了试验的稳定性和重复性。在利用颗粒CT值分布特征进行高精度颗粒结构分析这一课题中，充分利用球形油炸灰运移对颗粒结构分析方法的应用，验证了该方法的理论基础。这些研究成果也被应用于实验室的各种模型实验，为地球科学技术研究提供了大量的信息和微小的海量数据。

In order to develop the high performance mechanical tests method of rock materials by means of X-ray CT, mainly following research topics have been studied. In the topic of development of visualization and quantification method of liquid-solid two phase flow in rock pore, the wide range and technical of problems related the liquid-solid two phase flow have been solved through a series of permeation tests of high density calcium carbonate solution into the porous stone. In the topic of visualization and evaluation of displacement field of the shear fracture surfaces, the location of the shear surfaces is specified by the special characteristics of relatively large grain in the sample, then the quantitative relation between shear deformation and dilatancy have been investigated. In the topic of the high accuracy measurement of crack geometry by crack projection method, geometry of crack tip shape developed in the materials have been measured by applying crack projection method, and the analyses based on the fracture mechanics have been conducted. In the topic of the measurement of permeation velocity by tracer-aided permeation method, the stability and repeatability of the tests have been confirmed by applying X-ray CT tracer-aided permeation tests to the porous sand stone. In the topic of the high accuracy analysis of grain structure by the characteristic of CT value distribution, the theory of the method have been confirmed by applying the structural analysis method of the grain utilizing the movement of spherical fry ash in the ample. These results of the present study were also applied to various model experiments in laboratory, presenting significant information and minute huge data of indispensable to the researches in geo-science and technology.