摘要
在不同水流流速条件下,对单一裂隙动水化学注浆浆液扩散规律和注浆堵水效果进行了一系列试验。结果表明,水流流速越大,浆液沿逆水流方向和垂直水流方向的扩散距离、固结体面积和堵水率越小,堵水效果越差;水流流速对逆水流方向扩散距离的影响程度大于对垂直水流方向扩散距离的影响程度。采用理论模型计算了水流流速对浆液沿水流方向和逆水流方向扩散的影响,表明水流速度对逆水流扩散距离影响大,逆水流扩散距离随流速增大降低明显。在动水条件下,为了获得好的注浆效果,注浆孔布置应考虑水流流速的影响,在水流速率大时要减小注浆孔的间距。
Presented a series of scaled model tests to investigate the influence of water flow velocity on grout propagation and sealing-off effect of chemical grouting into a fracture with flowing water.The results indicate that the grout penetration lengths in countercurrent direction and perpendicular direction to water flow,the stabilized volume,and the water sealing-off rate decrease with increasing water flow rate.The velocity of water flow has more influence on the penetration length in the countercurrent direction than in the perpendicular direction.A theoretical model was used to calculate the penetration lengths in both upstream and downstream side with varying water flow rate.The calculations show that the velocity of water flow has a more significant influence on grout propagation in the upstream side than in other directions,i.e.the penetration length in the upstream side decreases more obviously with increasing water flow rate.Therefore,the influence of groundwater flow velocity should be taken into consideration in grouting in order to reach satisfactory effect.The spacing between grouting boreholes should be reduced with increasing groundwater flow rate.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2011年第3期403-406,共4页
Journal of China Coal Society
基金
国家自然科学基金资助项目(40772192,41072237)
深部岩土力学与地下工程国家重点实验室开放基金资助项目(SKLGDUEK0903)
关键词
裂隙
化学注浆
流速
模型试验
动水
rock fracture
chemical grouting
flow rate
scale model test
flowing water
