LIU J X, ZHAO Y, SHEN Y C,et al.Mechanical properties and energy evolution of unfilled and gypsum-filled precracked granite[J].Journal of Henan Polytechnic University(Natural Science) ,2026,45(4):150-158.

doi:10.16186/j.cnki.1673-9787.2024040009

Received:2024/04/05

Revised:2024/06/14

Published:2026/06/17

Mechanical properties and energy evolution of unfilled and gypsum-filled precracked granite

Liu Jixiang1, Zhao Yue1, Shen Yancheng1, Zhao Ercheng1, Zhang Chunyang2, Tan Tao2

1.Lanzhou Engineering & Research Institute of Nonferrous Metallurgy Co.， Ltd.， Lanzhou  730000， Gansu， China;2.School of Resources and Environmental Engineering， Wuhan University of Technology， Wuhan  430070， Hubei， China

Abstract: Objectives To investigate the differences in mechanical properties and energy evolution characteristics of precracked granite specimens under unfilled and gypsum-filled conditions， a comparative study on the mechanical behavior and energy evolution of unfilled and gypsum-filled precracked granite was conducted.  Methods Granite specimens containing a central circular hole and prefabricated cracks with different inclination angles were prepared. Considering the influence of gypsum filling， uniaxial compression tests were carried out to investigate the mechanical behavior and energy storage characteristics of the specimens.  Results The results show that the peak strength and elastic modulus of both unfilled and gypsum-filled granite increase linearly with increasing crack inclination angle， whereas the peak total input energy and energy storage limit increase exponentially. Gypsum filling does not alter the influence of prefabricated cracks on the peak strength， elastic modulus， or energy evolution characteristics of granite. However， gypsum filling improves specimen integrity and absorbs part of the external input energy， thereby increasing both the energy required for failure and the energy storage capacity of the specimens. This enhancement effect is more pronounced when the crack inclination angle ranges from 0°to 60°， but becomes weaker when the angle ranges from 60° to 90°. In addition， to characterize the energy evolution during specimen failure， an elastic strain energy evolution model based on the energy suppression principle was proposed， and its reliability was verified.  Conclusions The results can provide theoretical guidance for grouting reinforcement of fractured rock masses.

Key words:precracked granite;gypsum filling;uniaxial compression test;energy evolution