A Method of Using Roof Caving Swelling Filling and Directional Drilling Point Source Interval Grouting to Reduce Damage

Abstract

The invention discloses a method of grouting damage reduction using roof collapse and bulge filling and directional drilling point source type interval grouting; after coal mining operations, the roof naturally collapses to form a state of complete filling or nearly complete filling. First, the interval grouting method is adopted. Downhole directional drilling to the upper part of the caving broken body, and simultaneous laying of PVC casing and grouting pipe to realize fixed-point grouting; among them, the performance of the grouting material is selected with reference to relevant national standards and the targeted mix design is selected to select the appropriate quick-setting Precisely control the initial setting time of the grout; then, by laying out a grouting flow meter and a grouting pressure gauge on the grouting pipeline, the accurate and real-time monitoring of the grouting amount is realized, and the spiral nozzle is used for planar jet grouting. The amount and speed of grouting are determined by controlling the pressure of the grouting pipe and monitoring the flow rate, and finally form a point-source interval grouting pile layout scheme.

Description

technical field [0001] The invention relates to the technical field of coal mine mining, in particular to a method for reducing damage by using roof collapse and swell filling and directional drilling point-source interval grouting. 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 str...

AI Technical Summary

Problems solved by technology

However, the mining method of retaining coal pillars causes waste of resources and reduces the service life of the mine on the one hand; on the other hand, it affects the production layout and efficient coal recovery

However, the cost of filling mining is too high, and the economic benefit is poor, so it is not suitable for large-scale promotion and implementation of coal mining enterprises.

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