Rheological properties of quick-setting slurry considering heat exchange in high temperature fractured rock mass and its application
Grouting is one of the most commonly used methods in water disaster treatment in fractured rock mass under high temperature. When slurry with normal temperature diffuses in fractured rock under high temperature, slurry rheological properties actually undergo complex changes under the combined effect...
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Veröffentlicht in: | Construction & building materials 2024-08, Vol.438, p.137221, Article 137221 |
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Sprache: | eng |
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Zusammenfassung: | Grouting is one of the most commonly used methods in water disaster treatment in fractured rock mass under high temperature. When slurry with normal temperature diffuses in fractured rock under high temperature, slurry rheological properties actually undergo complex changes under the combined effects of time and heat exchange. This is especially true for quick setting slurry, whose rheological properties vary with time dramatically. However, most of the studies on slurry rheological properties are based on normal temperature or constant high temperature and there are few reports considering heat exchange, which cannot provide a scientific basis for effective grouting control in deep buried tunnel engineering. Therefore, study on rheological properties of quick setting slurry considering heat exchange was conducted in this paper. Firstly, time-varying equations of slurry temperature during grouting process were derived. Secondly, a characterizing method of slurry rheological properties considering heat exchange was proposed. Finally, a stepwise algorithm was developed and a grouting simulation test under high temperature was carried out to verify the proposed method. Here we show that heat exchange between slurry and surrounding rock has a significant influence on the rheological properties of quick setting slurry, which in turn affects the grouting pressure as well as the distribution of slurry pressure. Ignoring the influence of heat exchange process and calculating the slurry rheological parameters under constant high temperature would lead to an overestimation of grouting pressure. The calculation error was as high as 48 %. On the other hand, ignoring the influence of heat exchange process and calculating the rheological parameters under constant low temperature would lead to an underestimation of grouting pressure, with an error of 38 %. Comparison results show that experimental slurry temperature corresponded well with theoretical values, which verified the reliability of time-varying equations of slurry temperature. Theoretical curves of slurry pressure and grouting pressure considering heat exchange were in good agreement with the experimental values. The errors were within 10 %, which verified the accuracy of characterizing method proposed in this paper.
•Time-varying equation of slurry temperature considering heat exchange was derived.•A characterizing method of slurry rheology under high temperature was proposed.•A grouting simulation test under |
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ISSN: | 0950-0618 1879-0526 |
DOI: | 10.1016/j.conbuildmat.2024.137221 |