Penetration grouting test system and method for reinforced loose gravelly soil

Abstract

The invention relates to a penetration grouting test system and method for reinforced loose gravelly soil, belonging to the technical field of rock engineering. The penetration grouting test system comprises a grouting pressure supply device, a grouting fluid storage device, a grouting test box and a grouting parameter monitoring device, wherein the outlet end of the grouting pressure supply device is communicated with a vent hole in top end of grouting fluid storage device through a pressure conveying pipeline; a slurry outlet in the bottom of the side surface of the grouting fluid storage device is communicated with a grouting pipe of the grouting test box through a liquid conveying pipeline; the grouting fluid storage device is arranged on an electronic balance; and the sidewall of thegrouting fluid storage device is vertically provided with scales. The test system of the invention can simulate the whole penetration grouting process of actual different field loose gravel strata ina spherical, cylindrical or cylindrical-hemispherical shape, monitor the dynamic change characteristics of the mass, volume and density of a grouting fluid in the grouting fluid storage device in realtime, and explore the temporal and spatial variation rules of a penetration pressure field and a temperature field in the whole grouting process.

Description

Technical field [0001] The invention relates to a penetration grouting test system and method for strengthening loose gravel soil, and belongs to the technical field of rock engineering. Background technique [0002] Grouting technology is an effective technical means to control the geological disasters induced by the loose gravel soil. Infiltration grouting is one of the earliest geotechnical construction techniques used in the field of grouting. As early as 1802, French civil engineer Charles Berlghy applied it to the repair of the Dieppe scouring gate project. Because it has a small disturbance effect on the injected medium or material during the grouting process, it has been widely used in construction, highways, railways, subways, mines, tunnels, hydropower and military engineering fields, and has achieved good results. The effectiveness of governance. [0003] At present, scholars at home and abroad have carried out in-depth explorations on the law of changes in the enginee...

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Problems solved by technology

[0003] At present, scholars at home and abroad have carried out in-depth explorations on the law of changes in the properties of loose gravel soil engineering, the natural disasters caused by it, and its application in the field of earth-rock dams and engineering seepage walls, and have achieved many useful results for practical engineering. However, there are not many systematic explorations and researches in the field of using grouting technology to strengthen loose gravel soil layers to improve their anti-seepage and bearing capacity, and there is a lack of effective grouting theoretical guidance. Only a small number of scholars use indoor simple grouting The simulated test device carried out tests to discuss the prediction model of parameters such as grouting volume, grout diffusion radius, and the compressive strength of concretions in gravel soil layers.

However, these studies have the following problems: (1) Due to the limitation of the size of the indoor simple grouting simulation test device, the injected medium used is quite different from the real loose gravel soil formation in the field, thus limiting these research results Application in actual anti-seepage engineering practice of loose gravel soil layer; (2) cannot reflect the variation law of the grouting fluid quality, volume and density in the grouting container during the entire grouting process; (3) cannot directly observe the grouting fluid The actual seepage and diffusion law in loose gravel soil layer; (4) It is impossible to explore the spatio-temporal variation of seepage pressure in the whole process of grouting, that is, the quantitative change characteristics of seepage pressure with grouting time and space; (5) It is impossible to explore Monitor the influence of the grouting process on the temperature of the injected medium; (6) The permeation and diffusion form of the grouting fluid in the experimental study is single, which cannot truly reflect the complex diffusion form of the grout in the loose gravel soil layer

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