黏度时变性注浆材料流动特性与应用研究

Study on flow characteristics and application of viscosity time-varying grouting material

浆液的流动性对于浆液的扩散与运移具有重要的影响。通过开展黏度时变性注浆材料流动性正交试验,并选择不同可泵时间黏度时变性浆液进行流动度测试,分析了水灰比、外掺剂对浆液流动性能的影响规律,揭示了黏度时变性浆液流动度时间变化特征,从外掺剂对浆液水化硬化影响基础上,对浆液的流动变化机制性进行了探讨,并以碎裂岩体注浆为例,研究浆液流动性在注浆中的应用。研究结果表明:对于浆液的流动度的影响,随着水灰比、助剂1~#、助剂2~#、助剂3~#量的增加,浆液的流动度增加,水灰比是影响流动度的最大的因素,其次为助剂2~#、助剂3~#、助剂1~#;对于浆液黏度的影响主次关系为助剂3~#、助剂1~#、水灰比、助剂2~#;浆液流动度的变化具有缓慢期、快速期、稳定期3阶段特征,浆液临近可泵时间时,浆液流动度变化具有显著的突变性。碎裂岩体注浆应用结果表明:运用浆液的黏度时变特性进行注浆,减少了普通水泥浆待凝、复灌所带来的工时延长,缩短了注浆时间,节省注浆材料。

Slurry liquidity has an important influence for grout diffusion and migration. By conducting orthogonal liquidity test on viscosity-varying grouting materials with different pumping time, the influence of water cement ratio and the additive agent on the properties of slurry flow are analyzed. Flow degree of time variation characteristics of the viscosity time-varying slurry are investigated. The changes of the flow of the slurry machine rational are discussed considering the effects of the additive agent on slurry hydration and hardening. Slurry liquidity in the application of grouting in cataclastic rock is studied. The results show that while increasing the amount of water cement ratio, additive #1, additive #2, additive #3, the flow of the slurry augmented. Water cement ratio is the most significant influence factor of fluidity, followed by additive #2, additive #3, additive #1. For the main factors of the influence on slurry viscosity followed by additive #3, additive #1, water cement ratio and additive #2. Slurry fluidity change presents three-stage development： slow increase, fast increase, and stable state. When nearing slurry pump time, slurry flow has significant change respectively. Grouting application in cataclastic rock mass shows that the use of grouting slurry considering time-varying viscosity can reduce refilling time for the ordinary cement slurry, shorten the grouting time, save the grouting material.