采空区破碎岩体负压注浆加固试验研究与机制分析

doi:10.13722/j.cnki.jrme.2022.0630

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Abstract Grouting is not only an effective method to address the high stresses and large deformations of surrounding rock in deep mining，but is also a key technology for green and low-carbon mining. Accordingly，this study conducted uniaxial compression tests on grouting reinforcement with different negative pressure pressures to explore the reinforcement effect of negative pressure grouting. It analyzed the effects of slurry flow effect of porous media on the mechanical properties of grouting and solid. Moreover，we investigated the relations of the physical parameters，specimen?s strength，deformation in different samples under different negative pressures and examined the sample failure modes drawing the following conclusions based on the present compression test results. First，the effect of the four forces on the negative pressure grouting results in the reinforcement mechanical properties being affected by four factors as the actual situation of the broken rock mass differs from the theory. Secondly，as the negative pressure is increased，a triple change in the water-cement ratio，porosity，and doping of the specimen occurs. The density of the specimen shows a trend of first increasing and then decreasing，exhibiting a three-stage character，with the porosity of the specimen continuing to decrease. Thirdly，the stress-strain curve of the specimen reinforced by negative pressure grouting shows four stages of change of which the strength and elastic modulus of the specimen showed a trend of first a rise and then a decrease，while the mean curve of the axial strain shows a first decrease and then a rise. It can be determined that the negative pressure of 60 kPa is the threshold value of negative pressure grouting reinforcement. Then，the difference between negative pressure grouting pressure makes the internal structure of the specimen different，and finally shows three types of failure modes. Finally，the negative pressure grouting process is affected by four factors. It is necessary to take into account not only the hydration reaction of the slurry，but also the characteristics of the liquid bridge at the solid-liquid interface，and at the same time the pore changes and vacuum dehydration effects during the grouting process. The results are of great reference to improve the grouting reinforcement process and provide a theoretical and experimental basis for clean，efficient and stable coal mining.

Key words： mining engineering grouting reinforcement negative pressure grouting broken rock mass hydration reaction vacuum dehydration

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	Articles by authors
	LYU Xin1
	YANG Ke2
	FANG Juejing1
	DUAN Minke1
	2
	WANG Yu1
	ZHANG Zhainan1

Cite this article:

LYU Xin1,YANG Ke2,FANG Juejing1, et al. Experimental study and mechanism analysis of negative pressure grouting reinforcement for broken rock mass in goaf[J]. , 2023, 42(S2): 4174-4188.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0630 OR http://rockmech.whrsm.ac.cn/EN/Y2023/V42/IS2/4174

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