Method using surface orientation bedding drilling grouting to reinforce laminar limestone

Abstract

The invention discloses a method using surface orientation bedding drilling grouting to reinforce laminar limestone. The method includes: performing surface drilling until a suspected water outlet point is reached, performing drilling grouting, wherein drilled holes include a main hole and branch holes, the main hole is provided with a straight hole section and an oriented bedding section, an oriented slanting-guide section is further arranged between the straight hole section and the oriented bedding section, and the branch holes include primary branch holes and secondary branch holes; a water-bearing stratum is modified through the drilling grouting, grouting pressure is 1.5-3.5 times of the hydrostatic pressure of a to-be-grouted point, grouting termination pressure is 3.5-4 times of the hydrostatic pressure, and the lime-cement-flyash water-bearing stratum is transformed into a water-resisting layer to resist lime, cement and flyash and water of the water-bearing stratum below the lime, cement and flyash. By the method, hidden water guide channels are blocked, a base Ordovician limestone karst powerful water source is blocked, and safety of deep exploitation is guaranteed.

Description

technical field [0001] The invention belongs to the field of coal mining, and more specifically, the invention relates to a method for ground directional drilling and grouting to strengthen thin-bed limestone. Background technique [0002] In the process of coal mining, because the vertical strong water conduction channel communicates the Austrian ash water with the thin limestone water in the upper part of Taihui, a large water inrush accident occurs on the floor of the fully mechanized mining face. The vertical strong water conduction channel includes geological structures such as faults and collapsed columns. The characteristics of this geological structure can be summarized as follows: thin-layer limestone-vertical concealed water-conducting structure-basement ash rich in water; the existing treatment method is mainly to use conventional downhole drilling and grouting to the underlying Carboniferous Taiyuan However, the underground grouting construction is difficult and ...

AI Technical Summary

Problems solved by technology

[0002] In the process of coal mining, because the vertical strong water conduction channel communicates the Austrian ash water with the thin limestone water in the upper part of Taihui, a large water inrush accident occurs on the floor of the fully mechanized mining face. The vertical strong water conduction channel includes geological structures such as faults and collapsed columns. The characteristics of this geological structure can be summarized as follows: thin-layer limestone-vertical concealed water-conducting structure-basement ash rich in water; the existing treatment method is mainly to use conventional downhole drilling and grouting to the underlying Carboniferous Taiyuan However, the underground grouting construction is difficult and inefficient. After the treatment, the water under the floor can be prevented from gushing out in a short time. As the mining depth deepens, water inrush accidents from the floor will still occur in the fully mechanized mining face. It is difficult to cure, and even in the process of deep mining, there will be repeated water inrush and accidents, and the ground drilling to control the Austrian ash aquifer due to the deep buried depth of the Austrian ash, the cost of water prevention and control is high, and the thickness of the Austrian ash is large. Relatively low, when the mining depth of the mine is increasing and the water pressure is increasing, it is very easy to have a large mine water inrush accident involving the participation of Austrian ash water, causing mine disasters and heavy losses

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