Grouting reconstruction of loose aquifer overlying work face and its effect test

XIE Jian; XU Daqiang; HU Wei; ZHANG Peisen

doi:10.13347/j.cnki.mkaq.2023.10.022

Safety in Coal Mines > 2023 > 54(10): 168-175. > DOI: 10.13347/j.cnki.mkaq.2023.10.022

XIE Jian, XU Daqiang, HU Wei, et al. Grouting reconstruction of loose aquifer overlying work face and its effect test[J]. Safety in Coal Mines, 2023, 54（10）: 168−175. DOI: 10.13347/j.cnki.mkaq.2023.10.022

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Grouting reconstruction of loose aquifer overlying work face and its effect test

XIE Jian^1,,
XU Daqiang^{2, 3},
HU Wei¹,
ZHANG Peisen^{2, 3}

1.
Anhui Hengyuan Coal & Electric Co., Ltd., Suzhou 235139, China
2.
National Key Laboratory for Mine Disaster Prevention and Control, Shandong University of Science and Technology, Qingdao 266590, China
3.
National Demonstration Center for Experimental Mining Engineering Education, Shandong University of Science and Technology, Qingdao 266590, China

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Received Date: August 11, 2022
Available Online: October 17, 2023

Graphical Abstract

Abstract

Abstract

In order to liberate the shallow quaternary loose aquifer coal pillar resources, taking the 1010-1 working face of the first mining area of Wugou Coal Mine as the test object, the grouting reinforcement test of quaternary loose aquifer and the weathering zone of the bedrock at the bottom was carried out by using the splitting grouting method and the grouting technology combining continuous and intermittent grouting. The results show that: the quaternary loose aquifer control area has complex lithology and weak water content, and mainly receives runoff recharge from the lateral area. The grouting reconstruction project adopts the water displacement and sand fixation scheme of the ground straight hole combined with the directional oblique hole row by row; the strength of the mixed slurry is subject to the ratio of fly ash, and the strength and stone rate of the mixed slurry are higher than those of the cement net slurry. When the fly ash content is 20%, the stone rate is the highest; the diffusion of grout in the quaternary loose aquifer is very uneven, the grouting process needs to control the grout diffusion range by controlling the grouting amount, the influence of grouting on the surface is reflected in the grout diffusion and pressure conduction, and the pressure conduction is the main one; after injection, the true density and water content of the core hole samples slightly increased, while the compressive strength, tensile strength and shear strength slightly increased; with the increase of sampling depth, the compressive strength of the rock layer in the wind-oxidized zone of bedrock increased first, then decreased and then increased, and the compressive strength increased about 2-5 times.
- mining engineering,
- loose aquifer,
- grouting transformation,
- slurry diffusion,
- effect of inspection

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References (21)

References

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Grouting reconstruction of loose aquifer overlying work face and its effect test