深部巷道围岩扰动敏感区划分机制研究

doi:10.3724/1000-6915.jrme.2026.0066

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Abstract To consistently identify disturbance-sensitive zones in the surrounding rock of deep roadways under varying confining pressures and disturbance conditions, triaxial rheological disturbance tests were conducted on red sandstone specimens using the RRTS-IV system, complemented by nuclear magnetic resonance (NMR) measurements. A method for delineating disturbance-sensitive zones based on a modified failure proximity index F* was proposed by jointly considering strength attenuation, disturbance strain evolution, and pore-structure changes. The index F* incorporates both the confinement-induced strengthening effect and the disturbance-induced strength attenuation within a unified framework, thereby enabling the proximity to failure under different conditions to be compared on a common dimensionless scale. The results show that: (1) As F* increases, the disturbance strain undergoes a three-stage evolution characterized by an initial decrease, a gradual increase, and a subsequent abrupt increase. These stages correspond to the disturbance-insensitive zone (F*＜0.70), disturbance-sensitive zone (0.70 ≤ F*＜0.80), and disturbance-sensitive failure zone (F*≥0.80), respectively. (2) The post-disturbance failure stress decreases exponentially with the number of disturbances. The fitted disturbance-sensitivity coefficient ? decreases with increasing confining pressure, indicating that confining pressure suppresses disturbance-induced damage. (3) Under different confining pressures and disturbance levels, the minimum and abrupt-change points of the disturbance strain remain stable in F* space and are concentrated near F* ≈ 0.70 and F* ≈ 0.80, respectively. (4) Porosity measurements and NMR images show that fine pores dominate when F*＜0.70; medium-sized pores gradually develop when 0.70≤F*＜0.80; and relatively large pores and interconnected fractures develop rapidly when F*≥0.80, accompanied by an abrupt increase in porosity. This microstructural evolution is consistent with the three-stage evolution of the disturbance strain. The proposed F*-based method integrates the effects of confining pressure, disturbance accumulation, and proximity to failure into a unified dimensionless measure, providing a basis for disturbance-risk assessment and the selection of zone-specific support parameters in deep roadways.

Key words： mining engineering surrounding rock of deep roadways rheological disturbance disturbance-sensitive zone modified failure proximity index disturbance strain

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	WANG Bo1*
	YU Kexiang1
	JI Bo1
	GAO Xiangyu1
	SUN Hongxu1
	WANG Hanpeng2
	WANG Jun3
	HUANG Wanpeng4

Cite this article:

WANG Bo1*,YU Kexiang1,JI Bo1, et al. Mechanism of disturbance-sensitive zone delineation in deep roadway surrounding rock[J]. , 2026, 45(11): 3236-3253.

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2026.0066 OR https://rockmech.whrsm.ac.cn/EN/Y2026/V45/I11/3236

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