Research and Application of Modified Cement Grouting Materials for Gushing Water Disaster in Karst Conduit

Due to the complex and invisible of hydrogeology in karst area, underground construction often encountered gushing water disaster in engineering process, which has a significant negative impact on engineering construction. In this paper, based on the theoretical analysis, slurry performance control, indoors model experiment, engineer application, a new kind of grouting materials for plugging gushing water in karst conduit are systematically analyzed and put forward, furthermore, the plugging pattern of water inrush in karst conduit is attempt to carry out. The results show that the physical performances of cement slurry could be regulated by the dosage of xanthan on the research foundation of cement-sodium silicate slurry. Furthermore, according to the evaluation index of slurry diffusion pattern and sealing efficiency in indoor model experiment, the plugging modes of cement slurry, C-S slurry and modified binary slurry are summarized as long distance fillings, timely sealing and trapezoidal sealing respectively and the modified binary slurry possessed promising engineer application properties. Finally, the research results are successfully applied to the project of the China Resources Cement (Pingnan) limestone mine, which to a certain extent accumulates engineering experience for similar projects and promotes the development of grouting materials for controlling the water inrush damage in karst areas.