Grouting technology for controlling water-stop curtain of dolomite vertical shaft of large-thickness water-rich lamp shadow group

Abstract

The invention discloses a grouting technology for controlling the water-stop curtain of a dolomite vertical shaft of a large-thickness water-rich lamp shadow group, which comprises the following stepsof: tapping by using a water source drilling machine on the ground, and drilling a grouting hole; preparing grouting a material; mixing and grouting. According ot the invention, firstly, plastic early strength slurry is used for filling a structural surface or a structural belt or other mian water guide networks, which are with larger opening degree and are in the periphery of the grouting hole,and then a mixed grouting method is used, the setting time of the slurry is increased while ensuring the construction efficiency; that the plastic early-strength slurry has sufficient setting time isensured to increase the setting time of the slurry, that the unsolidified calculus body is extruded away from the grouting curtain of a designed shaft under the grounting pressure, which wastes the grouting material, is avoided; when the main water guide network is filled, that is, the grouting pressure rises, the clay cement slurry is used to fill a secondary water guide fissure network, so thata permanent grouting curtain is formed, and one third of the grouting material is saved compared with a prior grouting method, and the planned construction period is one fifth in advance.

Description

technical field [0001] The invention relates to the technical field of water prevention and control in mine vertical shaft shaft construction. Specifically, it is the water-stop curtain control grouting technology of Juhou Fushui Dengying Formation dolomite vertical shaft wellbore. Background technique [0002] The construction conditions of the vertical shaft shaft are harsh and difficult, which is the key project of mine construction, and when it must pass through the aquifer with strong water-richness, it is even more difficult. In recent years, there have been many well shaft water inrush and flooding accidents in our country, resulting in huge economic losses. Therefore, during the mine construction period, the well shaft water prevention work is the top priority. [0003] Sedimentary phosphorites account for 70% of the total reserves in my country, and the Sinian sedimentary phosphorite deposits are large in scale, but the Sinian phosphorite deposits occur in the larg...

AI Technical Summary

Problems solved by technology

Therefore, injecting a large amount of grout into each grouting section of the conventional grouting process is difficult to meet the grouting end standard, a large amount of grouting material is wasted, an effective grouting curtain cannot be formed, and the grouting effect cannot be achieved, which greatly increases the cost of wellbore water prevention and control; Moreover, due to the grouting times of each grouting section being more than 5 times, it is still difficult to meet the end standard, resulting in a serious delay in the construction period

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