A grouting reinforcement technology for underground coal seam floor based on three steps and three speeds

Abstract

The invention relates to a three-step and three-speed grouting reinforcement process for underground coal seam floor, which belongs to the field of coal mines. The three steps refer to that when grouting, clay slurry is firstly injected, followed by clay-cement mixed slurry, and finally grout is injected. , sequentially select the grout type successively, so that the grouted rock strata form a clay slurry filling layer, clay cement mixed slurry filling reconstruction section, and cement slurry filling reinforcement layer from bottom to top and from far to near. The three speeds refer to that the slurry flow rate is controlled and allocated according to three speeds, the fast gear is first selected, and then the medium speed gear and the slow speed gear are used for grouting in turn. The grouting reinforcement process of the present invention, after the water is drilled, achieves rapid High-efficiency grouting effect, it can effectively grout to transform the floor aquifer under the condition of high water pressure.

Description

technical field [0001] The invention belongs to the field of coal mines, and in particular relates to a three-step and three-speed grouting reinforcement process for underground coal seam floors. Background technique [0002] For a long time, water inrush from the coal seam floor has been a major factor seriously affecting the safe exploitation of coal mine resources in my country, especially the fault water inrush in structural areas is more serious. For example, the Carboniferous-Permian coalfield in North China is an important coal-producing area in my country, and its lower coal formation is located above the water-rich Austrian ash aquifer or the Taiyuan limestone aquifer. Under the influence of mining activities, the possibility of floor water inrush may occur larger. According to statistics, three-fifths of the coal mines are threatened by the confined water of the coal seam floor to varying degrees; in North China alone, there are many mines affected by it, resulting...

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Problems solved by technology

At present, mines at home and abroad do not have mature technology and experience in the prevention and control of high-pressure water under complex hydrogeological conditions, and inevitably face some problems: mines generally follow the clay-mixed slurry uniform-velocity grouting method, and the clay-mixed slurry uniform-velocity grouting method is used throughout the grouting drilling Grouting, there are some deficiencies in the grouting process, and there will be problems that some drilling holes do not eat grout

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