Grouting Sample Preparation with Internal Defects
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Solution Overview
Problem
Current grouting reinforcement methods in geotechnical engineering face challenges in simulating natural defects, leading to difficulties in researching the mechanical properties and failure mechanisms of grouting consolidation with internal defects.
Innovation Solution
A method is developed to prepare grouting consolidation samples with internal defects by carving a groove in plasticine, filling it with a low-melting point material, and then incorporating this defect model into a casting mold, followed by injection and solidification of a slurry, allowing for controlled creation of defects such as cracks and holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional grouting reinforcement methods are used, then grouting consolidation is formed, but internal defects such as cracks and holes cannot be simulated
Solution Approach 1:
The patent applies preliminary action by pre-carving grooves in plasticine to form defect molds before grouting. The grooves are prepared in advance with specific shapes (hemispherical, sheet-like, irregular) to simulate internal defects, and low-melting-point material is pre-placed in these grooves. This preliminary preparation enables accurate defect simulation while simplifying the overall manufacturing process.
Solution Approach 2:
The patent uses low-melting-point material (wax, paraffin, asphalt, or rosin) as an intermediary substance to create defect models. This material is melted and poured into pre-carved grooves, then solidifies to form realistic defect shapes. The intermediary material enables precise defect simulation without requiring complex direct carving in the final grouting consolidation sample.
2Reliability
If internal defects are introduced into grouting consolidation samples, then research on failure mechanisms becomes possible, but sample preparation becomes more complex
Solution Approach 1:
The patent segments the sample preparation process into distinct stages: (1) carving grooves in plasticine to form defect molds, (2) placing and melting low-melting-point material to create defect models, (3) positioning defect models in casting molds, and (4) injecting slurry to form grouting consolidation. This segmentation makes the complex process of creating defect-containing samples more manageable and reproducible.
Solution Approach 2:
The patent utilizes parameter changes, specifically temperature changes, to manipulate the low-melting-point material. The material is heated above its melting point (40-90°C) to become liquid for pouring into grooves, then cooled to solidify and form the defect model. This parameter change enables easy creation and removal of defect models without complex mechanical processes.
3Adaptability or versatility
If various shapes of defects are prepared, then research requirements are met, but preparation time increases
Solution Approach 1:
The patent uses parameter changes (temperature) to enable rapid creation of various defect shapes. By heating the low-melting-point material, it becomes fluid and can be easily poured into pre-carved grooves of any shape (hemispherical, sheet-like, irregular). The material then quickly solidifies upon cooling. This parameter-based approach allows versatile defect shape creation without increasing preparation time significantly.
Solution Approach 2:
The patent employs copying by creating defect models through molds (grooves carved in plasticine) rather than directly shaping defects in the final sample. The groove shapes serve as templates that are copied into the low-melting-point material, which then forms the actual defect models. This copying approach enables efficient reproduction of various defect shapes while reducing preparation time.
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
This method enables the creation of grouting consolidation samples with varied internal defects, facilitating research on the grouting reinforcement mechanism and providing insights into the mechanical properties and failure characteristics of fractured rock masses.
Implementation Method 1
Heat the low-melting point material to melt, and pour the melted low-melting point material in liquid form into the groove
Implementation Method 2
After the low-melting point material is cooled and thereafter solidified to form a defect model
Implementation Method 3
After the slurry reaches the slurry's solidification time as designed by the experiment
Implementation Method 4
place the sample into an oven to heat at a temperature above the melting point of the low-melting point material
Implementation Method 5
heat at a temperature above the melting point of the low-melting point material
Data Source
AI summary
The present application discloses a grouting consolidation sample containing internal defects and the preparation method thereof. Firstly, plasticine is employed to prepare a wax model with the desired defect shape, then a fixing device is used to fix the wax model onto a specific position in a casting mould of consolidation and thereafter a slurry is poured to form a grouting consolidation sample, after the grouting consolidation sample reaches the predetermined strength, the grouting consolidation sample containing the wax model is put into an oven to heat at a temperature above the melting point of wax to demolish the structure of the wax model to form a grouting consolidation sample with internal defects.