Grouting Device for Fractured Rock Under Coupled Stress-Temperature-Water Pressure
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Solution Overview
Problem
Existing rock mechanics testing equipment primarily focuses on single factors, failing to accurately simulate the coupled effects of stress, temperature, and water pressure on rock crack propagation, which is crucial for preventing water gushing disasters in deep mines.
Innovation Solution
A grouting and water-plugging device for fractured rocks in a mine coupling state, comprising a pressurizer, reservoir, test box, and grouting pump, with sensors and valves to apply controlled axial and transverse pressures and temperatures, allowing for comprehensive testing of crack propagation and plugging effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing test equipment focuses on single factor testing, then the test setup is simple, but it cannot accurately simulate the coupled effects of stress, temperature, and water pressure on rock crack propagation
Solution Approach 1:
The patent combines multiple single-factor testing systems into one integrated coupled effect testing system. The stress loading system, temperature control system, and water pressure injection system are merged into a single test bench that can apply all three factors simultaneously to rock specimens, enabling accurate simulation of deep mine conditions where stress, temperature, and water pressure act together to influence crack propagation
Solution Approach 2:
The test equipment is designed with multi-functionality to handle various testing requirements. The same test bench can perform stress-temperature-water pressure coupled effect tests, single factor tests, and grouting effect verification tests. The system includes universal components such as the loading frame, temperature control chamber, and fluid injection system that can be configured for different test scenarios
2Adaptability or versatility
If multiple sensors and control systems are added to simulate coupled effects, then the testing capability is improved, but the device complexity and operational difficulty increase
Solution Approach 1:
The patent introduces a control computer as an intermediary that coordinates all testing parameters and data acquisition. The control computer receives input from sensors measuring stress, temperature, water pressure, and crack propagation, then automatically adjusts the loading system, temperature control, and fluid injection to maintain desired test conditions. This centralized control simplifies operation by eliminating the need for manual coordination of multiple systems
Solution Approach 2:
The testing system incorporates feedback mechanisms through sensors that continuously monitor stress levels, temperature, water pressure, and crack propagation patterns. This real-time feedback is fed back to the control system, which automatically adjusts test parameters to maintain precise control over the coupled effects being applied to the rock specimen, ensuring accurate simulation of deep mine conditions
3Reliability
If grouting testing is conducted under coupled conditions, then the verification of plugging effectiveness is improved, but the test procedure complexity increases
Solution Approach 1:
The patent implements preliminary crack creation and characterization before grouting testing. The system first applies coupled stress-temperature-water pressure conditions to induce and characterize cracks in the rock specimen, establishing a known initial state with measured crack propagation patterns. This preliminary action provides a baseline for comparing against post-grouting conditions, making the effectiveness verification more reliable
Solution Approach 2:
The testing procedure is segmented into distinct phases: (1) crack induction under coupled effects, (2) crack characterization and measurement, (3) grouting material injection, (4) post-grouting testing under same coupled conditions, and (5) effectiveness comparison. This segmentation allows each phase to be optimized and controlled independently, reducing overall procedure complexity while maintaining reliability
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 flexible simulation of environmental conditions, precise application of pressures, and verification of grouting effectiveness, providing a reliable basis for safe mining by accurately stimulating crack propagation patterns under coupled stress-temperature-water pressure conditions.
Implementation Method 1
The pressurizer is configured to push the pressing-water plate to apply axial pressure to water flow
Implementation Method 2
left and right struts are configured to push the transverse force exerting plate to apply transverse pressure to a rock specimen
Implementation Method 3
The reservoir includes a temperature sensor and a pressing-water plate
Implementation Method 4
The test box includes a transverse force exerting plate, a longitudinal force exerting plate, a stress sensor and the temperature sensor
Data Source
AI summary
The present disclosure provides a grouting and water-plugging device for a fractured rock in a mine coupling state and a test method, and relates to the technical field of rock mechanics testing. The device includes a pressurizer, a reservoir, a test box, and a grouting pump. The reservoir includes a temperature sensor and a pressing-water plate. The pressing-water plate is connected to the pressurizer through a pressurizing rod. A pressure measuring pipe and a drainage pipe are installed on an outer side of the reservoir. The reservoir is connected to a water pump through a water injection pipe. The test box includes a rock, a transverse force exerting plate, a longitudinal force exerting plate, a stress sensor and the temperature sensor. The longitudinal force exerting plate is provided with multiple water through holes. A sliding box door is hinged to a front wall of the test box. The pressure measuring pipe and the drainage pipe are installed on a rear wall of the test box. The rear wall of the test box is connected to the grouting pump through a grouting pipe. A water pressure gauge is installed on the grouting pipe. Valves are installed on the grouting pipe, the pressure measuring pipe, the water injection pipe, and the drainage pipe. The device can be used to conduct a test, simulating coupling conditions of stress-temperature-water pressure in a mine, for a rock, and to verify the effectiveness of water plugging.