Damage process and characteristics of layered water-bearing shale under uniaxial compression

被引：0
|
作者：
Teng J.-Y. [1 ,2 ]
Tang J.-X. [1 ,2 ]
Zhang Y.-N. [1 ,2 ]
Duan J.-C. [1 ,2 ]
Wang J.-B. [1 ,2 ]
机构：
[1] State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing
[2] College of Resources and Environmental Sciences, Chongqing University, Chongqing
来源：
Tang, Jian-Xin (jtxtang@cqu.edu.cn) | 1629年 / Academia Sinica卷 / 38期
关键词：
3DEC; Acoustic emission; Damage; Layered shale; Water content;
D O I：
10.16285/j.rsm.2017.06.011
中图分类号：
学科分类号：
摘要：
Shale widely distributed in Chongqing Region particularly accounts for a relatively large proportion in the surrounding tunnel of rock mass. The stratification and water significantly affect mechanical properties of shale, this study is to investigate the damage process of shale and its deterioration mechanism under the influence of stratification and water content using the MTS815 testing system and PAC acoustic emission (AE) instrument. AE experiments were performed in the damage process of layered shale under uniaxial compression. The damage mode of shale was further analyzed comparatively using the commercial software 3DEC. The damage process of shale was determined by its mineral component, mineral arrangement and loading direction. The distribution of macro-cracks was dominated by the distribution of pre-existing micro-crack, the size of mineral grain and loading direction. Moreover, the macro-cracks governed the damage mode of shale. The pre-existing micro-fissuring group towards the stratification direction inside the shale triggered the damage zones of shale. The secondary micro-cracks were generally found along the mineral boundary, which basically had the same direction as the loading direction. These micro-cracks were formed the macro-cracks, which connected the damaging surfaces of stratifications. The AE events of generation and distribution of layered shale were closely related to the distribution of micro-cracks inside the trial piece. The initial compression phase accumulated near the stratification in the central section of shale, then developed towards its ends or both sides along the normal direction of the stratification. It finally coalesced to the core along the turning point and intersection position of macro-cracks. The stratification and water had different damage and deterioration mechanism on shale. The effect of stratification on shale was essentially the damage effect of pre-existing micro-cracks group distributed along the stratification. However, the damage effect of water on shale is primarily depending on the water absorption and capillary pressure. © 2017, Science Press. All right reserved.
引用
收藏
页码：1629 / 1638and1646
相关论文
共 30 条
  • [1] He M.-C., Jing H.-H., Sun X.-M., Mechanics of Soft Rock Engineering, (2002)
  • [2] Zhang J.-C., Yang C., Chen Q., Et al., Study on the formation and distribution of the potential shale in China, Earth Science Frontiers, 23, 1, pp. 74-86, (2016)
  • [3] Martin C.D., Giger S., Lanyon G.W., Behaviour of weak shales in underground environments, Rock Mechanics and Rock Engineering, 49, 2, pp. 673-687, (2015)
  • [4] Zhu Z.-Q., Li H., Lu G.-Y., Et al., The research of advanced foreast of geology method in shallow cover up of tunnel of the shale region, Progress in Geophysics, 22, 1, pp. 250-254, (2007)
  • [5] Zou C.-N., Dong D.-Z., Wang S.-J., Et al., Geological characteristics, formation mechanism and resource potential of shale gas in China, Petroleum Exploration and Development, 37, 6, pp. 641-653, (2010)
  • [6] Yang Z., Wang W., Dong M., Et al., A model of dynamic adsorption-diffusion for modeling gas transport and storage in shale, Fuel, 173, pp. 115-128, (2016)
  • [7] Talonov A., Vasilyeva M., On numerical homogenization of shale gas transport, Journal of Computational and Applied Mathematics, 301, pp. 44-52, (2016)
  • [8] Rybacki E., Reinicke A., Meier T., Et al., What controls the mechanical properties of shale rocks?-Part I: Strength and Young's modulus, Journal of Petroleum Science and Engineering, 135, pp. 702-722, (2015)
  • [9] Rybacko E., Meier T., Dresen G., What controls the mechanical properties of shale rocks, Journal of Petroleum Science and Engineering, 144, pp. 39-58, (2016)
  • [10] Heng S., Yang C.-H., Zhang B.-P., Et al., Experimental research on anisotropic properties of shale, Rock and Soil Mechanics, 36, 3, pp. 609-616, (2015)
123