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Gold Science and Technology ›› 2021, Vol. 29 ›› Issue (3): 355-363.doi: 10.11872/j.issn.1005-2518.2021.03.204

• Mining Technology and Mine Management • Previous Articles    

Seepage Characteristics of Damaged Rock Under Stress-Seepage Coupling

Jianhua HU(),Zhezhe DONG,Shaowei MA(),Yaguang QIN,Xiao XU,Zhuan Dai   

  1. School of Resources and Safety Engineering，Central South University，Changsha 410083，Hunan，China
  • Received:2020-11-29 Revised:2021-03-08 Online:2021-06-30 Published:2021-07-14
  • Contact: Shaowei MA E-mail:hujh21@126.com;mashaowei@csu.edu.cn

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Abstract:

During the mining of underground mineral resources，the deep hard rock will be damaged by the frequent stress disturbances.Its internal pores and fissures will rapidly expand and penetrate under the state of high ground stress and high osmotic pressure，which seriously threatens the safety and stability of rock mass engineering.The damage degree D is defined by the ratio of axial stress σ to compressive strength σc.Pre-damaged rock samples with different damage degrees （0%，25%，40%，50%，65%，75%，100%） were prepared by uniaxial compression test.A series of stress-seepage coupling tests were carried out for 75% damaged granite.Combined with CT scanning，considering the influence of seepage pressure，confining pressure and damage degree，the mechanical and seepage characteristics of damaged rock under stress-seepage coupling was comprehensive analyzed.The research results show that with the increase of damage degree，the number and size of pore and fracture of rock sample increase significantly，and changes of the volume of pore and fracture of rock sample shows a trend of increase gently and increase steadily to increase sharply.Under the same confining pressure，the peak strength of the rock sample shows a linear decrease with the increase of osmotic pressure，the osmotic pressure has a significant weakening effect on the strength of damaged granite，and the degree of weakening is independent of the confining pressure.The permeability of pre-damaged rock samples is closely related to the volume of pores and fractures.The variation trend of permeability with damage percentage confirms the evolution law of pores in different development stages.The greater the degree of damage，the higher the degree of fracture development and the greater the permeability.At the same time，the permeability can be characterized by the degree of development of pores and fractures.With the same degree of fracture development，the greater the confining pressure，the smaller the permeability.

Key words: rock mechanics, damage granite, stress-seepage coupling, permeability, CT scan, damage degree

CLC Number: 

  • TU45

Fig.1

Granite samples"

Table 1

Basic physical and mechanical parameters of granite"

参数数值参数数值
密度/（g·cm-3）2.55黏聚力/MPa27.6
孔隙率/%0.823泊松比0.25
抗压强度/MPa180弹性模量/GPa52.87

Fig.2

Macroscopic damage diagram of granite"

Fig.3

GCTS RTR-1500 rock triaxial testing machine"

Fig.4

Visualization steps of pores and fractures"

Fig.5

Schematic diagram of test principle"

Table 2

Control parameters of seepage-stress coupling test"

岩样编号渗透压ΔP/MPa围压σ3/MPa
A11，A12，A13015
A21，A22，A23025
B11，B12，B13415
B21，B22，B23425
C11，C12，C13815
C21，C22，C23825
D11，D12，D131215
D21，D22，D231225

Table 3

Control parameters of seepage test"

岩样编号初始渗透压?P/MPa围压σ3/MPa损伤百分比 /%

E11，E12，E13

E21，E22，E23

2

15

25

25→40→50→65→75
2

Fig.6

Display diagram of pores and fractures with different damage degrees"

Fig.7

Volume-damage degree curve of pores and fractures"

Fig.8

Partial stress-strain curves under different osmotic pressure"

Fig.9

Peak intensity-osmotic pressure fitting curves"

Fig.10

Permeability-damage percentage curves"

Calamak M，Yanmaz A M，2016.Uncertainty quantification of transient unsaturated seepage through embankment dams［J］.International Journal of Geomechanics，DOI：10.1061/（ASCE）GM.1943-5622.0000823.
doi: 10.1061/（ASCE）GM.1943-5622.0000823
Eberhardt E，Stead D，Stimpson B，1999.Quantifying progressive pre-peak brittle fracture damage in rock during uniaxial compression［J］.International Journal of Rock Mechanics and Mining Sciences，36：361-380.
Hassan S，Rodriguez D G，Cascante G，al et，2020.Effects of a fracture on ultrasonic wave velocity and attenuation in a homogeneous medium［J］.Geotechnical Testing Journal，43（2）：20180200. DOI：10.1520/GTJ20180200.
doi: 10.1520/GTJ20180200
Hu Dawei，Zhou Hui，Pan Pengzhi，al et，2010.Study of permeability of sandstone in triaxial cyclic stress tests［J］.Rock and Soil Mechanics，31（9）：2749-2754.
Hu Shaohua，Chen Yifeng，Zhou Chuangbing，2014.Laboratory test and mesomechanical analysis of permeability variation of Beishan granite［J］.Chinese Journal of Rock Mechanics and Engineering，33（11）：2200-2209.
Huang Yuanzhi，Wang Enzhi，2007.Experimental study of the laws between the effective confirming pressure and rock permeability［J］.Journal of Tsinghua University（Science and Technology），47（3）：38-41.
Ju J，Li Q，Xu J，al et，2020.Self-healing effect of water-conducting fractures due to water-rock interactions in undermined rock strata and its mechanisms［J］.Bulletin of Engineering Geology and the Environment，79（1）：287-297.
Ku C Y，Liu C Y，Su Y，al et，2018.Modeling of transient flow in unsaturated geomaterials for rainfall-induced landslides using a novel spacetime collocation method［J］.Geofluids，2018：1-16.
Li Wenliang，Zhou Jiaqing，He Xianglan，al et，2017.Nonlinear flow characteristics of broken granite subjected to confining pressures［J］.Rock and Soil Mechanics，38（Supp.1）：140-150.
Luo Z，Wang W，Qin Y，al et，2019.Early warning of rock mass instability based on multi-field coupling analysis and microseismic monitoring［J］.Transactions of Nonferrous Me-tals Society of China，29（6）：1285-1293.
Wang Wei，Chen Xi， Tian Zhenyuan，al et，2016.Experimental study on stress-seepage coupling properties of sandstone under different drainage conditions［J］.Chinese Journal of Rock Mechanics and Engineering，35（Supp.2）：3540-3551.
Wang Wei，Xu Weiya，Wang Rubin，al et，2015.Permeability of dense rock under triaxial compression［J］.Chinese Journal of Rock Mechanics and Engineering，34（1）：40-47.
Wang Xusheng，Chen Zhanqing，2006.Hydrodynamic analysis of transient method in rock［J］.Chinese Journal of Rock Me-chanics and Engineering，25（Supp.1）：3098-3103.
Yang Xiurong，Jiang Annan，Zhang Fengrui，al et，2019.Experimental study on seepage characteristics of red sandstone with different confining pressure and different damage degree［J］.Journal of China Coal Society，44（Supp.1）：101-109.
Yin Liming，Guo Weijia，Chen Juntao，2014.Development of true triaxial rock test system of coupled stress-seepage and its application［J］.Chinese Journal of Rock Mechanics and Engineering，33（Supp.1）：2820-2826.
Zhang Junwen，Song Zhixiang，Fan Wenbing，al et，2019.Experimental study on mechanical behavior and permeability characteristics of sandstone under stress-seepage coupling［J］.Chinese Journal of Rock Mechanics and Engineering，38（7）：1364-1372.
Zhang Peisen，Hou Jiqun，Zhao Chengye，al et，2020.Experimental study on seepage characteristics of red sandstone with different confining pressure and different damage degree［J］.Chinese Journal of Rock Mechanics and Engineering，39（12）：1-11.
Zhao Y J，Wang F G，Li C，al et，2018.Study of the corrosion characteristics of tunnel fissures in a karst area in southwest China［J］.Geofluids，2018：1-19.
Zheng Zhi，Qin Jiajun，Wu Kunming，al et，2017.Permeability measurement method and experimental study on hard rock failure process［J］.Journal of Hubei Engineering University，37（3）：78-80.
Zuo Yujun，Sun Wenjibin，Wu Zhonghu，al et，2018.Experiment on permeability of shale under osmotic pressure and stress coupling ［J］.Rock and Soil Mechanics，（9）：3253-3260.
胡大伟，周辉，潘鹏志，等，2010.砂岩三轴循环加卸载条件下的渗透率研究［J］.岩土力学， 31（9）：2749-2754.
胡少华，陈益峰，周创兵，2014.北山花岗岩渗透特性试验研究与细观力学分析［J］.岩石力学与工程学报，33（11）：2200-2209.
黄远智，王恩志，2007.低渗透岩石渗透率与有效围压关系的实验研究［J］.清华大学学报（自然科学版），47（3）：38-41.
李文亮，周佳庆，贺香兰，等，2017.不同围压下破碎花岗岩非线性渗流特性试验研究［J］.岩土力学，38（增1）：140-150.
王伟，陈曦，田振元，等，2016.不同排水条件下砂岩应力渗流耦合试验研究［J］.岩石力学与工程学报，35（增2）：3540-3551.
王伟，徐卫亚，王如宾，等，2015.低渗透岩石三轴压缩过程中的渗透性研究［J］.岩石力学与工程学报，34（1）：40-47.
王旭升，陈占清，2006.岩石渗透试验瞬态法的水动力学分析［J］.岩石力学与工程学报，25（增1）：3098-3103.
杨秀荣，姜谙男，张峰瑞，等，2019.破裂石灰岩在渗透压—应力耦合作用下渗流特性研究［J］.煤炭学报，44（增1）：101-109.
尹立明，郭惟嘉，陈军涛，2014.岩石应力—渗流耦合真三轴试验系统的研制与应用［J］.岩石力学与工程学报，33（增1）：2820-2826.
张俊文，宋治祥，范文兵，等，2019.应力—渗流耦合下砂岩力学行为与渗透特性试验研究［J］.岩石力学与工程学报，38（7）：1364-1372.
张培森，侯季群，赵成业，等，2020.不同围压不同损伤程度红砂岩渗流特性试验研究［J］.岩石力学与工程学报，39（12）：1-11.
郑志，秦佳俊，吴坤铭，等，2017.硬岩破坏过程中渗透率测定方法与试验研究［J］.湖北工程学院学报，37（3）：78-80.
左宇军，孙文吉斌，邬忠虎，等，2018.渗透压—应力耦合作用下页岩渗透性试验［J］.岩土力学，（9）：3253-3260.
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