Mesoscopic strain measurement device and measurement method of sand particle nanogel cementation zone

Abstract

The invention discloses equipment and a method for measuring mesoscopic strain of nanogel cementation regions of sand grains. The equipment comprises a load applying device, a cementation region forming device, a mark point spraying device, a particle image velocimeter and a data collection and control system, wherein the load applying device comprises a base, a force applying rod and a linear ultrasonic motor, the cementation region forming device comprises two hemispheric particles as well as a water pump, an organic glass sleeve with the semicircular section, a slim injection pipe and a nano-silicon sol storage container which are in sequential connection, the particle image velocimeter comprises a digital camera for PIV (particle image velocimetry) and a light source, and the data collection and control system is connected with the load applying device and the particle image velocimeter. The equipment has the advantages that the nanogel cementation region forming device applicable to non-contact strain measurement is designed, the problem of difficulty in measurement of the mesoscopic strain of the nanogel cementation regions is solved, and disturbance on samples is reduced effectively during measurement.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering research, and in particular relates to a mesoscopic strain measuring device and a measuring method of a sand particle nano gel cementation zone. Background technique [0002] In geotechnical engineering, nano-silica sol solution can be used for infiltration and reinforcement of loose sandy soil foundation. Nano-particles are suspended in the nano-silica sol solution, and these nanoparticles first gradually condense into a chain structure and then form a three-dimensional network-like gel in the process of reducing the alkalinity of the solution, thereby reinforcing the loose sandy soil foundation. Measuring the mesoscopic strain in the particle cementation zone through experiments is helpful to establish the constitutive model of the consolidated sandy soil from the mesoscopic scale. However, the cemented area between sand particles is relatively small, and traditional contact strain measu...

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Problems solved by technology

[0003] In order to overcome the problem that the prior art cannot provide an intergranular nanogel cementation area forming device applicable to non-contact strain measurement, and it is difficult to measure the mesoscopic strain of the sand particle cementation area, at the same time, in order to effectively reduce the impact on the sample during the test disturbance, the invention provides a mesoscopic strain measurement device and measurement method for the sand particle nanogel cementation zone

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