A joint method of reducing subsidence by grouting in the inner capsule bag and sealing water-conducting fissures

Abstract

The invention discloses a joint subsidence reduction method of bag grouting in a separation layer and plugging of a water-conducting fissure zone; it aims at the situation that the separation layer and the water-conducting fissure zone are obviously developed due to the large collapse of the goaf. Use the drill pipe to carry out directional drilling downhole into the separation space, use the peep mirror to observe the appearance of the separation space, and use the large diameter drill pipe to pass the bladder with the grouting pipe and the double control diversion valve through the large drill pipe Push it to the abscission space, and lift out the large-diameter drill pipe after the bladder and the dual-control diversion valve reach the predetermined position. The space between the pockets is calculated according to the volume of the separation layer and the diffusion radius of the cement slurry; the dual-control diversion grouting is used to fill the pockets with grouting, so that the spaced pockets can be filled to support the overlying strata of the separation layer. The performance ensures the sealing effect of the water-conducting fissure zone, and the grouting flow meter and the grouting pressure gauge arranged in conjunction with the grouting pipeline can realize accurate and real-time monitoring of the grouting amount and the grouting flow rate, and finally realize the grouting in the inner bag of the separation layer Sealing with water-conducting fissures.

Description

technical field [0001] The invention relates to the technical field of coal mine mining, in particular to a joint subsidence reduction method of grouting in an inner capsule bag and sealing of a water-conducting fissure zone. Background technique [0002] The status of coal as the core energy source in my country will not change in the short term, but with the increase of coal production in my country year by year, many mining damage problems have been brought about, which have a significant impact on the surface ecology and groundwater environment. Especially for the ecologically fragile area of ​​the Ordos Basin, where there is drought and little rain, water resources are scarce, and the ecological environment is fragile. The contradiction between large-scale mining of coal resources and ecological environment protection is very prominent. A large number of previous coal mining practices have shown that coal mining will change the distribution of the underground stress fie...

AI Technical Summary

Problems solved by technology

The technology is generally mature and reliable, but the construction of grouting facilities requires the modification of the surface environment, which will cause damage to the relatively fragile surface ecological environment in northern Shaanxi to a certain extent; and if the grouting facilities cannot be built due to the complex surface environment, Grouting construction will be extremely difficult and not economically beneficial

In addition, the overall economic cost of this method is relatively high, especially the method of filling the entire area of ​​the separated layer space, and the cost of grouting materials at the current stage has risen, resulting in generally high grouting costs

[0005] At present, for the method of grouting in the separation layer, at this stage, the ground is drilled down to enter the separation layer for full separation layer grouting. There is no use of downhole directional drilling to support the separation layer with spaced bag grouting, Report on combined damage reduction method of grouting plugging in post-water-conducting fissure zone

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