Coal mine underground reservoir and multi-layer grouting anti-seepage reinforcement method for reservoir dam

Abstract

The invention provides a coal mine underground reservoir and a multi-layer grouting anti-seepage reinforcement method for a reservoir dam and belongs to the field of coal mine underground construction. According to the multi-layer grouting anti-seepage reinforcement method, the area of the underground reservoir and the location of the coal pillar dam are determined and set through the volume; two side tunnels and withdrawal tunnels of the underground reservoir are drilled, concrete grout and silica sol are sequentially sprayed on the tunnel walls, and concrete and silica sol spray layers are formed; a plurality of shallow grouting holes are constructed in the sides, near the coal pillar dam, of the two side tunnels and the withdraw tunnels and the holes are sealed for grouting, and then a plurality of deep grouting holes are constructed and sealed for grouting; and finally, an artificial water retaining dam is constructed for sealing the tunnels, and accordingly the closed coal mine underground reservoir is formed. The multi-layer grouting anti-seepage reinforcement method has the double effects of reinforcement and sealing on the coal pillar of the coal mine underground reservoir; and nano-scale, inorganic, green and efficient materials are selected, the anti-seepage safety of the coal pillar dam can be ensured, and the coal mine underground reservoir is made durable and stable.

Description

technical field [0001] The invention relates to a multi-layer grouting anti-seepage reinforcement method for an underground reservoir of a coal mine and a dam body of the reservoir, which is suitable for construction of an underground reservoir of a coal mine and an underground storage chamber. Background technique [0002] In recent years, the focus of my country's coal production has gradually shifted to the west. The proven coal resource reserves in the western region (the five provinces of Shanxi, Shaanxi, Mongolia, Ningxia and Gansu) account for 71.6% of the country's total, while its water resources only account for 3.9% of the country's water resources. It belongs to the severe water shortage area. At the same time, the discharge of coal mine water to the ground not only pollutes the environment, but also exacerbates the shortage of water resources due to the large amount of water evaporation during the discharge process. Therefore, the shortage of water resources has ...

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Problems solved by technology

But the cement used in the above method, concrete itself is a kind of microporous material, there are cracks and fissures; black clay not only has microcracks, microcracks but also develops these cracks and fissures in certain seasons as time goes by Expansion; due to construction restrictions, it is impossible for the anti-seepage geotextile to cover the entire roadway surface. In addition, after the construction of the geotextile is completed, there will always be some defects, including seams caused by poor splicing quality, punctured during construction, etc. Defects such as broken, broken by the subfill layer, uneven tearing of the roadway wall and geotextile directly affect the anti-seepage performance of the dam body

[0003] Due to the shortcomings of the materials used in the above research methods and the existence of cracks and cracks, the dam body has a certain anti-seepage effect in the short term, but the coal mine underground reservoir is a long-term water storage place. As time goes by, the underground reservoir The water and water molecules in the reservoir slowly infiltrate through the micro-cracks, eventually causing the coal pillar dam body to be soaked in water for a long time, the strength is reduced, the instability is damaged, and the water body in the reservoir gushes out in large quantities, causing major coal mine flood accidents

Therefore, the existing methods cannot fundamentally solve the anti-seepage problem of the dam body.

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