Full-flow Penetrometer with Overlying Pressure Loading for Clay Testing
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Solution Overview
Problem
Traditional full-flow penetrometers face challenges in accurately measuring the strength and strain softening parameters of high-strength saturated clay samples, particularly in segmented core samples from marine field investigations, due to incomplete overlying pressure application, leading to inaccurate soil strength assessments.
Innovation Solution
A device comprising an overlying pressure loading system and a full-flow penetration system, utilizing a lever-loading mechanism to apply controllable pressure, ensuring reliable measurement of peak strength, strain softening parameters, and fully remolded strength by integrating a full-flow penetrometer with a cylindrical rigid box and annular pressurizing frame, allowing for cyclic penetration and extraction tests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional full-flow penetrometer is used on segmented core samples without overlying pressure, then the test operation is simple, but the full-flow mechanism cannot be established and measurement accuracy deteriorates
Solution Approach 1:
The device applies overlying pressure to the soil sample before the penetration test begins. The rigid box with movable top cover and lever-loading mechanism pre-compresses the soil sample to establish proper confining pressure conditions, ensuring the full-flow mechanism can be established during subsequent penetration testing of segmented core samples.
Solution Approach 2:
The rigid box acts as an intermediary device between the penetrometer and the segmented core samples. It provides a controlled environment with adjustable overlying pressure that enables the full-flow mechanism to develop properly during penetration, while the lever-loading mechanism serves as an intermediary to apply and control the pressing force on the soil sample.
2Device complexity
If high-strength saturated clay samples are tested without overlying pressure, then the test setup is simple, but cavity formation occurs and measurement reliability deteriorates
Solution Approach 1:
The device applies overlying pressure to the soil sample before the penetration test begins. The rigid box with movable top cover and lever-loading mechanism pre-compresses the soil sample to establish proper confining pressure conditions, ensuring the full-flow mechanism can be established during subsequent penetration testing of segmented core samples.
Solution Approach 2:
The rigid box acts as an intermediary device between the penetrometer and the segmented core samples. It provides a controlled environment with adjustable overlying pressure that enables the full-flow mechanism to develop properly during penetration, while the lever-loading mechanism serves as an intermediary to apply and control the pressing force on the soil sample.
3Measurement precision
If lever-loading mechanism is added to apply overlying pressure, then measurement accuracy for high-strength soil improves, but device complexity increases
Solution Approach 1:
The rigid box acts as an intermediary device between the penetrometer and the segmented core samples. It provides a controlled environment with adjustable overlying pressure that enables the full-flow mechanism to develop properly during penetration, while the lever-loading mechanism serves as an intermediary to apply and control the pressing force on the soil sample.
Solution Approach 2:
The lever-loading mechanism allows for adjustable overlying pressure parameters. By changing the pressing force applied to the soil sample, the device can adapt to different soil strength conditions, enabling accurate measurement of both high-strength and low-strength soils through parameter adjustment rather than requiring multiple specialized devices.
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 accurate and reliable measurement of soil strength and strain softening parameters in high-strength clay samples, expanding the application range of full-flow penetrometers to include high-strength soils and core samples, providing critical data for engineering facility design and stability evaluation.
Implementation Method 1
The working mechanism the traditional consolidometer is based on lever. The overlying pressure on the soil samples is by adding the weights on the end of the lever.
Implementation Method 2
A device comprising an overlying pressure loading system and a full-flow penetration system, utilizing a lever-loading mechanism to apply controllable pressure
Data Source
AI summary
A device for measuring strength and strain softening parameters of a saturated clay sample based on full-flow penetration belongs to the technical field of geotechnical, geological and environmental research. The device mainly comprises two parts: an overlying pressure loading system and a full-flow penetration system. The present invention mainly aims at the problem of incomplete backflow of the soil in the measurement of soil strength and strain softening parameters with a full-flow penetrometer for saturated clay, and applies the working principle of a traditional consolidometer to vertically pressurize a soil sample to ensure the backflow of the soil, thereby improving the applicability of the full-flow penetrometer in the measurement aspect of the soil strength and the strain softening parameters and having important practical value for test research and marine engineering design.