Research on safety prevention and control technology of surrounding rock deformation in roadways based on jet grouting self-filling process

doi:10.16265/j.cnki.issn1003-3033.2025.S1.0018

Abstract

Abstract:

To effectively control the instability and deformation of surrounding rock in coal mine roadways and ensure safe production, research on the application of jet grouting self-filling technology was conducted. First, through theoretical analysis, laboratory tests, and field trials, the strength adaptability and failure characteristics of this technology were analyzed, and the basic composition ratio of the grouting material was determined. Then, based on microscopic structure observation and mechanical performance testing, the mechanism by which it controls surrounding rock deformation was revealed. It was found that the compressive strength of the jet grouting self-filling samples was mainly influenced by the water-to-binder ratio and microscopic features. The water-to-binder ratio affected the strength by regulating the compactness of hydration products and the crystal morphology of ettringite. Finally, according to the actual displacement characteristics of the surrounding rock in roadways, an optimized plan for combined jet grouting and support was proposed, and a ″jet grouting-grouting injection-support″ collaborative control technology system was established, followed by on-site industrial trials. The research shows that the optimal grouting material ratio is 65% solid mass fraction and a water-to-binder ratio of 0.6. Under this ratio, the 28-day compressive strength of the samples meets the design requirements, and the microscopic structure shows good compatibility between the cement matrix and fly ash particles. On-site application results in an 11% reduction in the deformation of both roadway slopes, and the stress distribution of the surrounding rock tends to stabilize, validating the effectiveness of this technology in controlling surrounding rock deformation.

Key words: jet grouting, self-filling, stability of surrounding rock, rock deformation, grouting material, microstructure

CLC Number:

X936

CHEN Kai, YU Mingsheng, LIU Long, WANG Shuai, ZHANG Zilong, WU Pengfei, ZHANG Haoran. Research on safety prevention and control technology of surrounding rock deformation in roadways based on jet grouting self-filling process[J]. China Safety Science Journal, 2025, 35(S1): 114-121.

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物质 w_t/%	CaO	SiO₂	Al₂O₃	Fe₂O₃	SO₃	MgO	其他氧化物	灼烧损失	表观密度/ (g·cm^-3)	比表面积/ (m²·kg^-1)
水泥	62.80	20.60	4.13	2.99	2.56	1.93	3.93	1.06	3.10	338
尾砂	7.31	47.56	7.12	24.65	—	5.42	7.13	0.81	2.67	55
飞灰	4.19	58.76	11.66	4.50	1.28	3.24	9.48	6.89	2.46	498

样品编号	固体质量分数/%	水胶比	水/g	水泥/ g	尾砂/ g	飞灰/ g
S65W6	65	0.6	1 200	1 200	229	800
S65W7	65	0.7	1 200	1 028	515	686
S65W8	65	0.8	1 200	900	729	600
S65W9	65	0.9	1 200	800	896	533
S75W6	75	0.6	1 200	1 200	1 600	800
S75W7	75	0.7	1 200	1 028	1 886	686
S75W8	75	0.8	1 200	900	2 100	600
S75W9	75	0.9	1 200	800	2 267	533