A method of grouting and water plugging in vertically fractured strata with large dip angle

Abstract

The invention provides a grouting and water blocking method for a large inclined angle vertical fracture formation. The grouting and water blocking method is applied to construction of a coal mine vertical shaft and comprises the steps of defining of a working face, construction of a grout stop pad, back-filled grouting, working face pre-grouting and the like. The grouting and water blocking method combines the back-filled grouting with the working face pre-grouting, the back-filled grouting is performed before thee working face pre-grouting, a water sealing ring is constructed, and the grouting effect is strengthened; the working face pre-grouting construction is performed on the grout stop pad, the thickness of the grout stop pad is subjected to scientific calculation, grouting reinforcement is performed on the grout stop pad, the final grouting pressure can reach 12Mpa, the grouting diffusion radius is increased, and the grouting effect is enhanced; and the back-filled grouting andthe working face pre-grouting are combined, large inclined angle cracks developed in the direction of a wellbore are pre-grouted and plugged and reinforced to shield wellbore excavation and construction, and safe construction conditions are created.

Description

technical field [0001] The invention relates to the construction field of auxiliary vertical shafts in coal mines, in particular to a method for grouting and water blocking in vertically fractured formations with large dip angles. Background technique [0002] Grouting is to inject grout into the pores, cracks or cavities of rock and soil, and spread, solidify, and harden in it. The hardened grout can reduce the permeability of rock and soil, increase its strength and stability, and achieve rock and soil reinforcement. and water blocking purposes. It can not only be used for "dry well drilling" construction in order to reduce water gushing in the wellbore, speed up the drilling speed, and pre-grout all aquifers within the full depth of the wellbore, but also block water in fractured water-bearing strata and loose sandy soil layers. reinforcement. Grouting is one of the main methods of sinking wells and water control in mine construction, and it is also an important means o...

AI Technical Summary

Problems solved by technology

[0005] Analyzing the above-mentioned advance pre-grouting method on the working face, this method does not scientifically calculate the thickness of the grout pad, and cannot achieve the expected effect. It cannot make the final pressure of grouting reach 12Mpa. It is necessary to set up a water filter layer, the process is cumbersome, and the cost is high. In view of the shortcomings of the existing technology, there is an urgent need for a grouting method for vertical fractures with a large dip angle to optimize the existing grouting measures.

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