Journal
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
Volume 89, Issue -, Pages 1-9Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tust.2019.03.015
Keywords
Strength; Filtration; Cement grouts; Porous media; Permeability
Funding
- National Basic Research Program of China [2015CB060200]
- National Natural Science Foundation of China [41772313]
- Fundamental Research Funds for the Central Universities of Central South University [2016zzts093]
- Chinese Scholarship Council
- University of Newcastle, Australia
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The diffusion of cement-based grouts in porous media is an important issue in soil sealing and grouting effects. To better understand the effects of grouting parameters, including grouting temperature, water-cement ratios and mass fractal dimensions, on the retention of slurry particles, the permeability of injected media, and the strength of cementation under a constant pressure condition, several types of tests, including filtration, permeability and uniaxial compressive strength tests, were performed. The experimental results indicate the following: (1) The retention rate of cement particles decreases sharply with an increase in the distance from the grouting source in the porous media with a higher mass fractal dimension, whereas the retention rate of cement particles decreases slowly with increasing diffusion distance in the porous media with a lower mass fractal dimension. (2) Within a certain distance, the retention of cement particles at a lower temperature is slightly higher than that at a higher temperature. Beyond this critical distance, the retention of cement particles at a lower temperature is generally lower than that at a higher temperature. (3) Regardless of the cement slurry, the damage is not uniform in the injected porous media. (4) The compressive strength of the porous media with a higher fractal dimension at the test point near the grouting source is higher than that of the media with a lower fractal dimension. However, at the test point far from the grouting source, the compressive strength of the porous media with a lower fractal dimension is greater than that of the media with a higher fractal dimension.
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