Study on sectional grouting and sealing method of upward water inrush hole in underground mine

In order to seal FS5-1 water inrush hole in Taran Gaole Mine and also prevent the subsidence and failure of the roofs in the drilling site and the surrounding water inrush gateway occurred in the grouting process,with the sectional grouting and water sealing method in the hole applied,an annular rubber packer was set 24.2 m location of the initial water inrush level in the hole. Thus the water in the hole was divided into upper and low sectional sections and there was an ø63.5 mm×8.0 mm pressure released steel pipe set in the internal ring of the packer. When full water drainage and pressure releasing made with the water released steel pipe,a low pressure grouting was conducted in the low section of the hole and the water drainage channel in the roof of the mine gateway. Then the pressure released pipe was applied to the high pressure grouting in the upper section of the hole and the water bearing strata and the water inrush hole was successfully sealed. The study results showed that the pressure released steel pipe was set at the initial water inrush location in the hole with the drilling rig. A method to set an annular rubber packer at the end of the steel pipe could effectively divide the grouting in the hole into two sections. During the pressure releasing,a low pressure grouting would not only reach the predicted grouting effect and could ensure the safety roof of the water inrush gateway. Therefore when the roof was broken,a good control effect of the water inrush hole would be in the water inrush hole. Meanwhile,the method could be applied to unconsolidate the pipe or the consolidation was failure and to consolidate the pipe or the water sealing under the condition of the water inrush.