Confining Pressure-Adjustable Soil Deformation Test System
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Solution Overview
Problem
Current methods for vacuum preloading in soft soil foundation treatment, such as coastal reclamation and airport construction, face challenges in accurately simulating the formation and deformation mechanisms of soil columns due to confining pressure and groundwater effects, leading to insufficient accuracy in test data.
Innovation Solution
A confining pressure-adjustable test and observation system that includes a soil vacuum consolidation system, a vacuum drive system, a confining pressure system, and a monitoring system, allowing for precise simulation of soil conditions by adjusting confining pressure and simulating groundwater infiltration, enabling direct observation of soil column formation during vacuum preloading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a traditional test system without confining pressure adjustment is used, then the test setup is simple, but the test data accuracy is insufficient due to inability to simulate real soil state
Solution Approach 1:
The test system incorporates adjustable confining pressure capability, transforming a static test setup into a dynamic one that can adapt to different test conditions. The confining pressure can be adjusted during testing to simulate various real-world soil states, thereby improving measurement precision without requiring multiple fixed test setups.
Solution Approach 2:
The system enables change of confining pressure parameter during testing to accurately simulate different underground environments. By adjusting the confining pressure parameter, the test can replicate real soil conditions more faithfully, improving test data accuracy while maintaining a single versatile test platform.
2Reliability
If confining pressure is not simulated in the test model, then the test setup is simpler, but the simulation of real soil state becomes inaccurate
Solution Approach 1:
The test model employs pneumatic or hydraulic systems to generate and control confining pressure on the soil sample. This approach reliably simulates the three-dimensional stress state of underground soil by using fluid pressure transmission, achieving high simulation accuracy while keeping the pressure application mechanism relatively simple and controllable.
3Loss of information
If groundwater effects are not considered, then the test setup is simpler, but the understanding of soil column formation mechanisms is insufficient
Solution Approach 1:
The test system introduces groundwater as an intermediary element that interacts with the soil and drainage boards during vacuum preloading. This allows observation of how groundwater affects soil column formation and drainage efficiency, providing complete mechanism understanding without significantly complicating the core test setup.
4Loss of information
If direct observation of soil column formation is not implemented, then the test setup is simpler, but the causes of soil column formation cannot be identified
Solution Approach 1:
The test system employs visual observation methods where soil particles or indicators undergo color changes or visibility changes during deformation and soil column formation. This allows direct observation of formation mechanisms through color or optical changes without requiring complex imaging or sensing systems.
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 system provides high-precision, continuous measurement of soil deformation and movement, closely matching site conditions, allowing for real-time monitoring of pore water pressure and vacuum degrees, thus improving the accuracy of test data and understanding of soil column formation mechanisms.
Implementation Method 1
vacuum preloading
Implementation Method 2
confining pressure system
Data Source
AI summary
Disclosed is a confining pressure-adjustable test and observation system for soil deformation features during vacuum preloading. The system includes a soil vacuum consolidation system, a vacuum drive system, a confining pressure system and a monitoring system; where the soil vacuum consolidation system includes a model box filled with test soil, the confining pressure system is arranged in the model box, two sides of the model box are provided with slide plates, and the slide plates on two sides are provided with expansion control cavities at two side ends of the model box correspondingly, and a corrugated air bag is arranged in the expansion control cavity and is connected to an external air pump and an air bag air pressure control device through a pipeline; the test soil in the model box is covered with geotextile, and the geotextile is covered with a vacuum film.