Liquid Latex Specimen Preparation for Rock Testing
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Solution Overview
Problem
Existing methods for preparing triaxial specimens of highly-weathered rock are inadequate in eliminating the membrane penetration effect, leading to inaccurate test results due to uneven surfaces and large pits, which cannot be fully addressed by conventional methods like attaching copper or stainless steel sheets.
Innovation Solution
A specimen preparation method involving filling pits on the surface of the specimen with liquid latex to smooth the surface, followed by curing within a membrane sleeve under confining pressure, ensuring the latex fills voids and eliminates membrane penetration during triaxial shear tests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional methods like attaching copper or stainless steel sheets are used to eliminate membrane penetration, then the membrane penetration effect is reduced, but the specimen surface unevenness and large pits cannot be fully addressed
Solution Approach 1:
The patent applies preliminary action by filling the pits and uneven surfaces of the specimen with liquid latex before conducting the triaxial shear test. This pre-treatment ensures that when confining pressure is applied during the test, the membrane cannot penetrate into voids, thereby eliminating the membrane penetration effect while maintaining specimen integrity
Solution Approach 2:
The patent uses liquid latex as an intermediary material to fill the gaps and uneven surfaces of the specimen. The liquid latex acts as a mediator between the specimen surface and the confining pressure, preventing direct membrane penetration while preserving the original specimen structure and dimensions
2Manufacturing precision
If liquid latex is used to fill pits and smooth the specimen surface, then surface uniformity is improved, but additional preparation steps are required
Solution Approach 1:
The patent applies parameter changes by utilizing the physical properties of liquid latex - its ability to flow into pits and voids, then cure to form a solid filling material. By changing the state of the latex from liquid to solid through curing, the specimen surface is transformed from uneven to uniform, achieving high manufacturing precision with relatively simple preparation steps
3Reliability
If confining pressure is applied to press liquid latex into specimen voids, then membrane penetration is eliminated, but preparation time increases
Solution Approach 1:
The patent replaces the need for complex mechanical pressing systems with a simpler approach: applying confining pressure during the triaxial shear test itself to press the liquid latex into specimen voids. The confining pressure serves dual purposes - both eliminating membrane penetration and facilitating latex infiltration, thereby reducing overall preparation time while maintaining reliability
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 effectively eliminates the membrane penetration effect, providing accurate, reliable, and precise triaxial shear test results with low costs, simple operations, and non-toxic materials, suitable for highly-weathered rocks containing clay particles.
Implementation Method 1
filling pits on the surface of the specimen with liquid latex
Implementation Method 2
press the liquid latex into the specimen under a confining pressure
Implementation Method 3
the packaged specimen is placed in a moisture preservation vat and stands until the liquid latex on the peripheral surface of the specimen is cured
Data Source
AI summary
A specimen preparation method for eliminating a membrane penetration effect on a highly-weathered rock, wherein the method makes an originally uneven surface of a specimen smooth using a cured liquid latex as a filler, thereby eliminating a membrane penetration effect on a highly-weathered rock, and comprises the following specimen preparation steps: specimen cutting, pit filling, surface smoothing, specimen shaping and specimen loading.