Abstract
The grouting rate and pre-damage degree of grouted rock mass always influence its macro-mechanical properties. In this paper, a series of experimental uniaxial compression tests of cubic rock-like specimens were conducted to investigate the influencing law of the grouting rate and pre-damage degree on the mechanical behaviors and failure characteristics of a grouted rock mass. The results show that the failure pattern of the grouted specimens is mainly dominated by splitting failure and the increasing grouting rate enhances the load-bearing performance and decreases the failure extent of the specimens. The peak strength values decrease with the increasing pre-damage degree of the specimens, and the relationship is approximately linear. Unlike the peak strength, the elastic modulus values form a parabola that increases with the increase of the pre-damage degree. The grouted specimens with a small pre-damage degree have little fracture propagation and better integrity. It is illustrated that an increased pre-damage degree of the grouted specimens causes more fissures. Fissures provide more space for grouting, and the increase in cement grout improves the rigidity of the specimens.
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Acknowledgements
This research is financially supported by the Key Scientific Research Projects of Higher Education Institutions in Henan Province (Grant No. 20A560019), the Nanhu Scholars Program of Xinyang Normal University and the Natural Science Foundation of China (Grant No. 41807240). The author gratefully acknowledges the financial support provided by them.
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Ma, W.Q., Wang, T.X. & Ma, Z.Y. Experimental Investigation on Uniaxial Compressive Responses of Grouted Rock-Like Material. Geotech Geol Eng 38, 2653–2662 (2020). https://doi.org/10.1007/s10706-019-01176-6
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DOI: https://doi.org/10.1007/s10706-019-01176-6