True Triaxial Rock Permeability Testing With Six-Direction Loading
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Solution Overview
Problem
Current rock permeability testing equipment is limited to traditional triaxial stress conditions, failing to accurately measure three-directional multiphase permeability under true triaxial stress states, which are common in deep underground environments, thus affecting the reliability and applicability of research results.
Innovation Solution
A test system and method for achieving three-directional multiphase seepage in a true triaxial loading process, incorporating a three-directional multiphase seepage loading cabin with a fluid injection and measurement system, including a sample metal frame, loading frame, fluid injection and recovery modules, and six loading indenter modules, capable of simultaneous measurement under true triaxial stress conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional triaxial stress conditions are used for testing, then the testing equipment is simpler and easier to operate, but the measurement cannot accurately reflect the true triaxial stress state in deep underground environments
Solution Approach 1:
The testing system is segmented into six independent loading indenter modules (X+, X-, Y+, Y-, Z+, Z- directions), each capable of independent stress application and permeability measurement. This segmentation allows the system to achieve true triaxial stress conditions while maintaining modularity and manageable complexity.
Solution Approach 2:
The system transitions from traditional triaxial testing (three stress components) to true triaxial testing by adding directional permeability measurement capabilities in multiple dimensions. The six loading indenter modules enable stress and permeability measurement in X, Y, and Z directions, creating a comprehensive three-directional multiphase seepage testing capability.
2Measurement precision
If existing true triaxial testing machines are used, then the stress state can be controlled, but only single-phase permeability in one direction can be measured
Solution Approach 1:
Each loading indenter module is designed with multi-functionality, capable of both applying mechanical stress and measuring permeability in its respective direction. The system can simultaneously perform three-directional stress control and three-directional multiphase permeability measurement, achieving universal testing capability for true triaxial conditions.
Solution Approach 2:
The system merges stress application and permeability measurement functions into an integrated testing platform. The fluid injection and recovery modules are combined with the loading indenter modules, allowing simultaneous measurement of multiple phases (gas, liquid, vapor) in three directions under true triaxial stress conditions.
3Measurement precision
If sealing pressure is increased to achieve better sealing integrity, then measurement precision improves, but the risk of sample damage and system failure increases
Solution Approach 1:
The system employs parameter changes by implementing a progressive sealing pressure approach. The sealing pressure is gradually increased from 0 to 25 MPa in controlled stages, allowing the system to achieve high sealing integrity while monitoring sample response and preventing sudden damage from excessive pressure.
Solution Approach 2:
The system incorporates feedback mechanisms through sensors that continuously monitor sealing pressure, fluid flow, and sample response. This feedback allows real-time adjustment of sealing pressure to maintain optimal sealing integrity while preventing pressure levels that could cause sample damage.
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
Enables simultaneous measurement of three-directional multiphase permeability with high precision and sealing integrity, achieving sealing pressures up to 25 MPa and fluid injection control with a maximum output pressure of 25 MPa, surpassing existing true triaxial testing machines.
Implementation Method 1
a rubber sealing ring is arranged inside the sample metal frame
Implementation Method 2
The fluid injection and measurement system includes a constant-current and constant-pressure pump and a fluid storage device
Implementation Method 3
the loading indenters of the six loading indenter modules are arranged in the sample metal frame and contact a sample
Implementation Method 4
a fluid channel is integrated into each loading indenter module, and the constant-current and constant-pressure pump is connected to the three-directional multiphase seepage loading cabin by a fluid channel
Data Source
AI summary
The provided is a test system and method for achieving three-directional multiphase seepage in a true triaxial loading process. The test system includes a three-directional multiphase seepage loading cabin including a sample metal frame, a loading frame, an outer plate, a fluid injection module, a fluid recovery module, and six loading indenter modules as well as a fluid injection and measurement system; the sample metal frame is arranged at a center of the loading frame, the outer plate is arranged on the loading frame, the fluid injection module and the fluid recovery module are arranged respectively at an upper part and a lower part of the loading frame, and the fluid injection and measurement system is connected to the three-directional multiphase seepage loading cabin; and the loading indenter modules are arranged in the loading frame from six directions, and the indenters of the loading indenter modules are arranged.