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CN-121993252-A - Grouting water plugging method for underground mining mine construction of potash salt ore

CN121993252ACN 121993252 ACN121993252 ACN 121993252ACN-121993252-A

Abstract

The invention discloses a grouting water plugging method for underground mining of sylvite mine construction. The method comprises a preliminary grouting step of carrying out earth surface grouting on an aquifer through earth surface drilling, a tail salt filling step of filling potassium salt ore tail salt with saturated brine as a carrier to form a tail salt stack if the water layer is not pressurized after the preliminary grouting step, a double-liquid grouting step of temporarily solidifying the inside of the tail salt stack after the tail salt filling step by using double-liquid grouting, and a single-liquid grouting step of injecting single-liquid grouting on the upper part and the side part of the tail salt stack after the double-liquid grouting step to form a covering shell. The method for grouting and plugging water in underground mining of sylvite mine utilizes sylvite mine tail salt to replace traditional grouting materials, reduces resource waste and water control cost, adopts a staged curing mode to form a multi-layer waterproof structure, improves plugging efficiency, adopts dynamic pressure regulation and control to adapt to different leakage scenes, and optimizes construction flow.

Inventors

  • Guo Baichun

Assignees

  • 郭柏春

Dates

Publication Date
20260508
Application Date
20260306

Claims (9)

  1. 1. The grouting and water plugging method for underground mining of sylvite is characterized by comprising the following steps: Performing preliminary grouting, namely performing surface grouting on the aquifer through surface drilling; A tail salt filling step, wherein if the preliminary grouting step is not pressurized, the saturated brine is used as a carrier to fill the potassium salt ore tail salt to form a tail salt stack; A double-slurry grouting step, wherein the tail salt filling step is followed by curing the interior of the tail salt stack by double-slurry; And (3) a single-liquid slurry injection step, wherein single-liquid slurry is injected into the upper part and the side part of the tail salt stack body after the double-liquid slurry filling step to form a covering shell.
  2. 2. The method for grouting and plugging water for underground mining of sylvite mine according to claim 1, wherein in the preliminary grouting step, single-liquid slurry or double-liquid slurry is adopted for grouting, and the grouting amount is controlled to be 40-50 cubic meters.
  3. 3. The method for grouting and plugging water for underground mining of sylvite mine according to claim 1, wherein the pressure after the preliminary grouting step is less than 0.5Mpa, and the tail salt filling step is performed until the filling pressure is more than 3 Mpa.
  4. 4. The method for grouting and plugging for underground mining of sylvite mine construction according to claim 1, wherein in the step of filling the tail salt, the solid content of the tail salt in the filling material is more than 60%, and magnesium oxide and calcium oxide are added.
  5. 5. The method for grouting and plugging for underground mining mine construction of sylvite according to claim 4, wherein the average particle size D50 of the tail salt is 0.3-0.6mm, and the maximum particle size exceeds 1mm.
  6. 6. The method for grouting and plugging for underground mining mine construction of sylvite according to claim 4, wherein the tail salt further comprises stone particles and/or sand.
  7. 7. The method for plugging water by grouting construction of underground mining mine of sylvite ore according to claim 1, wherein in the step of grouting by double liquid slurry, the double liquid slurry is injected until the pressure reaches 3Mpa-5 Mpa.
  8. 8. The method for plugging water by grouting construction of underground mining mine of sylvite ore according to claim 1, wherein the double slurry used in the preliminary grouting step or the double slurry grouting step is cement and water glass.
  9. 9. The method for plugging water by grouting construction of underground mining mine of sylvite ore according to claim 1, wherein the single-liquid grouting step is carried out until the pressure reaches 3Mpa-5 Mpa.

Description

Grouting water plugging method for underground mining mine construction of potash salt ore Technical Field The invention belongs to the field of mine construction engineering, and particularly relates to a grouting water control process in a sylvite mine construction process. Background Potassium chloride is used as one of three fertilizers, is an indispensable fertilizer for agricultural production, and is mainly produced from brine or underground ore. The underground ore transportation mainly comprises different processes such as inclined shaft, vertical shaft, water extraction and the like. Wherein the inclined shaft is particularly suitable for shallow potassium salt mine exploitation. The formation geological conditions of the kalium salt mine are complex, and the formation of the kalium salt mine is mostly sea-source land phase evaporation deposition according to related data, and a water-bearing layer of a mining area is divided into four layers which cover a fourth loose rock pore water layer, an upper salt layer fracture water-bearing rock group of an upper mudstone layer, a middle mudstone layer fracture water-bearing layer and a lower mudstone layer fracture water-bearing layer. The contact zone (the grey mud layer) of the upper mud layer and the upper salt layer gypsum layer is easy to enrich groundwater, the gypsum layer is broken under the influence of the structure in the construction process of the inclined shaft, surrounding karst cavities develop, and the gypsum layer can reach medium water enrichment. The middle salt layer has water-resisting property to brine and the like, but the internal salt vein is soluble salt, so that the salt vein is easy to dissolve when meeting fresh water, and when the water of the grey mud layer invades, a water filling channel can be formed rapidly, but the salt vein has the non-uniform characteristic, and the water filling channel has no regularity, and because of the particularity of the geological structure, if the treatment and the prevention are not in place, a large number of water-flushing accidents can be easily caused in the construction or use stage. The traditional treatment method for the potash salt ore construction water gushing mainly adopts curtain grouting and local grouting modes, grouting materials comprise single-liquid slurry, double-liquid slurry and the like, as the potash salt ore slurry stratum contains salt water and the salt content in soil is high, the traditional single grouting process has the defects of long curing time or low curing strength due to the influence of the salt content, the overall grouting effect is slow, the cost is high, and the quality of grouting, mine safety and construction period are possibly influenced. Therefore, development of a novel potassium salt mine water treatment process is urgently needed, economical and efficient water treatment is achieved, and mine safety is improved. In addition, the method can also be suitable for water treatment requirements of other similar mine geological conditions. CN202411903335 discloses a drilling drainage depressurization reinforced grouting method for confined aquifer, but does not emphasize the influence on grouting strength, grouting effect and setting time under the condition of high salt of water gushing of potash salt ore. CN202411086369 discloses a water bursting blocking treatment pulping system and a pulping method suitable for coal seam floor water bursting blocking treatment pulping method, but does not solve the problems of high grouting cost and long period when the grouting amount is too large. The problems of low grouting strength and poor coagulation effect of cement slurry directly used under the condition of salt-containing water gushing similar to a potash salt ore are not solved. Disclosure of Invention Aiming at the technical problem that water is easy to flow out and leak in the crossing area of the underground grey mudstone section aquifer and the tunneling construction, the technology realizes high-efficiency waterproof plugging by combining tail salt filling with staged solidification. The invention provides a grouting water plugging method for underground mining of sylvite mines, which comprises a preliminary grouting step, a tail salt filling step, a double-liquid grouting step and a single-liquid grouting step, wherein the preliminary grouting step is used for carrying out surface grouting on an aquifer through surface drilling, if the preliminary grouting step is not carried out, the tail salt is filled with sylvite mine tail salt by taking saturated brine as a carrier to form a tail salt stack body, the double-liquid grouting step is used for solidifying the inside of the tail salt stack body after the tail salt filling step, and the single-liquid grouting step is used for carrying out single-liquid grouting on the upper part and the side part of the tail salt stack body to form a covering shell after the double-liquid grouting step. Ac