Circumferential and Vertical Grouting for Soil Specimen Integrity
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Solution Overview
Problem
The existing methods for preparing solidified cohesionless soil specimens for triaxial tests face issues with nonuniform solidification, poor specimen integrity, and damage during specimen transfer due to unidirectional grouting and improper handling.
Innovation Solution
A device and method combining circumferential grouting, internal vertical grouting, and electrochemical grouting, with a two-piece structure PMMA pipe and circumferential grouting cylinder, to enhance solidification and minimize specimen damage during handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If unidirectional grouting is used to solidify the soil unit, then the grouting process is simple, but the solidification is nonuniform and specimen integrity is poor
Solution Approach 1:
The grouting process is segmented into multiple directions: circumferential grouting through the side wall and vertical grouting through the top and bottom surfaces. This multi-directional approach ensures uniform solidification throughout the soil specimen, resolving the nonuniform solidification problem caused by unidirectional grouting while maintaining process simplicity.
Solution Approach 2:
The patent combines circumferential grouting and vertical grouting into a single integrated system. The grouting device includes both circumferential grouting holes in the side wall and vertical grouting holes in the top and bottom surfaces, allowing simultaneous multi-directional grouting that achieves uniform solidification without complicating the overall process.
2Device complexity
If unidirectional grouting is used, then the equipment is simple, but specimen integrity is poor due to exfoliation of soil particles
Solution Approach 1:
The grouting equipment is segmented into multiple independent components: circumferential grouting holes distributed around the side wall, vertical grouting holes in the top and bottom surfaces, and corresponding grouting pipes for each direction. This segmentation allows the grout to penetrate from multiple directions simultaneously, preventing soil particle exfoliation and ensuring specimen integrity while keeping each component simple.
Solution Approach 2:
Different regions of the grouting device have specialized functions: the circumferential grouting holes provide lateral penetration, while the vertical grouting holes provide top-down and bottom-up penetration. This local specialization ensures that each area of the soil specimen receives appropriate grouting pressure and direction, preventing exfoliation and maintaining overall specimen integrity.
3Loss of time
If improper specimen-transferring method is used, then the transfer process is quick, but the specimen is damaged after grouting
Solution Approach 1:
The grouting device incorporates a cushioning structure that supports the soil specimen during the grouting process. The circumferential grouting cylinder and vertical grouting plates provide a protective framework that prevents soil particle exfoliation and specimen damage. This beforehand cushioning allows for quick transfer while maintaining specimen integrity, as the specimen is already protected during the critical grouting phase.
4Manufacturing precision
If circumferential grouting and vertical grouting are combined, then solidification uniformity is improved, but the device complexity increases
Solution Approach 1:
The grouting device is designed with multi-functionality: the same basic structure (grouting cylinder with holes and grouting pipes) serves both circumferential and vertical grouting functions. The circumferential grouting holes and vertical grouting holes follow the same design pattern, allowing the device to perform multiple grouting directions without requiring entirely separate systems, thus limiting the increase in device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The combined grouting methods improve solidification uniformity and specimen integrity, reducing damage during specimen preparation and handling, and allow for efficient recycling of grout, resulting in a more reliable triaxial test specimen.
Implementation Method 1
a first peristaltic pump arranged at a first end of the grouting pipe; the first peristaltic pump is configured to drive the grout in the first vessel to pass through the first end of the grouting pipe
Implementation Method 2
a combination of the DC power supply, the second electrode rod and the first electrode rod is configured to enable an electrochemical grouting, so as to promote a flow diffusion of the grout in the circumferential grouting cylinder
Implementation Method 3
a soil specimen to be solidified is prepared into the solidified cohesionless soil specimen in the circumferential grouting cylinder
Data Source
AI summary
A device and method for preparing a solidified cohesionless soil specimen for triaxial test. The device includes a first vessel for storing a grout, a first peristaltic pump, a grouting pipe, a first electrode rod, a direct-current power supply, a first glass stopper, a PMMA pipe, a circumferential grouting cylinder, a first hoop sleevedly provided on the circumferential grouting cylinder, a second hoop sleevedly provided on the PMMA pipe, a return pipe, a second glass stopper, a second electrode rod, a liquid outlet pipe, a first water-stop clamp, a second water-stop clamp, a second vessel for collecting an exudate, and a second peristaltic pump.