破裂煤岩体注浆加固试验方法及重塑机理研究

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中图分类号：TD324 文献标志码：A

DOI：10.13272/j.issn.1671-251x.2025040092

Abstract：Grouting reinforcement technology for fractured coal and rock masses is characterized by high concealment，complex procedures，andhighconstructioncosts.Itisrelativelydifficult todesign grouting schemes and study the grouting reinforcement mechanism through in-situ underground experiments.At present， there are few studies focusing on thedesign of grouting schemes，and the grouting reformation mechanism has not been fully revealed.To addressthese isues，a grouting reinforcement test system applicable in laboratory settings was developed for fractured coaland rock masss.Specimens of fractured gypsum-based rock masses with low dispersion characteristics were prepared，and the water-cement ratio of the cement slurry wasused as the experimental variable.Grouting reinforcement tests under diffrent water-cement ratios were carried out in the laboratoryusing theconstructed system，and the groutingreformation mechanismwasrevealed.Theresults showed that： ① after grouting and reformation， the peak stress of the fractured gypsum-based specimens ranged from 3.64 to 5.21MPa ， indicating that their bearing capacity was effectively improved compared to the initial average residual stress of 3.11MPa ② With the increase in the water-cement ratio， the viscosity and flowability of the cement slurry continuously improved. Even fractures with a width of approximately 0.1mm were effectively filled under high water-cement ratios.The structural framework effect of the reformed specimens continued to strengthen. When the water-cement ratio increased from 1.00 to 1.50，the average peak stress of the grouted and reformed specimens rose from 3.79MPa to 5.09MPa ，representing an increase of 34.30% ③ Within a certain range，slurry with a high water-cement ratio significantly enhanced the integrity and mechanical properties of the fractured rock mass.This clarified that the essence of grouting reinforcement lay in the fillig of fractures by the slurry and the formation of the structural framework effect.

Key words： fractured surrounding rock; grouting reinforcement; fractured gypsum-based specimen; grouting reformation mechanism; water-cement ratio; fracture filling; structural framework effect

0引言

煤炭作为国家能源结构中的绝对主体，是保障国家能源安全的“压舱石”和“稳定器”[1-2]。（剩余9813字）