以CT扫描为基础的水—岩相互作用三维可视化重建及损伤研究

发布时间：2018-05-28 07:22

本文选题：水-岩相互作用 + CT　；参考：《西安理工大学》2017年硕士论文

【摘要】：水-岩相互作用是工程界经常遇到的科学课题,特别是岩体工程灾害,多数是因为水-岩相互作用使得岩体内部发生损伤破坏最终导致灾害发生,如边坡工程、水利工程等。为弄清水-岩相互作用过程中砂岩试样的损伤破坏规律,首先借助CT扫描技术,结合三轴加载设备和自行研发的渗透水压力装置对砂岩试样进行损伤破坏试验;通过MIMICS三维可视化重建软件验证试验;通过三维可视化重建得出重建砂岩试样的体积V和表面积S,再由表面积S间接导出CT扫描断面面积A,结合CT扫描试验所得CT数,从细观和宏观角度研究损伤破坏规律。主要得出以下结论:(1)先进行砂岩试样的损伤破坏试验,对破坏拆样后的砂岩试样外表进行不同方位的拍照,然后对破坏后最后一次CT扫描砂岩试样进行三维重建验证试验,得出三维重建与试验外表出现裂纹一致;且在损伤试验过程中,通过三维重建可以观测到砂岩试样内部、及外表都是先出现少量初始微裂纹,接着在初始微裂纹附近集中、爆发式出现大量裂纹,在局部没有初始微裂纹的地方也出现少量新的微裂纹。(2)在细观角度,以相邻CT扫描区间砂岩试样为损伤小组,将CT数作为细观损伤变量时,砂岩试样先经过一个线性初始压密阶段,压密到一定程度后,出现线性损伤破坏迹象;将以三维可视化重建为基础的断面面积A作为细观损伤变量时砂岩试样先经过一个线性初始压密阶段,压密到一定程度后,出现指数式的损伤破坏迹象。(3)以三维可视化重建为基础,从宏观角度以砂岩试样整体为研究对象,将重建体积V和重建表面积S作为宏观损伤变量,得出将重建体积V和重建表面积S作为宏观损伤变量时,砂岩试样先经过初始的线性压密阶段,压密到一定程度后,出现指数式损伤破坏迹象。(4)处于水-岩相互作用下的砂岩试样更容易出现损伤破坏迹象。
[Abstract]:Water-rock interaction is a common scientific subject in engineering field, especially in rock mass engineering. Most of the problems are caused by water-rock interaction, such as slope engineering, water conservancy engineering and so on. In order to deal with the damage and failure rule of sandstone specimen during the process of water-rock interaction, the damage and failure test of sandstone specimen was carried out by means of CT scanning technology, combined with triaxial loading equipment and permeable water pressure device developed by ourselves. The volume V and surface area S of reconstructed sandstone samples were obtained by 3D visualization reconstruction software of MIMICS, then CT scanning sectional area A was indirectly derived from surface area S, and CT number was obtained by combining CT scanning test. The damage failure law is studied from the view of meso-scale and macro-view. The main conclusions are as follows: (1) the damage and failure tests of sandstone samples are carried out first, and the different orientation photographs of the sandstone samples after the destruction are taken, and then the 3D reconstruction verification test is carried out on the last CT scan sandstone samples after the destruction. In the process of damage test, it can be observed that a small amount of initial microcracks appear in the inside and outside of sandstone samples, and then they are concentrated near the initial microcracks in the process of damage test. A large number of cracks appear in explosion, and a small number of new microcracks appear in the places where there are no initial microcracks. In the meso-angle, when the adjacent CT scanning interval sandstone samples are taken as the damage group, the number of CT is taken as the mesoscopic damage variable. The sandstone sample passes through a linear initial compaction stage, after compaction to a certain extent, there are signs of linear damage and failure. When the cross-section area A based on 3D visualization reconstruction is taken as the mesoscopic damage variable, the sandstone specimen goes through a linear initial compaction stage, and then compacted to a certain extent. The appearance of exponential damage signs is based on 3D visual reconstruction. From the macro point of view, the volume V and surface area S of the reconstruction are taken as macroscopic damage variables, and the sandstone sample as a whole is taken as the research object, and the reconstruction volume V and the reconstruction surface area S are taken as macroscopic damage variables. When the reconstruction volume V and the reconstructed surface area S are taken as macroscopic damage variables, the sandstone sample goes through the initial linear compaction stage, and the compression reaches a certain degree. The sandstone samples under the water-rock interaction are more likely to appear the signs of damage and failure.
【学位授予单位】：西安理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV223

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