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

doi:10.3724/1000-6915.jrme.2025.0399

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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.

Key words： rock mechanics jointed rock mass triaxial SHPB strain rate initial stress state dynamic response

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	Articles by authors
	Xie Xiaokun1
	YUAN Wei2
	Shi Shaoshuai3
	WANG Haojun4
	5
	Rong Xiaoli1
	Wu Weitao1
	Hu Jie1*

Cite this article:

Xie Xiaokun1,YUAN Wei2,Shi Shaoshuai3, et al. Dynamic mechanical behavior of jointed rock mass under different initial stress states: experimental and numerical analysis[J]. , 2026, 45(S1): 132-149.

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2025.0399 OR https://rockmech.whrsm.ac.cn/EN/Y2026/V45/IS1/132

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