Flexible Loading Triaxial Device for High-Geostress Simulation
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Solution Overview
Problem
Existing geotechnical test apparatuses lack the capability to simulate high-geostress environments and suffer from non-uniform load distribution, slow heat transfer, and structural integrity issues due to rigid loading mechanisms and frame structures.
Innovation Solution
A large-space high-temperature and high-pressure true triaxial flexible loading device is developed, featuring a cylinder reaction frame, a confining pressure reaction frame, and flexible loading mechanisms that allow for uniform triaxial loading, high-temperature heating, and improved structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If rigid loading mechanisms are used, then structural stability is improved, but load distribution uniformity deteriorates
Solution Approach 1:
The patent replaces rigid loading mechanisms with flexible loading bags that can conform to the test sample surface. The flexible material allows uniform load distribution while maintaining structural stability through the confining pressure reaction frame, directly resolving the contradiction between rigidity and load uniformity.
Solution Approach 2:
The patent introduces a flexible loading bag as an intermediary between the loading mechanism and the test sample. This intermediary component distributes the load uniformly across the sample surface while the confining pressure frame provides the necessary structural stability, solving the contradiction.
2Stress or pressure
If frame structure+pressure chamber is used, then confining pressure capability is improved, but structural integrity deteriorates
Solution Approach 1:
The patent extracts the loading mechanisms from the pressure chamber structure, placing flexible loading bags inside the chamber rather than using external frame structures. This allows the pressure chamber to maintain its integrity while still providing high confining pressure capability.
Solution Approach 2:
The patent uses flexible loading bags instead of rigid frame structures, allowing the pressure chamber to maintain its structural integrity while achieving high confining pressure capability through the flexible components that can deform without compromising the chamber structure.
3Device complexity
If solid-to-solid heat transfer is used, then structural simplicity is improved, but heat transfer efficiency deteriorates
Solution Approach 1:
The patent introduces a liquid heating medium (water or oil) that circulates through the pressure chamber, replacing solid-to-solid heat transfer. The liquid medium provides superior heat transfer efficiency while maintaining relatively simple structural implementation through circulation systems.
Solution Approach 2:
The patent utilizes phase transitions of the liquid heating medium (heating, circulating, cooling, repeating) to achieve efficient heat transfer. The liquid absorbs and releases thermal energy during circulation, providing high heat transfer efficiency without significantly increasing structural complexity.
4Force
If distributed small jacks are used, then loading capability is improved, but coordination difficulty increases
Solution Approach 1:
The patent merges multiple distributed loading points into a single flexible loading bag that applies load uniformly across the entire test sample surface. This eliminates the need to coordinate multiple small jacks while maintaining high loading capability through the flexible material's ability to distribute force evenly.
Solution Approach 2:
The patent uses a flexible loading bag that can deform to match the test sample surface, providing uniform load distribution across the entire sample. This single flexible component replaces multiple small jacks, improving loading capability while eliminating coordination difficulties.
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 device effectively simulates high-geostress environments, ensures uniform load distribution, enhances heat transfer efficiency, and maintains structural integrity, thereby overcoming the limitations of existing apparatuses.
Implementation Method 1
heating the test sample by oil bath
Implementation Method 2
The first oil guide hole and the second oil guide hole are both connected with an extraction and injection pump via a pipe, and a circulating hydraulic oil is injected into the cylinder by the extraction and injection pump
Implementation Method 3
a large-tonnage uniform load for a test sample by three pairs of jacks
Implementation Method 4
The first oil guide hole and the second oil guide hole are both connected with an extraction and injection pump via a pipe, and a circulating hydraulic oil is injected into the cylinder
Data Source
AI summary
A large-space high-temperature and high-pressure true triaxial flexible loading device includes a cylinder reaction frame, which includes a cylinder, a lower shear ring, an upper shear ring, a bottom cover, and a top cover, wherein the bottom cover and the top cover are detachably mounted at a bottom and a top inside the cylinder respectively, and an interior of the cylinder is divided to form a loading space for performing a triaxial test on a square test block; the lower shear ring is detachably embedded on an inner wall of the cylinder below the bottom cover; the upper shear ring is detachably embedded on the inner wall of the cylinder above the top cover; a confining pressure reaction frame, mounted in the loading space around the square test block; and, flexible loading mechanisms, disposed in pairs at two opposed side surfaces of the square test block.