Suspension type guiding device and construction method for paste filling of underwater goaf

Abstract

The invention discloses a suspension type guiding device for paste filling of an underwater goaf. The suspension type guiding device for paste filling of the underwater goaf comprises a water enteringportion, a pressure adjusting and controlling portion and a buoyancy portion which are connected in sequence; the water entering portion is provided with at least one water entering hole; the pressure adjusting and controlling portion is provided with a pressure cavity; a pressure bearing slide plate is arranged between the pressure cavity and the water entering hole, and slides in the pressure cavity; the side wall of the pressure cavity is provided with multi-stage pressure non-return valve in an arrayed manner in the direction from the water entering portion to the buoyancy portion; and the set pressure of the multi-stage pressure non-return valves is sequentially increased in the direction from the water entering portion to thee buoyancy portion. The invention further provides a construction method for paste filling of an underwater large-volume goaf. The suspension type guiding device and construction method for paste filling of the underwater goaf have the beneficial effects that the paste filling and transporting problem of an underwater large-volume space is solved, and the grout liquid segregation problem caused by the fact that grout liquid is conveyed in a vertical non-pressure pipeline is solved.

Description

Technical field [0001] The invention belongs to the technical field of underground goaf treatment, and particularly relates to a suspension guide for filling an underwater goaf with paste and a construction method. Background technique [0002] The mined-out area refers to the mining space formed underground after the underground resources are mined. According to the different mining types and mining methods, the roof of the mined-out area shows different failure modes, and the surface also has different deformation characteristics. For example, when using the total subsidence method for mining, the roof of the ore body will continue to collapse with the expansion of the mining area, resulting in the formation of a collapsed basin on the surface, and the destruction of the surface occurs immediately following the mining of the ore body; When mining under the partial subsidence method (room and pillar type), the roof of the ore body is relatively stable. When the pillar is stable,...

AI Technical Summary

Problems solved by technology

However, when treating the goaf after the mine is closed, the groundwater will gradually fill the entire goaf with the cessation of groundwater pumping and drainage. Under such working conditions, the conventional construction technology cannot meet the requirements of goaf treatment.

Taking paste pumping and high-concentration full tailings cemented filling as an example, its original advantages are long-distance transportation, high stone body strength, segregation resistance, good workability, and not suitable for pipe plugging. In the case of water, the original concentrated paste material is easy to decompose and segregate when it encounters water during pipeline transportation, and cannot reach the gob space

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