渗流状态下砂岩的三维实时CT观测  

TRIAXIAL REAL-TIME OBSERVATIONS OF SANDSTONE UNDER SEEPAGE BY X-RAY CT SCAN

作　　者：崔中兴[1,2] 仵彦卿[1,2] 蒲毅彬[3] 林峰 张飞跃[1] 冯小太[3] 

机构地区：[1]西安理工大学 [2]中国科学院寒区旱区环境与工程研究所,甘肃兰州730000 [3]中国科学院寒区旱区环境与工程研究所 [4]西安煤航遥感应用研究院

出　　处：《岩石力学与工程学报》2005年第8期1390-1395,共6页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(10172071);陕西省教育厅专项(00JK218)

摘　　要：利用中低压多功能CT专用渗流实验装置,进行了三维应力状态下砂岩的渗流实时CT观测试验研究。为使试验具有对比性,分别进行干燥试样的常规三轴试验和渗流三轴试验的CT实时观测,取得了渗流对岩石损伤演化规律影响的初步成果。根据试验过程的应力–应变曲线,提出试样强度和变形折减率的计算公式;分析了干燥试样和渗透试样CT数与应力的相关关系;提出了确定裂缝宽度的像素量测法;提出根据测区平均CT数与测区面积的相关关系来确定裂缝宽度的数值计算方法。By using the mid-low-pressure multi-function CT special seepage experiment equipment, the experimental study on real-time CT observation of sandstone under seepage and 3D stress is carried out. Considering the comparability of test results, the normal triaxial tests on dry specimens and triaxial tests on seepage specimens are observed by X-ray CT scan in real-time, respectively, and the initial results that the seepage affects the sandstone damage evolution are obtained. In accordance with the stress and strain curves, the strength calculation formulas of test specimens and deformation discount rate are introduced, and the relative relations of CT value of dry test specimens and seepage test specimens with stress are analyzed. At the same time, the image measuring method to determine the width of cracks is proposed. The paper also introduces the numerical calculation method with which the width of cracks is determined according to the relative relations between the average CT data and measuring areas.

关 键 词：岩石力学 实时CT观测 渗流 三维应力状态 强度和变形折减率 

分 类 号：TU458[建筑科学—岩土工程]