Method for reinforcing water-bearing stratum of floor of coal seam and protecting water-bearing stratum during reinforcement

Abstract

The invention discloses a method for reinforcing a water-bearing stratum of a floor of a coal seam and protecting the water-bearing stratum during reinforcement, which comprises the following steps: 1) geophysical prospecting coalface by using transient electromagnetism, and exploring the position of the water-bearing stratum; 2) distributing reinforcement drill holes according to the geophysical prospecting result, wherein an angle alpha between the reinforcement drill holes and the horizontal plane is a high inclination-angle as possible; 3) slip-casting by using cement paste through the reinforcement drill holes; and 4) controlling the pressure of boreholes to less than twice that of L8 limestone hydraulic pressure. The method thoroughly avoids the passive situation that forced cessation of production of the coalface is caused by groundwater burst fatalness.

Description

technical field

[0001] The invention relates to the field of mining, especially for the coal seam floor L 8 Limestone mines threatened by water inrush are in progress. Floor L 8 Limestone grouting reinforcement and effective protection of the coal seam floor and L during the reinforcement process 8 Method of aquitard between limestone. Background technique

[0002] With the increase of mine mining depth, the coal seam floor L 8 The hydraulic pressure of the limestone also increases, which requires the coal seam floor L 8 The grouting pressure of limestone grouting also increases accordingly. Since the existing reinforcement boreholes are all constructed with small inclination angles, the length of the drillholes passing through the water-resisting layer of the coal seam floor during the grouting process is relatively large, and when grouting reinforcement The grouting pressure is not controlled; resulting in coal seam floor L 8 The coal seam floor and L 8 The water-res...

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