True 3D Dynamic Static Shear Device for High Temp Pore Pressure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current rock shear devices lack the capability to apply dynamic and static combination loads in three dimensions and fail to conduct shear tests under high-temperature, high pore pressure, and chemical corrosion conditions, which are critical for accurately simulating the complex stress environments encountered in underground rock engineering.
Innovation Solution
A true three-dimensional dynamic and static combination shear device is developed, incorporating a hydraulic system, pore pressure coupling system, and main body loading system to apply loads in tangential, normal, and lateral directions, with a high-temperature shear box and corrosion-resistant materials to simulate the effects of high-temperature, high pore pressure, and chemical corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional direct shear tests are used considering only tangential and normal stress, then the test setup is simple, but it does not accurately reflect the true triaxial stress conditions present in underground engineering rock structural planes
Solution Approach 1:
The patent implements true triaxial stress conditions by nesting loading systems within the shear device structure. The main body loading system applies normal stress, while additional loading mechanisms apply lateral and tangential stresses, creating a nested configuration where multiple stress components are applied through integrated but distinct loading paths within the same device framework.
Solution Approach 2:
The shear device is segmented into functionally independent loading systems: a main body loading system for normal stress, a lateral loading system for lateral stress, and a tangential loading system for shear stress. Each system can be controlled independently, allowing precise application of true triaxial stress conditions while maintaining modularity in the device structure.
2Measurement precision
If rock shear devices incorporate shear functionality under true three-dimensional static conditions, then the stress simulation improves, but there is a significant gap in achieving true three-dimensional shear functionality for rocks subjected to both dynamic and static combined loads
Solution Approach 1:
The patent incorporates dynamic loading capabilities by introducing disturbance loading systems that can apply dynamic tangential and lateral loads in addition to the static normal stress. The loading systems are designed to accommodate both static and dynamic components, with controllable loading rates and frequencies, enabling simulation of dynamic and static combined load conditions.
Solution Approach 2:
The loading systems are designed with multi-functionality to handle both static and dynamic loads. The same loading mechanisms can apply sustained static stresses or time-varying dynamic loads, and the control system can switch between different loading modes, making the device universally applicable to various loading conditions without requiring separate dedicated systems.
3Adaptability or versatility
If rock shear devices are designed to conduct shear tests under high temperatures and high pore pressure, then the environmental simulation capability improves, but they often fall short in achieving high pore pressure and comprehensive multi-field coupling
Solution Approach 1:
The patent introduces a pore pressure coupling system as an intermediary mechanism that connects the hydraulic system to the rock sample environment. This coupling system mediates the transmission of high pore pressure to the sample while maintaining control and measurement capabilities. The system includes pressure-resistant components and sealing mechanisms that ensure reliable pressure application in high-temperature and chemical corrosion environments.
Solution Approach 2:
The device employs composite material construction for components exposed to high-temperature, high pore pressure, and chemical corrosion. This includes using corrosion-resistant alloys, high-temperature seals, and chemically inert materials in the pore pressure coupling system and shear box, ensuring reliability and durability under the combined multi-field coupling conditions.
4Stress or pressure
If existing rock shear devices capable of applying pore pressure are used, then some pore pressure testing is possible, but they fall short of the high-pressure demands required for accurate testing
Solution Approach 1:
The patent implements high pore pressure capability by designing the pore pressure coupling system with pressure-resistant components rated for high pressures. The hydraulic system parameters are configured to generate and maintain high pore pressure levels, with pressure-resistant seals, strengthened pressure chambers, and high-pressure piping that ensure both the achievement of high pressure and the reliability of measurements at these pressure levels.
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 enables multi-directional disturbance shear tests under true triaxial stress conditions, effectively applying dynamic and static loads while withstanding high pore pressures and chemical corrosion, providing a comprehensive testing environment for rock structural planes, enhancing the understanding of rock mechanics in complex underground conditions.
Implementation Method 1
a hydraulic system, a pore pressure coupling system and a main body loading system; the main body loading system is connected to both the hydraulic system and the pore pressure coupling system and controlled by the hydraulic system to apply load to a sample
Implementation Method 2
the pore pressure coupling system is designed to supply water to a true three-dimensional high-temperature and high pore pressure shear box within the main body loading system, facilitating the completion of high-temperature, high pore pressure and chemical coupling for the sample
Implementation Method 3
a true three-dimensional high-temperature and high pore pressure shear box within the main body loading system
Implementation Method 4
the pore pressure water often carries acidic substances, continuously eroding the rock mass, thereby further compromising its integrity and mechanical properties
Data Source
AI summary
The present application provides a true three-dimensional dynamic and static combination shear device under high-temperature, high pore pressure and chemical coupling and a method therefor, specifically designed for the rock indoor loading test technical field. The device includes a hydraulic system, a pore pressure coupling system, an annular frame, a frame base, a lateral horizontal support platform, a lateral floating frame, a normal dynamic and static combination loading cylinder, a lateral dynamic and static combination loading cylinder, a tangential hydrostatic loading cylinder, a tangential disturbance loading cylinder, a high-temperature box, and a true three-dimensional high-temperature, high pore pressure and chemical coupling shear box.