(1 Institute Key Laboratory of Geotechnical Mechanics and Engineering of the Ministry of Water Resources，Changjiang River Scientific Research，Wuhan，Hubei 430010，China；2. SINOPEC Anqing Branch，Anqing，Anhui 246513，China；
3. China Anneng First Engineering Group Co.，Ltd.，Hefei，Anhui 230000，China)
Abstract：At present，the design value of the grouting engineering quantity for large-scale water-sealed caverns in China is mainly determined by referring to the storage capacity(or investment scale) and in the light of the actual grouting amount of the already constructed projects. The lack of consideration of the differences in geological conditions among different projects resulted in a multiple-fold discrepancy between the actual and the designed grouting amount of most projects，and brought out negative impacts on the control of project investment，duration，and quality. The length of grouting tunnel，the amount of grouting cement taken，and the total length of grouting sections are the main indexes to characterize the amount of grouting works. To explore a method to improve the estimation accuracy of the amount of grouting works，hydrogeological test of 57 boreholes with a total of 852 sections during investigation phase，the grouting information of a construction tunnel with the length of 3 200 m in construction phase，and the grouting data of 384 grouting boreholes have been collected in this study. By comparing and analyzing the proportion of borehole sections with over-standard permeability and the proportion of tunnel sections those need grouting during the construction phase，a method for estimating grouting tunnel length is proposed. Drawing on the practical experience garnered from lots of such cavern projects，a method for estimating the total length of grouting sections corresponding to different excavation types of caverns is summarized. Through establishing the correlation between the cement consumption and the permeability before grouting，a method for estimating the cement consumption of the project is put forward. The established grouting engineering quantity estimation method system above，that takes the engineering scale，the geological characteristics and the excavation type into account，not only contributes to standardizing the grouting works in water-sealed cavern projects，but also possesses reference significance for grouting in other types of underground rock engineering.
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2025, Vol. 44 
