Critical experiment simulation equipment for permeation and separation grouting

Abstract

The invention discloses critical experiment simulation equipment for permeation and separation grouting. The critical experiment simulation equipment comprises an overbarden pressure simulation unit,a grouting experiment tank unit and a confining pressure simulation unit. The grouting experiment tank unit comprises a steel outer barrel, a steel inner barrel and a soil sample. The soil sample is arranged in the steel inner barrel. A first cover is arranged on the steel outer barrel. A cavity is formed between the steel outer barrel and the steel inner barrel. A hole communicated with the cavity is formed in the side wall of the steel inner barrel. A geotechnical cloth is arranged on the inner wall of the steel inner barrel. A pore pressure meter and a first water drain pipe are mounted atthe bottom of the grouting experiment tank unit. A pressure bearing plate is arranged above the soil sample and located below the first cover. A grouting pipe is arranged on the first cover. A gas pipeline for injecting high-pressure air into a gap between the first cover and the pressure bearing plate is arranged on the first cover. The critical experiment simulation equipment has the advantagesthat time and cost for on-site experimental grouting are omitted, and the effect of on-site permeation grouting is improved effectively.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, in particular to critical test simulation equipment for seepage splitting grouting. Background technique [0002] Seepage grouting can often play a positive role in the reservoir water leakage caused by the seepage of the dam, or even the instability of the dam body. However, infiltration grouting has extremely high requirements on the grouting process, including the selection of grouting parameters, the stress state on site, the physical and mechanical parameters of the soil on site, and the rheological properties of the slurry itself, etc., which will significantly affect the effect of infiltration grouting. Infiltration grouting with wrong parameters often fails to significantly increase soil shear strength and reduce soil permeability coefficient after grouting, which wastes engineering cost and construction period. Therefore, we propose a critical test simulation equipment f...

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Problems solved by technology

However, infiltration grouting has extremely high requirements on the grouting process, including the selection of grouting parameters, the stress state on site, the physical and mechanical parameters of the soil on site, and the rheological properties of the slurry itself, etc., which will significantly affect the effect of infiltration grouting. Infiltration grouting with wrong parameters often fails to significantly increase soil shear strength and reduce soil permeability coefficient after grouting, which wastes engineering cost and construction period. Therefore, we propose a critical test simulation equipment for infiltration splitting grouting

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