Experimental investigation of the influencing factors on the mechanical properties of grouted fractured rock mass
LIU Xuewei1, 2, LIU Yunhao1, 2, LIU Bin1, 2, WANG Sai1, LIU Quansheng3, ZHU Lei1, ZHU Yuanguang1, 2
(1. State Key Laboratory of Geomechanics and Geotechnical Engineering Safety, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China;
3. School of Civil Engineering, Wuhan University, Wuhan, Hubei 430072, China)
Abstract：Grouting as a main technical means for stability control of fractured surrounding rock, its reinforcement effect is controlled by many factors. To investigate the effect of inclination angle and rock matrix on grouting reinforcement, this paper carried out uniaxial compression tests of grouted coal, mudstone and sandstone specimens with different crack inclination angles (? = 0°, 15°, 30°, 45°, 60°). Combined with the digital image correlation (DIC) and acoustic emission (AE) technology, the evolution characteristics of their mechanical properties were investigated. Test results showed that: (1) the peak strength showed a tendency of decreasing and then increasing with the increase of inclination angle for different rock specimen; the damage mode of the grouted fractured coal and mudstone specimens shifts from split tensile to shear failure along the fracture, whereas the sandstone specimens were dominated by interfacial shear damage. (2) The DIC results showed that the maximum principal strains of different specimens first increase and then decrease as fracture inclination angle increases, which the mudstone specimens had the smallest value, and the coal specimens had the smallest changes in the strain field. (3) The acoustic emission characteristics showed that the percentage of tensile microcracks decreased with the increase of inclination angle. Combined with the analysis of acoustic emission b-value, the mudstone and sandstone specimens had the smallest and highest degree of failure, respectively. Finally, the slurry-rock interface correlation coefficient k was proposed to analyze the mechanical property evolution mechanism of the grouted fractured rock mass. Results indicated the inclination angle and rock matrix jointly controlled the mechanical behavior of the grouted fractured rock mass through the rock strength and slurry-rock interface characteristics. The above study provides theoretical and experimental basis for the design of grouting reinforcement and stability analysis of surrounding rock in deep tunnel.
刘学伟1，2，刘云豪1，2，刘 滨1，2，王 赛1，刘泉声3，朱 磊1，朱元广1，2. 注浆裂隙岩体力学特性影响因素试验研究[J]. 岩石力学与工程学报, 2025, 44(7): 1782-1799.
LIU Xuewei1, 2, LIU Yunhao1, 2, LIU Bin1, 2, WANG Sai1, LIU Quansheng3, ZHU Lei1, ZHU Yuanguang1, 2. Experimental investigation of the influencing factors on the mechanical properties of grouted fractured rock mass. , 2025, 44(7): 1782-1799.
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2025, Vol. 44 
