Dynamic mechanical behavior of jointed rock mass under different initial stress states: experimental and numerical analysis
Xie Xiaokun1, YUAN Wei2, Shi Shaoshuai3, WANG Haojun4, 5, Rong Xiaoli1, Wu Weitao1, Hu Jie1*
(1. School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu 210094, China; 2. School of Civil Engineering and Surveying and Mapping Engineering, Jiangxi University of Science and Technology, Ganzhou, Jiangxi 341000, China; 3. School of Qilu Transportation, Shandong University, Ji'nan, Shandong 250002, China; 4. Department of Civil Engineering, Monash University, Melbourne VIC 3800, Australia；5. State Nuclear Electric Power Planning, Design and Research Institute Co., Ltd., Beijing 100095, China)
Abstract：Prior to blasting excavation, the jointed surrounding rock is subjected to a complex in-situ stress field. During blasting, the combined effect of in-situ stress and dynamic loading may induce dynamic disasters such as collapse. To investigate the dynamic response of jointed rock masses under complex stress conditions, systematic tests were performed on jointed sandstone subjected to confining pressure, biaxial, and true triaxial pre-stresses. Both a conventional confining pressure SHPB system and a true triaxial SHPB device were employed to investigate the evolution of dynamic compressive strength and failure modes. Furthermore, discrete element simulations using UDEC and 3DEC were conducted to investigate crack initiation and propagation paths at different strain rates. These simulations provided deeper insights into the micro-mechanical damage mechanisms of jointed rock mass under multi-axial stress states. Experimental results further indicate that the dynamic compressive strength of jointed sandstone is highly sensitive to these multiaxial stress conditions. Axial prestress () promotes crack initiation and reduces strength, whereas lateral prestress(,) and confining pressure () effectively suppress crack propagation and enhance load-bearing capacity. The most pronounced strength increase is observed under true triaxial confinement. Failure modes vary depending on the stress constraint conditions. Under confining pressure, specimens exhibit conical compression-shear failure. Under biaxial constraint, failure is dominated by tensile fractures along multiple surfaces. Under triaxial constraint, composite failure occurs, including localized spalling at the specimen ends. Discrete element simulations reveal that stress concentration at the intersection of cross joints is the primary mechanism driving crack initiation and propagation. Additionally, the simulations clarify the relationship between microscopic damage evolution and macroscopic failure modes.
谢肖坤1，袁 伟2，石少帅3，王昊俊4, 5，戎晓力1，吴威涛1，胡 杰1*. 不同初应力状态下节理岩体动态力学响应特征的试验和数值研究[J]. 岩石力学与工程学报, 2026, 45(S1): 132-149.
Xie Xiaokun1, YUAN Wei2, Shi Shaoshuai3, WANG Haojun4, 5, Rong Xiaoli1, Wu Weitao1, Hu Jie1*. Dynamic mechanical behavior of jointed rock mass under different initial stress states: experimental and numerical analysis. , 2026, 45(S1): 132-149.
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2026, Vol. 45 
