Development of large-scale simulation experiment system for dynamic water rapid sealing in flowing water roadway

During the emergency rescue period of water inrush disaster in coal mine,the textile capsule borehole-controlled grouting can solve some common problems,such as large quantities of work amount,long work project delay and secondary disaster during dynamic water sealing in flowing water roadway. In order to further study the mechanism of dynamic water rapid sealing in flowing water roadway and provide a kind of experimental technology for emergency rescue,based on the established hydraulic model and the successful case analysis on the dynamic water rapid sealing in flowing water roadway,this paper has developed a conceptual model and a large-scale simulation experiment system for dynamic water rapid sealing in flowing water roadway. The experiment system consists of four functional systems and six equipment systems. The four functional system are the betting system of textile capsule and slurry,the dynamic system of water supply and slurry supply,the system of initial condition and boundary condition,and the monitoring system. The six equipment systems are the large-scale roadway simulation experiment cabin,the dynamic water simulation system,the controlled grouting system,the steady pressure and flow system,the safety shunt system,and the image data acquisition and processing system. Through the strength checking calculation of the experiment cabin,a group of monitoring experiments of the steady pressure and flow system and a group of textile capsule throwing experiments,the results show that the experiment system can form the initial condition of constant dynamic water pressure and flow and the boundary condition of dynamically changing dynamic water pressure difference and flow attenuation,which meets the requirements of water blocking environment of dynamic water rapid sealing. It can be used in the simulation experiment of rapid sealing of a roadway with 5 m wide,4 m high and 2 000 m3/ h flowing water under the condition of different mine submerged water level and different water source level of water inrush,and the maximum water source level of water inrush can reach 5 MPa. The results of textile capsule throwing experiments also show that the textile capsule falls off to the roadway in advance under the condition of not full of slurry. Although a single textile capsule does not move and can greatly reduce the cross-section area of the roadway,it is difficult to reduce the water inrush volume of the roadway. It must be further blocked by the supplementary grouting outside the textile capsule in the later stage to achieve the success of dynamic water rapid sealing,which needs a further study.