Water-rich sand layer grouting diffusion reinforcement simulation and permeability coefficient test device and method

Abstract

The invention discloses a grouting diffusion reinforcement simulation and permeability coefficient test device and method for a water-rich sandy soil stratum. The device comprises a sand layer simulation system, a slurry input system, a flowing water simulation system and a monitoring and data acquisition system, two ends of the sand layer simulation system are connected with a slurry inlet bin and a slurry outlet bin; the slurry input system is powered by an air compressor, and slurry is injected into the sand layer simulation system from a slurry inlet bin; the flowing water simulation system pumps flowing water into the sand layer simulation system; the monitoring and data acquisition system records changes of stratum parameters such as osmotic pressure and soil pressure. According to the invention, the transparent organic glass and the transparent soil material are applied, so that the visual simulation of the whole grouting diffusion and reinforcement process of the water-rich low-water-pressure sandy soil stratum can be realized, the permeability coefficients of reinforcing bodies at different diffusion distances can be integrally measured, and the visual simulation of slurry diffusion and reinforcement under the working condition of high-pressure flowing water in the sandy soil stratum can be carried out; the method plays a positive and beneficial reference role in actual grouting diffusion and reinforcement engineering of the water-rich sandy soil stratum.

Description

technical field [0001] The invention relates to the field of prevention and control of underground engineering geological disasters, and to the field of simulation tests of grouting prevention and control of water-rich sand layer disasters, in particular to a device and method for simulation of grouting diffusion reinforcement and permeability coefficient test of water-rich sand layer. Background technique [0002] The grouting method is to inject cement-based cementitious grout or chemical grout into the pores, cracks, cavities and confined aquifers of rock and soil. The permeability coefficient is formed to form a certain thickness of reinforcement layer to increase its strength and stability, and finally achieve the purpose of rock and soil reinforcement, seepage prevention and water blocking. Because this method has the advantages of good stratum reconstruction effect, low cost, and high construction efficiency, it has become an important method for seepage prevention an...

AI Technical Summary

Problems solved by technology

[0005] 1. Most of the existing grouting diffusion model test devices have "black box problems", and the effects of intuitive observation and perceptual knowledge are not good;

[0006] 2. In terms of the fixation of the test device, different working conditions cannot be simulated well, and the fault location of the device cannot be eliminated in time, the test effect is not good, and the recycling rate of the test device is poor;

[0007] 3. The test device cannot directly test the reinforcement effect of the grout, and it is necessary to separately sample the reinforced body, and then conduct the permeability coefficient test;

[0008] 4. It is difficult to accurately obtain the stress and strain of multiple locations during the process of grouting diffusion model, and the data collected during the grouting diffusion process is single, and it is difficult to uniformly measure the flow field, earth pressure field, and seepage field data of the seepage process

Images