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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     Next 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"

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