Shoelace threading cap type overlying strata separation layer grouting settlement reduction method

Abstract

The invention relates to a shoelace-penetrating cap type overlying strata separation layer grouting subsidence reduction method, which is characterized in that three layers of grouting layers are designed, and comprise a main grouting layer positioned near 120 m of the upper part of a coal seam, a bottom plate grouting layer in a bottom plate rock layer of the coal seam and a secondary grouting layer arranged below a main key layer. The grouting drilling open hole section is constructed to a coal seam roof rock stratum, an intermediate casing pipe is arranged in the grouting drilling open hole section, and a grout stopping device is arranged outside the intermediate casing pipe; grouting is conducted on the main grouting layer through the grouting drilling space outside the intermediate casing; in the lagging working face, grouting is conducted on the bottom plate grouting layer through an inner cavity of the technical casing, and holes are drilled for grouting and shoe wearing is conducted; perforation is carried out at the position, located at the secondary grouting layer, of the technical casing, grouting is carried out on the secondary grouting layer through an inner cavity of the technical casing and a grouting drilling space outside the inner cavity of the technical casing, and capping is carried out on a grouting drilling hole; at the moment, the grouting drill hole is a supporting pile comprising a casing pipe, the supporting strength on a key layer can be improved, the delayed sinking phenomenon possibly generated after the implementation of the separation layer grouting sinking reduction technology is avoided, and effective control over surface collapse is achieved.

Description

technical field [0001] The invention relates to the field of coal mine filling and mining, in particular to a method for grouting and subsidence reduction of overlying rock-separated layers with shoelaces on. Background technique [0002] Overlying rock separation layer grouting is a commonly used filling and settlement reduction mining method in coal mines. It constructs grouting drilling on the ground facing the working face, and injects filling materials into the separation layer of the overlying rock during the mining of the working face. It has the functions of filling and coal mining. Small interference, high filling efficiency, low filling cost and other advantages. However, it also has shortcomings. First, it does not consider the problem of overlying rock and surface lagging subsidence, the grouting duration is relatively short, and the injection-production ratio is low; Stable support structure. Contents of the invention [0003] Aiming at the deficiencies in t...

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Problems solved by technology

However, it also has shortcomings. First, it does not consider the problem of overlying rock and surface lagging subsidence, the grouting duration is relatively short, and the injection-production ratio is low; stable support structure

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