Abstract
Long-term stability evaluation of grouting materials is critical to the safe operation of geological engineering. Taking blocky No. 8 coalseam of Huaibei coalfield as engineering background, taking coal fragmentation distribution and grouting quantity as the control variables, uniaxial compression tests were conducted every 1 or 2 months to study long-term mechanical behavior of silica sol grout. Results indicated that (a) long-term strength stability of samples could not be achieved in the case that silica sol was mixed into coal samples including big fragments (5–10 mm); (b) in the case that silica sol was mixed into coal sample without big fragments (5–10 mm), 200 days was the least maintenance time that the strength need to turn stable; (c) in the case that silica sol was mixed into the coal samples with small fragments (< 2 mm), long-term stiffness of samples could be achieved. In other words, coal fragmentation had a negative correlation with the long-term consolidated stability of silica sol grouting. Generally, grouting quantity had a linear positive correlation with strength, peak strain, brittleness coefficient, and had an exponential function increasing relation with pre-peak strain energy density. But grouting quantity was of no influence on secant modulus. There existed a lower limit of grouting quantity and long-term stability of silica sol grouting strength couldn’t be achieved when grouting quantity was below the limit. The research results can guide grouting design and long-term stability evaluation of grouting.
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Acknowledgements
This work was supported by National Natural Science Foundation of China (51674244); Science and Technology Innovation Program of China Railway Tunnel Group Co., Ltd (Suiyanhe 2018-06); Henan Province Key R&D and Extension Project (Key scientific and technological problems tackling) (192102310284); Innovative Research Teams in University by Ministry of Education of China (IRT_14R55).
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Pan, D., Sun, Z., Zhou, J. et al. Incorporating Silica Sol as a Binder to Improve Long-Term Stability of Blocky Coal. Geotech Geol Eng 38, 3597–3610 (2020). https://doi.org/10.1007/s10706-020-01237-1
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DOI: https://doi.org/10.1007/s10706-020-01237-1