Saturated silty-fine sand layer induced grouting experimental model and experimental method

Abstract

The invention discloses a saturated silty-fine sand layer induced grouting experimental model and an experimental method, and belongs to the field of foundation and geotechnical engineering research.The experimental model comprises a model system, a grouting control system, a negative pressure induction system and an intelligent monitoring system. The principle of induced grouting is provided; bychanging conditions such as pressure, a grouting mode, grouting time, a sand layer structure, slurry components and the like, different porosities, water pressures, flow rates, time, consistencies and slurry diffusion rules under different flowing water flow conditions are monitored, and related information such as slurry diffusion, flow rate change, osmotic pressure distribution, energy loss andthe like is researched and monitored in the grouting process. Directional grouting and directional foundation reinforcement can be conducted on a saturated sandy soil foundation in a negative pressure induction mode, and the range and effect of foundation reinforcement can be achieved according to the engineering requirement and the induced grouting principle.

Description

Technical field: [0001] The invention relates to a foundation grouting reinforcement treatment technology, which is suitable for reinforcement and water stop of saturated sandy soil foundations of underground engineering such as subways, and belongs to the research field of foundation and geotechnical engineering. Background technique: [0002] Fine silt layer refers to the sandy soil layer in which the mass of particles with a particle size greater than 0.075mm exceeds 50% of the total mass, and the mass of particles with a particle size greater than 0.25mm is less than 50% of the total mass. It belongs to the loose sediment formed in the Quaternary period , is widely distributed. [0003] In the natural state of fine silt, the cementation is poor, the structure is loose, and the bearing capacity is low. It can be compacted under the action of its own weight. The density of the silt fine sand layer increases with the depth of burial. The silt fine sand is medium permeable. ...

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Problems solved by technology

[0007] The permeability and injectability of the saturated powder fine layer are extremely poor. The conventional grouting technology cannot make the grout penetrate into the formation and form an effective reinforcement. Although a large number of grouting theories have been proposed and a large number of field tests have been carried out for a long time, the grouting The grouting effect is extremely poor, so it is of great theoretical significance and engineering application value to carry out experimental research on saturated fine layer grouting

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