High-Water Pressure Trapdoor Test Device for Soil Arching
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Solution Overview
Problem
Current geotechnical engineering model tests primarily focus on single-phase dry soil conditions, neglecting the two-phase soil arching effect under high-water pressure, and existing devices fail to maintain consistent pressure and account for material pretreatment, limiting the study of soil arching evolution and material utilization.
Innovation Solution
A high-water pressure trapdoor model test device incorporating PIV analysis, soil pressure sensors, pore water pressure gauges, and a pressurizing unit within a test box with a trapdoor mechanism, allowing for the study of soil arching under high-pressure conditions by controlling gas pressure and utilizing pretreated materials with bulges for maximum strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing test devices are used for single-phase dry soil study, then the device structure is simple, but it cannot study the two-phase soil arching effect under high-water pressure
Solution Approach 1:
The test device is divided into separate functional modules: a test box for containing soil and liquid materials, a pressurizing unit for controlling gas pressure, a trapdoor module for applying controlled displacement, and a data acquisition system for measuring soil pressure and pore water pressure. This segmentation allows the device to study two-phase soil arching effects while maintaining manageable complexity through modular design.
Solution Approach 2:
Gas is introduced as an intermediary medium between the pressurizing unit and the soil-liquid system. The gas pressure serves as a mediator to simulate high-water pressure conditions and control the two-phase environment, enabling the study of soil arching effects under controlled pressure conditions without directly applying liquid pressure.
2Productivity
If materials are not pretreated in existing devices, then the device operation is simple, but the utilization rate of material performance is low
Solution Approach 1:
Soil materials are pretreated before being placed in the test box to achieve uniform density and optimal mechanical properties. The soil is compacted in layers and allowed to settle before testing, ensuring that the material performs at its maximum potential during the soil arching experiment, thereby increasing the utilization rate of material performance.
3Reliability
If pressure cannot be maintained in existing devices, then the device structure is simple, but the study of soil arching evolution under high pressure is limited
Solution Approach 1:
The data acquisition system continuously monitors gas pressure, soil pressure, and pore water pressure during the experiment. This feedback information is used to adjust and maintain stable pressure conditions throughout the test, ensuring reliable study of soil arching evolution under high pressure while providing real-time data for analysis.
4Adaptability or versatility
If sealing is not considered in existing devices, then the device structure is simple, but it is difficult to explore soil arching evolution under two-phase conditions
Solution Approach 1:
The test box is designed with sealed walls and a removable lid that creates a closed system. This sealing structure allows the containment of both soil and liquid materials under controlled gas pressure, enabling the study of two-phase soil arching effects while maintaining a relatively simple overall device structure through effective sealing design.
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 the exploration of soil arching formation and evolution mechanisms under high-water pressure, allows for the use of various liquid materials, and maximizes material utilization by maintaining consistent pressure and accounting for material pretreatment, enhancing the understanding of soil behavior.
Implementation Method 1
a set space allowing a gas to be filled therein is reserved between the liquid material and an inner wall of a top cover of the box body of the test box, the pressurizing unit is connected to the test box and is used for filling the gas in the test box
Implementation Method 2
the PIV analysis unit is used for recording the development and intensification law of soil arching effect within the test box
Implementation Method 3
the second soil pressure sensors and the pore water pressure gauges are arranged in the solid material
Data Source
AI summary
The invention provides a high-water pressure trapdoor model test device and a use method thereof. The high-water pressure trapdoor model test device includes a PIV analysis unit, a liquid material, a solid material, pore water pressure gauges, first soil pressure sensors, second soil pressure sensors, third soil pressure sensors, a test box and a pressurizing unit. A box body of the test box is provided with an opening sealed by a base plate, a hole is formed in the base plate, a trapdoor is arranged at the hole, the third soil pressure sensors are arranged in the trapdoor, the first soil pressure sensors are arranged in the base plate, the solid material is placed on the base plate, the second soil pressure sensors and the pore water pressure gauges are arranged in the solid material, and the liquid material is placed on the solid material.