热损伤后北山花岗岩裂隙演化及渗透率试验研究

陈世万; 杨春和; 刘鹏君; 魏翔

doi:10.11779/CJGE201708017

热损伤后北山花岗岩裂隙演化及渗透率试验研究 English Version

陈世万¹,
杨春和^{1, 2},
刘鹏君³,
魏翔¹

1. 重庆大学煤矿灾害动力学与控制国家重点实验室,重庆 400044;
2. 中国科学院武汉岩土力学研究所,湖北武汉 430071;
3. 中国地质大学工程学院,湖北武汉430074

基金项目: 高放废物地质处置地下实验室安全技术评价研究（FZ1402）;国家自然科学基金重点项目（51234004）

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出版历程
- 收稿日期: 2016-03-28
- 发布日期: 2017-08-24

Evolution of cracks and permeability of granites suffering from different thermal damages

1. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China;
2. Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China;
3. Faculty of Engineering, China University of Geosciences, Wuhan 430074, China

摘要

摘要: 以高放废物重点预选场址甘肃北山花岗岩为研究对象,开展了不同温度和不同加热速率高温损伤后岩石压缩全过程渗透率试验。研究发现：①饱水率、波速、弹模、峰值强度等物理力学性质及渗透率突变温度阈值均在500℃~600℃之间;低于500℃处理后试件的初始渗透率无明显变化,600℃处理后,晶内裂纹的大量出现使裂纹连成网络,岩石的初始渗透率急剧增长,增长幅度达2~3个量级。②低于5℃/min,岩石的损伤主要由造岩矿物颗粒热膨胀系数和弹性模量的不同导致在颗粒间形成热应力造成的;高于5℃/min,温度梯度导致的热应力将诱发裂纹。③电镜扫描显微图像显示100℃~573℃处理后裂纹主要集中在晶粒边界,高于573℃处理后长石和石英晶体内相继出现穿晶裂纹,晶内破裂均贯通整个晶粒,与周围裂隙网络连接。④热处理后试件渗透率出现2种不同的渗透类型：600℃以下处理后试件在压缩全过程随应力增加渗透率分为下降段、水平段、稳定增长段和急剧上升段;600℃以上高温处理后,渗透率在压缩全过程持续降低。⑤弹性阶段前渗透率与裂隙体积应变呈现良好的线性关系,随裂隙体积的减小,渗透率降低。
- 热损伤 /
- 渗透率 /
- 加热速率 /
- 渗透类型 /
- 裂隙体积应变
Abstract: Beishan granite, the host rock of the pre-selected site of high-level radioactive waste geological repository in China, was used to study the evolution of permeability after thermal treatment under compressive condition. The main results are summarized as follows: (1) The temperature threshold existed in the range of 500℃ to 600℃. The physical and mechanical properties of granite suffered the temperature higher than the threshold changed rapidly. (2) The threshold of heating rate was identified as 5℃/min. The temperature gradient caused by hating rate higher than 5℃/min induced high thermal-stress to form cracks for standard samples. (3) The scanning electron microscope images revealed that the cracks concentrated around the grain boundary of samples subjected to temperature lower than 573℃, while the trans-granular cracks were observed in the granite samples heated to temperature higher than 573℃. The cracks in feldspar developed along the cleavage plane, so they were all smooth, however the cracks in quartz were rough due to no cleavage plane in it. (4) The permeability of samples suffering the temperature higher than 600℃ was much greater than that suffering the temperature lower than 600℃, which demonstrated the existence of temperature threshold for permeability. (5) Two typical stress-permeability curves were observed for the whole compression tests. For the specimens treated below 500℃, the stress-permeability can be characterized as three sequential stages, i.e., falling stage, maintaining low permeability during successive volume compaction, rapid growth when approaching the peak stress. However, the permeability almost decreased during the whole loading process for samples after thermal treatment, higherthan 500℃. (6) The crack volumetric strain was applied to analyze the evolution of permeability. Good linear relationship was found between the permeability and the crack volumetric strain.
- thermal damage /
- permeability /
- heating rate /
- permeability pattern /
- crack volumetric strain

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参考文献(21)

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