Grouting modification and surrounding rock control technology for water-rich sandy layer at large section inclines
To study the grouting modification and surrounding rock control technology for water-rich sandy strata at large section inclines,we took an in-site investigation at the main incline of Caojiatan Coal Mine.Based on numerical simulation analysis on the effects of sandy layer water burst and wall rock control of original or grouting with ordinary silicate cement,cement-water glass,and SJP grouting materials,we put forward a rational wall rock control plan for sandy strata.Research results show that the deformation,plastic zone,and water permeability of roadways have greatly reduced with grouting.The SJP grouting materials have better wall rock controllability and impermeability than that with common silicate cement and cement-water glass grouting materials.By spraying concrete and setting up U-shaped steel sheds,the deformation of the surrounding rocks in sandy layers at the incline can be efficiently controlled.The application results at this incline showed that after using SJP grouting modification,the water burst rate in the sandy layers of an incline will reduce from 27 m3/h to 17 m3/h.The opening with grouting section can bear stress well and keep a stable structure.
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