刘吉祥, 赵钺, 沈彦丞,等. 无充填和石膏充填预制裂隙花岗岩力学特性与能量演化差异研究[J].河南理工大学学报(自然科学版)，doi: 10.16186/j.cnki.1673-9787. 2024040009.

LIU J X, ZHAO Y, SHEN Y C, et al. Study on the differences in mechanical properties and energy evolution of unfilled and gypsum filled pre-cracked granite[J]. Journal of Henan Polytechnic University(Natural Science), doi: 10.16186/j.cnki.1673-9787. 2024040009.

无充填和石膏充填预制裂隙花岗岩力学特性与能量演化差异研究(网络首发)

刘吉祥¹，赵钺¹，沈彦丞¹，赵尔丞¹，张春阳²，谭涛²

1. 兰州有色冶金设计研究院有限公司,甘肃 兰州 730000；2. 武汉理工大学资源与环境工程学院,湖北 武汉 430070

摘要：目的 裂隙对工程岩体的力学性能和稳定性带来了不利影响，而充填物在一定程度上可起到加固作用，此外裂隙岩体在破坏过程中的能量演化规律则反映了充填物的加固机理；因此，为了探索无充填物和有充填物两类状态下预制裂隙花岗岩试件的力学特性和能量演化差异，方法 预制了包含中心圆孔的不同裂隙倾角花岗岩试件，并考虑了石膏充填状态的影响，通过单轴压缩试验探讨了试件的力学行为和储能特性。结果 结果表明：无充填物和石膏充填下花岗岩的峰值强度和弹性模量随预制裂隙倾角增大而线性增大，峰值总输入能和储能极限随预制裂隙倾角增大而指数增加。可见石膏充填并未改变预制裂隙对花岗岩峰值强度、弹性模量以及能量吸收和存储演化规律的影响，但石膏填充增强了试件的完整性，且能吸收外界输入的能量，使其破坏所需的能量和储能水平得到提升，且这种增强效果在预制裂隙倾角为0～60°时较为显著，而60～90°时减弱。此外，为了表征试件破坏过程中的能量演化特征，通过能量抑制原理提出了对应的弹性应变能演化模型，并验证了该能量模型的可靠性。结论 研究结果可为裂隙岩体的注浆加固提供理论指导。

关键词:预制裂隙花岗岩试件；石膏充填；单轴压缩试验；力学特性；能量演化规律

doi: 10.16186/j.cnki.1673-9787. 2024040009

基金项目:国家自然科学基金资助项目(52174088)

收稿日期：2024-04-05

修回日期：2024-06-14

网络首发日期：2025-03-28

Study on the differences in mechanical properties and energy evolution of unfilled and gypsum filled pre-cracked granite (Online)

LIU Jixiang¹, ZHAO Yue¹, SHEN Yancheng¹, ZHAO Er-cheng¹, 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 Cracks have adverse effects on the mechanical properties and stability of engineering rock masses, and filling materials can play a strengthening role to a certain extent. In addition, the energy evolution law of fractured rock masses during the failure process reflects the reinforcement mechanism of filling materials. Therefore, in order to explore the differences in mechanical properties and energy evolution of pre-cracked granite specimens with and without filling materials, Methods granite specimens with different pre-crack inclination angles including central circular holes were prefabricated, and their mechanical behavior and energy storage characteristics were explored by uniaxial compression test considering the influence of gypsum filling state. Results The results show that the peak strength and elastic modulus of unfilled and gypsum filled granite increase linearly with the increase of pre-crack inclination angle, while the peak total input energy and energy storage limit increase exponentially with the increase of pre-crack inclination angle. It can be seen that gypsum filling does not change the influence of pre-cracks on the peak strength, elastic modulus, energy absorption, and storage evolution of granite. However, the gypsum enhances the integrity of the specimen and can absorb external input energy, resulting in an increase in the energy required for its failure and energy storage level. This enhancement effect is more significant when the pre-crack inclination angle is 0-60°, and weakens when it is 60-90°. In addition, in order to characterize the energy evolution of the specimen during the failure process, a corresponding elastic strain energy evolution model was proposed based on the energy suppression principle, and the reliability of the energy model was verified. Conclusions The research results can provide theoretical guidance for grouting reinforcement of fractured rock masses.

Key words: pre-cracked granite specimen; gypsum filling; uniaxial compression test; mechanical properties; energy evolution law