Shear Box for Soft Rock Seepage and Vibration Testing
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Solution Overview
Problem
Current shear boxes for simulating the coupling of rainfall seepage and blasting vibration in shear rheology experiments face challenges such as difficulty in disassembling rock test pieces, water content management, backlash during testing, friction-induced energy dissipation, and the lack of cyclic vibration load application, which affect test accuracy and efficiency.
Innovation Solution
A shear box design featuring a vertically movable upper shear box connected to a lower shear box with a cuboid cavity, a water or gas inlet channel, and a sliding roller row to reduce friction, along with a mechanism for applying cyclic vibration loads, allowing for efficient sealing, quick wetting and drying cycles, and accurate rock test piece placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single hole is used for high-pressure water injection with integral molding of the test piece joint and normally-loading cushion block, then the sealing is maintained, but the disassembly of rock test pieces becomes tedious and test efficiency decreases
Solution Approach 1:
The patent divides the injection system into multiple independent injection holes (at least two) rather than using a single integral hole. The test piece joint and normally-loading cushion block are separated into distinct components that can be independently assembled and disassembled, allowing efficient replacement of test pieces while maintaining sealing through separate connection interfaces.
2Quantity of substance
If high-pressure water is used to increase water content in rock test pieces, then seepage is achieved, but the test pieces cannot be dried quickly and wetting-drying cycle simulation is difficult
Solution Approach 1:
The patent enables rapid wetting-drying cycles by periodically switching between water injection and air injection through the same injection holes. The system can quickly alternate between saturating the test piece with water and drying it with air flow, allowing simulation of natural wetting-drying cycles without prolonged drying times.
Solution Approach 2:
The patent uses both hydraulic (water) and pneumatic (air) systems through the injection holes to control the moisture state of test pieces. By switching between liquid water injection for wetting and air flow for drying, the system achieves rapid moisture variation necessary for simulating natural cycle conditions.
3Device complexity
If the cavity dimension is fixed for placing rock test pieces, then the structure is simple, but backlash occurs causing deflection and affecting test accuracy
Solution Approach 1:
The patent introduces adjustable or expandable cavity dimensions that can adapt to different test piece sizes. The cavity can be dynamically adjusted to minimize backlash and ensure tight fitting of test pieces during shearing, thereby improving test accuracy without requiring complex fixed-dimensional designs.
4Device complexity
If sliding friction occurs between upper and lower shear boxes during shearing, then the structure is simple, but energy is dissipated and measured shear resistance is greater than actual
Solution Approach 1:
The patent replaces sliding friction with rolling friction by introducing roller elements between the upper and lower shear boxes. This substitution minimizes energy dissipation and reduces the measured shear resistance to more accurately reflect the actual shear strength of the test piece, while maintaining structural simplicity.
5Device complexity
If cyclic vibration load is not applied during shear rheology experiment, then the equipment is simple, but the influence of blasting vibration on test pieces cannot be simulated
Solution Approach 1:
The patent integrates a cyclic vibration loading mechanism into the shear box system, enabling it to perform both conventional shear rheology tests and simulated blasting vibration effects. The same shear box structure accommodates both static shear testing and dynamic vibration loading, providing multi-functionality and enhancing simulation capability for actual working conditions.
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 shear box enhances test efficiency and accuracy by facilitating easy assembly and disassembly, maintaining high-pressure sealing, reducing friction, and simulating wetting and drying cycles, while applying cyclic vibration loads to accurately replicate blasting effects on rock test pieces.
Implementation Method 1
a sliding roller row to reduce friction
Implementation Method 2
maintaining high-pressure sealing
Implementation Method 3
When high-pressure water is injected into the shear box in a manner of radial flow
Implementation Method 4
Applying cyclic vibration load during the process of shear rheology experiment can well simulate the influence of blasting vibration
Data Source
AI summary
A shear box of shear rheology experiment of a soft rock for simulating the coupling of the rainfall seepage and blasting vibration includes an upper shear box, a lower shear box, a normally-loading indenter, a normally-loading cushion block and a test piece joint. The upper shear box is tightly connected to the lower shear box by a vertical roll. The vertical roll passes through the through holes at both sides of the upper shear box and is engaged with the lower shear box through female thread connection holes. The normally-loading indenter passes through a circular through hole and presses against the normally-loading cushion block. The first end of the test piece joint is installed into a water or gas outlet hole, and the second end of the test piece joint is directly mortised into a rock test piece.