True Triaxial Creep Test Device with Independent Confining Pressure Plates
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Solution Overview
Problem
Current geotechnical engineering creep tests, particularly uniaxial and false triaxial tests, fail to accurately reflect the true stress and creep behavior of rock and soil due to the omission of confining pressure inequalities, leading to a lack of reliable instruments for measuring true triaxial creep, especially under low-strength conditions.
Innovation Solution
A device and method for measuring true triaxial creep using a supporting structure with four confining pressure plates and upper and lower compression plates to form an enclosed cavity around the test block, incorporating pressure sensors and hydraulic jacks for precise control of confining pressures and displacement measurement, allowing for independent stress application in multiple directions and reducing friction resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a true triaxial creep test instrument is used, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The device divides the confining pressure application into four independent components (four confining pressure plates) that can be controlled separately, allowing independent stress application in multiple directions while maintaining a relatively simple overall structure compared to traditional true triaxial instruments
Solution Approach 2:
The patent introduces pressure sensors as intermediaries between the confining pressure plates and the test block, enabling precise measurement and control of confining pressures without requiring complex mechanical transmission mechanisms
2Measurement precision
If a true triaxial creep test instrument is used, then measurement precision is improved, but cost increases
Solution Approach 1:
The device uses relatively simple and affordable components such as standard pressure sensors, hydraulic jacks, and steel plates instead of expensive specialized equipment, making the true triaxial creep test instrument more cost-effective while maintaining measurement precision
Solution Approach 2:
The device integrates multiple functions into a single system, including confining pressure application, pressure measurement, and displacement measurement, reducing the need for multiple separate instruments and thereby lowering overall cost
3Measurement precision
If a true triaxial creep test instrument is used, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The device incorporates pressure sensors that provide real-time feedback on confining pressures, allowing automatic adjustment and control through hydraulic jacks, which simplifies operation while maintaining precise measurement of triaxial creep conditions
4Device complexity
If uniaxial test is used, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The device transitions from uniaxial (one-dimensional) testing to true triaxial (three-dimensional) testing by applying confining pressures in multiple directions simultaneously, enabling accurate measurement of creep behavior under practical multi-axis stress conditions without requiring excessively complex instrumentation
5Device complexity
If false triaxial test is used, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The device applies different confining pressures to different directions (longitudinal and lateral) independently through four separate confining pressure plates, creating realistic non-uniform stress states that accurately represent practical conditions while maintaining relatively simple instrumentation
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 solution enables accurate and precise measurement of triaxial creep under low-strength conditions, overcoming previous limitations by simulating practical stress conditions and ensuring test precision through constant pressure control and automatic adjustment, thus improving the reliability of geotechnical engineering tests.
Implementation Method 1
hydraulic jacks are respectively arranged at the center of the bottom plate and at the centers of the lateral steel brackets inwards
Implementation Method 2
pressure sensors are vertically arranged at positions corresponding to the four confining pressure plates and the upper and lower compression plates in the supporting structure
Implementation Method 3
grating rulers are arranged on the pressure sensors
Implementation Method 4
four confining pressure plates and upper and lower compression plates to form an enclosed cavity for wrapping the test block
Data Source
AI summary
Device and method for measuring true triaxial creep of a geotechnical engineering test block, including a supporting structure; the device includes four confining pressure-plates and upper-and-lower compression-plates forming an enclosed cavity for the test block; confining pressure-plates include two long confining pressure-plates and two short-confining pressure-plates, upper-and-lower compression-plates are rectangular top and bottom steel-plates, two L-shaped long confining pressure-plates bent towards the outer side lapped on two adjacent side faces of the bottom steel-plate, two L-shaped short-confining pressure-plates bent towards the outer side lapped on remaining two-side faces of the bottom steel-plate, and bottom ends of the short-confining pressure-plates are placed on the bottom steel-plate; top ends of long confining pressure-plates lapped on the top steel-plate, and top steel-plate leans against inner side faces of two short-confining pressure-plates; vertically pressure sensors corresponds to four confining pressure-plates and upper-and-lower compression-plates in the supporting structure, and grating shortrulers on pressure sensors.