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作者:

Yin, Qian (Yin, Qian.) | Jing, Hongwen (Jing, Hongwen.) | Ma, Guowei (Ma, Guowei.) | Su, Haijian (Su, Haijian.) | Liu, Richeng (Liu, Richeng.)

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SCIE

摘要:

This study experimentally investigated the internal fracture geometries and hydraulic properties of deformable rock samples subjected to various loading paths. Three loading paths, uniaxial compression, conventional triaxial compression, and triaxial prepeak unloading, were administered to granite samples. A high-precision X-ray microfocus-computed-tomography scanning system was adopted to explore the internal failure modes of the deformable samples, and a series of flow tests with different hydraulic pressures and confining stresses were then performed. The results show that the samples after uniaxial compression exhibit a typical splitting failure mode; however, for conventional triaxial compression and prepeak unloading, the samples generally show tensile-shear failure modes. The relationship between the flow rate and pressure gradient of the sample after uniaxial compression can be best described using the Forchheimer law. Both the linear and nonlinear coefficients in the Forchheimer law increase with increasing confining stress. As the confining stress increases from 4 to 20 MPa, the critical hydraulic gradient that quantifies the onset of nonlinear flow increases from 5.33 to 56.74, but the transmissivity decreases due to the fracture closure. For water flow through the samples after conventional triaxial compression and prepeak unloading, two representative types of nonlinear flow behaviors induced by inertial effects and fracture dilation were observed. Different loading paths lead to different failure mechanisms and thus different fluid-flow responses, and the samples subjected to prepeak unloading with a high confining pressure possess a more significant flow capacity.

关键词:

Equivalent permeability Loading paths Rock fracture Laboratory experiments/measurements Groundwater flow

作者机构:

  • [ 1 ] [Yin, Qian]China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, Xuzhou 221116, Jiangsu, Peoples R China
  • [ 2 ] [Jing, Hongwen]China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, Xuzhou 221116, Jiangsu, Peoples R China
  • [ 3 ] [Su, Haijian]China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, Xuzhou 221116, Jiangsu, Peoples R China
  • [ 4 ] [Liu, Richeng]China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, Xuzhou 221116, Jiangsu, Peoples R China
  • [ 5 ] [Ma, Guowei]Beijing Univ Technol, Coll Architecture & Civil Engn, Beijing 100124, Peoples R China

通讯作者信息:

  • [Liu, Richeng]China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, Xuzhou 221116, Jiangsu, Peoples R China

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来源 :

HYDROGEOLOGY JOURNAL

ISSN: 1431-2174

年份: 2019

期: 7

卷: 27

页码: 2617-2635

2 . 8 0 0

JCR@2022

ESI学科: GEOSCIENCES;

ESI高被引阀值:123

JCR分区:2

被引次数:

WoS核心集被引频次: 8

SCOPUS被引频次: 8

ESI高被引论文在榜: 0 展开所有

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