一种负压辅助注浆方法及其扩散规律研究

doi:10.3724/1000-6915.jrme.2025.0025

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Abstract To address the issue of potential secondary damage to the original rock mass caused by increased grouting pressure in traditional grouting methods, a negative-pressure-assisted grouting technique for reinforcing micro-fractures is proposed. This method, building upon conventional grouting practices, involves applying negative pressure to micro-fractures or distant ends, thereby increasing the pressure differential between the grouting end and the fracture end without raising the grouting pressure itself. This approach accelerates the grout flow rate and enhances the efficiency of grouting reinforcement. The research established planar and two-dimensional models and constructed a negative-pressure-assisted grouting experimental system. Additionally, numerical simulations were conducted using COMSOL Multiphysics software to investigate the mechanisms of grout diffusion and the dynamic response characteristics of internal pressure by comparing experimental results with simulation data. The findings indicate that applying negative pressure at specific locations results in a pressure reduction at those sites, thereby creating an enhanced pressure differential between the grouting end and the negative-pressure application end. This drives the rapid and efficient movement of grout towards the negatively pressured area, significantly accelerating the filling speed of grout within complex fracture networks and effectively expanding the filling range. Furthermore, it was discovered that maintaining a ratio of grouting pressure to negative pressure between 1:1 and 3:1 can effectively enlarge the grout diffusion range during injection. This strategy broadens the diffusion range of the grout throughout the grouting process, thereby further improving the effectiveness and quality of grouting. The study of negative-pressure-assisted technology in enhancing grout diffusion effectiveness will provide novel ideas and methods for grouting reinforcement in fractured rock masses.

Key words： rock mechanics cracks negative pressure assistance grouting slurry spread water-cement ratio COMSOL

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	Articles by authors
	LU Haifeng1
	2
	HE Zeao1
	ZHANG Kai1
	MA Mingtian1

Cite this article:

LU Haifeng1,2,HE Zeao1, et al. A negative pressure assisted grouting method and its diffusion patterns[J]. , 2025, 44(8): 1988-2006.

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https://rockmech.whrsm.ac.cn/EN/10.3724/1000-6915.jrme.2025.0025 OR https://rockmech.whrsm.ac.cn/EN/Y2025/V44/I8/1988

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