井下上仰钻孔突水分段注浆堵水方法研究
Study on sectional grouting and sealing method of upward water inrush hole in underground mine
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摘要: 为了封堵塔然高勒煤矿FS5-1钻孔突水,同时防止在注浆过程中,引起钻场及周围涌水巷道顶板的下沉和破坏,通过采用孔内分段注浆堵水方法,在孔内初始出水位置24.2 m处安设环状橡胶止浆塞,将孔内出水分为上、下2段,并在止浆塞内环处设Φ63.5 mm×8.0 mm的泄压钢管。在通过泄压钢管充分导水泄压的同时,对钻孔下段及周围巷道顶板的出水通道进行低压注浆,然后利用泄压管对上段钻孔及含水层进行高压注浆,成功封堵了钻孔突水。研究结果表明:通过在上仰孔内初始出水位置用钻机布设泄压钢管、并在钢管端部设置环状橡胶止浆塞的方法,可以有效地将孔内注浆分为2段,在泄压时的低压力注浆不仅可以达到预期注浆效果,而且能保证出水巷道顶板的安全,对顶板破碎时钻孔突水具有很好的治理效果,另外,该方法也可用于孔口管未固结或固结失效时,意外出水情况下的固管或堵水方案。Abstract: 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.
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Keywords:
- water inrush hole /
- sectional grouting /
- high pressure water /
- packer in hole
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