Xin'anjiang Dam Dam Foundation Shale Evolution And Chemical Grouting Research And Applications

Based on research actuality and development for domestic and overseas of chemical grouting technology, the problem that the low cleavage stratum consolidation of argillaceous interlayer at the dam site of Xinanjiang hydropower plant is proposed. The basic theories including two phase seepage theory, Imbibition theory, wettability rollback theory and intensity increase mechanism of grouted media are introduced. From mineral component, chemistry component, structural character and seepage trend of dam site, shale argillaceous mechanics and evolvement trend at the dam site of Xinanjiang hydropower plant are analyzed. The inclusion that Shale intenerate and argillaceous trend is slowness increasing is got. Base on the geological condition in situ and indoor simulation test, the material including AK, grouting cement and ZHK-798 is chose and optimized. Construction technics fits to "lower grouting pressure" composite grouting techics. The grouting of lower penetrate layer is enhanced.The technologies including bore, grouting data analysis, physical mechanics test, geology CT scan, electron microscopical scan, energy chart analysis are used to evaluate chemical effect. The conclusion including: (1) the effect that grouting liquid fills in shale joints proves good penetrate. (2) the geology CT test results shows that the wave velocity increases 6% at the site of dam after grouting. (3) the drill bore shows that the mechanics index of bore is gained increasing and satisfies engineering requiring. Contrasting to others engineering, the test adopts to the AK grouting liquid instead of cement grouting liquid. It overcomes poor grouting of cement and non- affinity of chemical grouting liquid.