Engineering application of Modified Epoxy Resin Grouting in the High-Pressure Waterway at Meizhou Pumped Storage Power Station

GUO Kai; SUN Zheng; ZHENG Jing-xing; YING Peng-tao; HUANG He-cheng; SHAO Xiao-mei

doi:10.11988/ckyyb.20260635

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Journal of Changjiang River Scientific Research Institute ›› 0 DOI: 10.11988/ckyyb.20260635

Engineering application of Modified Epoxy Resin Grouting in the High-Pressure Waterway at Meizhou Pumped Storage Power Station

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Abstract

The Meizhou pumped storage power station featured a high-pressure water conveyance system with a maximum static head of 500 m, designed with reinforced concrete lining. The site contained unfavorable geological conditions such as diorite veins and fault fracture zones in localized areas, making conventional cement grouting insufficient to meet impermeability requirements. To overcome technical challenges associated with epoxy grouting materials, such as premature polymerization above 35°C, the conflict between low viscosity and high strength, and mismatched setting time with grouting stages, these issues were addressed through modifier optimization of curing agents, modification of the epoxy base resin, and mix proportion refinement. As a result, a specially modified epoxy grouting material tailored for high-head hydropower tunnels was developed. Through on-site production trials, differentiated grouting parameters were established for rock vein sections in the upper horizontal intake tunnel, fault zones in the lower horizontal intake tunnel, and fault zones in the tailrace branch tunnel. Post-grouting inspection showed permeability rates below 1.0 Lu across all test boreholes, with an increase in ultrasonic wave velocity ranging from 4.2%~7.6%. The second-phase high-pressure waterway of the Meizhou Pumped Storage Power Station successfully filled with water after composite grouting, and the surrounding rock remained stable during operation with no abnormalities detected in monitoring. This technology provides valuable reference for chemical grouting treatments of adverse geological formations in similar high-head pumped storage projects.

Key words

epoxy resin grouting / high-pressure waterway / reinforced concrete lining / seepage control and reinforcement of surrounding rock / engineering application

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GUO Kai , SUN Zheng , ZHENG Jing-xing , et al . Engineering application of Modified Epoxy Resin Grouting in the High-Pressure Waterway at Meizhou Pumped Storage Power Station[J]. Journal of Changjiang River Scientific Research Institute. 0 https://doi.org/10.11988/ckyyb.20260635

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