THE STATE-OF-THE-ART OF CHEMICAL GROUTING TREATMENT FOR QUICKSAND HAZARDS IN COAL MINES AND THE PROSPECT OF SEVERAL KEY PROBLEMS

The chemical grouting is one of effective methods to treat mine quicksand in difficult grouting strata with low grouting pressure. The research ideas and key questions are proposed in this paper, they are as follows: simulation tests, in-situ monitoring and theoretical analysis will be adopted to study the characteristics of the field of seepage, chemistry and temperature in the coupled action between grouts and quicksand during the treatment of the quicksand hazards. The engineering geological model is established for the cause and treatment to realize the mechanism of fracture, spreading and seepage grouting of chemical grouts in various water-bearing sand layers with different engineering geological behaviors. The modern transducer and information collection techniques can be used in the monitoring of grout pressure, grout volume and grout spreading in whole cause of grouting. The micro mechanism of grout spreading will be studied and micro inspects method for grouting effect will be developed. The research will lay a foundation for prediction and treatment of the serious accident of mine quicksand.