Abstract
With the development of underground engineering, dynamic disasters, such as rock bursts, are becoming increasingly serious. Bolt-grouting combined support is one of the common support methods, aiming at the prevention and control of dynamic disasters in fractured surrounding rock of underground engineering. However, the design of bolt-grouting supports is based mainly on experience, and the antishock characteristics need further study for fractured rock masses reinforced by bolt-grouting, which provides a scientific basis for the design of surrounding rock roadway reinforcement. Therefore, we carried out an experimental study on the dynamic mechanical properties of bolted and grouted red sandstones containing prefabricated fractures with different dip angles. The test results show that the dynamic peak strength and the deformation capacity decrease with increasing of fracture dip angle. Compared with the unreinforced samples, the dynamic peak strength and dynamic peak strain of bolt and grouting reinforced samples are improved, and the reinforced rock samples have higher impact resistance and deformation capacity. As the fracture dip angle increases, the incident energy, reflection energy, and transmission energy all show a decreasing trend. Bolt and grouting play the role of energy absorption and increasing antishock, and the dissipation rate of bolted-grouted rock samples is improved. The failure mode of the unreinforced samples is shear failure, the damage of which is more severe than that of bolt and grouting reinforced samples. For the bolt-grouting samples, tensile failure is observed at a low strain rate, and shear failure occurred at a high strain rate.
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Funding
This work was supported by the National Natural Science Foundation of China (No. 52178388), the Science and Technology Project of Henan Province (222102320381, NSFRF230632), the Doctor Foundation of Henan Polytechnic University (B2019-35), and the Fundamental Research Funds for the Universities of Henan Province (NSFRF230410).
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Yang, D., Li, J., Ding, S. et al. Study on the impact resistance of prefabricated fractured red sandstone samples with different dip angles reinforced by bolt-grouting. Bull Eng Geol Environ 82, 379 (2023). https://doi.org/10.1007/s10064-023-03383-1
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DOI: https://doi.org/10.1007/s10064-023-03383-1