注浆加固裂隙砂岩的破坏机制、动力特性及断裂损伤模型

doi:10.3724/1000-6915.jrme.2026.0004

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Abstract To investigate the effects of fracture width and grouting reinforcement on the dynamic mechanical properties of sandstone under blast loading, the split Hopkinson pressure bar(SHPB) impact test, combined with high-speed photography, can be utilized to investigate the dynamic mechanical properties of intact sandstone, fractured sandstone with varying crack widths, and grout-reinforced fractured sandstone under blast loading. Based on fracture mechanics theory, the stress intensity factors of various rock specimens were evaluated, and a dynamic constitutive model was established. The results indicate that: (1) fractured sandstone exhibit a failure mode primarily characterized by shear, supplemented by tensile failure. Following grouting, the failure pattern transitions to predominantly axial tension, accompanied by secondary radial tension, with a significantly reduced degree of damage. As the grout absorbs and reflects a substantial portion of the stress waves, the failure becomes concentrated within the grout itself, considerably enhancing the deformation resistance of the rock mass. Furthermore, this reinforcement effect is progressively amplified with an increase in grout width. (2) The absolute strength degradation coefficient Rs and the absolute strength restoration coefficient Rx were defined. It was observed that both Rs and Rx decrease linearly as fracture width increases. Similarly, the dynamic compressive strength exhibits a linear decline with increasing fracture width, while the peak strain demonstrates a linear upward trend. Grouting significantly enhances the dynamic compressive strength of fractured rock masses and effectively suppresses their peak strain. (3) An increase in fracture width results in a rise in the energy reflection coefficient and a decline in the transmission coefficient. The energy dissipation ratio exhibits a non-monotonic trend—initially increasing and then decreasing—reaching its maximum at a critical width of 5.83 mm. After grouting, the curves for transmitted and reflected energy tend to stabilize, indicating improved energy transmission efficiency. The grout substantially optimizes the energy absorption efficiency of the rock mass, and the dissipated energy increases monotonically with fracture width. (4) Calculated stress intensity factors increase with fracture width but decrease post-grouting. The dynamic constitutive model, which incorporates strain equivalence, Weibull distribution, and the TCK model, demonstrates good agreement with experimental curves.

Key words： rock mechanics fractured sandstone grouting reinforcement dynamic characteristics energy dissipation characteristics failure laws split Hopkinson pressure bar

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	WANG Zhide1
	AN Jiaxing1
	YANG Senlin1
	CHEN Cheng1*
	XIA Yuanyou1
	LIN Manqing2

Cite this article:

WANG Zhide1,AN Jiaxing1,YANG Senlin1, et al. Failure mechanism, dynamic characteristics and fracture damage model of grouting reinforced fissured sandstone[J]. , 2026, 45(10): 2984-2998.

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2026.0004 OR https://rockmech.whrsm.ac.cn/EN/Y2026/V45/I10/2984

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