扩张岩溶裂隙的注盐酸试验研究

针对岩溶裂隙微小时含水层注浆困难的现状,开展了室内和现场的酸溶试验研究,以扩张岩溶裂隙宽度。研究表明,注盐酸的前10 min,盐酸与灰岩的反应最为剧烈且变化很快,到40 min以后反应基本稳定;盐酸浓度在20%左右与石灰岩岩芯反应效果最好;现场钻孔注酸后,钻孔涌水量显著增加,相对增加值在26.4%~133.3%之间。有关研究成果为提高岩溶微裂隙注浆量提供了理论保证。

Experimental Study of Acid Dissolving to Expand Karst Fissure

With the aim to overcome the difficulty of grouting into aquiferous stratum in which karst fissure is weeny,both the home and field experiment of acid dissolving to expand karst fissure were carried out.The experiments indicated that the reaction between hydrochloric acid and limestone was active and changed rapidly in the initial 10 minutes and the reaction became steady at 40 minute after the inpouring of hydrochloric acid into limestone;when the concentration of hydrochloric acid was 20% around the effect of reaction was the best;after the inpouring of hydrochloric acid into limestone by borehole the water discharge of borehole increased markedly,and the relative increment of water discharge of borehole was between 26.4% and 133.3%.It offers theoretic foundation to increase the grouting amount of aquiferous stratum.