Journal
ENGINEERING GEOLOGY
Volume 202, Issue -, Pages 74-84Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.enggeo.2016.01.003
Keywords
Water injection test; Rock mass; Hydraulic conductivity; Rock structure; Damage zone; Seepage evolution
Funding
- Fundamental Research Funds for the Central Universities [2015XKMS035]
- PAPD - Priority Academic Program Development of Jiangsu Higher Education Institutions
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In this study, in situ water injection tests and numerical modeling in conjunction with core logs and television image measurements were applied for an investigation of the hydraulic properties of the rock mass around underground excavations. The aim of our work was to investigate the influence of rock structure and water pressure on the hydraulic conductivity of the rock mass around underground excavations. Thus, water injection tests were conducted in four boreholes that were drilled in the rock mass in underground tunnels in China. Seepage connection initiation and steady state seepage were proposed to identify the seepage evolution course within the rock mass by combining the results of pressure and hydraulic conductivity. Generally, hydraulic conductivity is strongly related to rock structure and water pressure. The results also revealed that a rearrangement of rock structure would occur in the damage zone, resulting in an increase in hydraulic conductivity of nearly one to several orders of magnitude. The results from the modified numerical model showed that the pore water distribution and the groundwater inflow rate are affected by both the hydraulic conductivity and the thickness of the damage zone and they are influenced more by the thickness of this zone. (c) 2016 Elsevier B.V. All rights reserved.
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