CPTU Model Testing for Offshore Pile Soil Plug Assessment
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Solution Overview
Problem
Existing methods for assessing soil plugging and soil squeezing effects in offshore wind power pile foundations face challenges due to difficulty in data collection and analysis in complex marine environments, particularly for bearing capacity tests, which are crucial for foundation safety and stability.
Innovation Solution
A model test approach using a CPTU measurement system within a controlled model box setup to assess soil plugging and squeezing effects, involving a similarity ratio, CPTU probes, and axial force detection, allowing for systematic and accurate evaluation of these effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If on-site bearing capacity tests are conducted for offshore wind power pile foundations, then accurate assessment of foundation bearing capacity can be obtained, but data collection and analysis become difficult due to complex marine environment and too many influencing factors
Solution Approach 1:
The patent creates a scaled-down model pile foundation system that replicates the key characteristics of full-scale offshore pile foundations. By using similarity theory to design the model with appropriate geometric and material proportions, the system enables accurate assessment of soil plugging and squeezing effects in a controlled environment, avoiding the complexity of full-scale on-site testing while maintaining measurement precision through the CPTU measurement system.
2Reliability
If traditional in-situ testing methods are used for offshore pile foundations, then foundation bearing capacity can be assessed, but data collection becomes difficult and effectiveness is poor
Solution Approach 1:
The patent introduces a CPTU (Cone Penetration Test with Pressure and Temperature measurement) system as an intermediary measurement tool. This system includes a cone penetration device with sensors that directly measure soil parameters at multiple depths during pile installation and loading. The intermediary measurement system bridges the gap between complex soil behavior and assessable data, providing reliable assessment while simplifying data collection through direct in-situ measurements.
3Ease of operation
If model test approach is adopted for assessing soil plugging and squeezing effects, then data collection becomes convenient and accurate with controllable influencing factors, but requires establishing complex model test system with multiple measurement devices
Solution Approach 1:
The patent merges multiple measurement functions into an integrated model test system. The CPTU probe combines cone penetration resistance measurement, pore water pressure measurement, and temperature measurement into a single device. The model pile foundation system integrates the pile model, soil model, loading device, and measurement systems into a unified test platform. This merging reduces operational complexity while maintaining comprehensive measurement capabilities.
4Measurement precision
If CPTU measurement system is installed with multiple probes at different positions, then continuous and intuitive soil layer data can be obtained, but system setup and data processing become more complex
Solution Approach 1:
The patent segments the measurement system into multiple independent CPTU probes positioned at different locations and depths around the model pile. Each probe independently measures soil parameters at its specific location, providing segmented data that collectively represents the overall soil conditions. This segmentation enables precise measurement of soil plugging and squeezing effects at different zones while allowing independent calibration and operation of each probe, managing system complexity through modular design.
Data Source
AI summary
An assessment model design method and an assessing method for soil plugging and soil squeezing effects of an offshore wind power pile foundation are disclosed, including: S1, setting up a model box, designing a similarity ratio for a model test, and determining dimensions of a model pile; S2, setting a pile installation position in the model box, setting three measurement positioning circles, setting measurement positioning lines along radial directions of the pile installation position, intersections of the measurement positioning lines with the three circles serve as measurement points; S3, filling the model box with test soil according to specified requirements; S4, installing a CPTU measurement system, including CPTU probes placed at the measurement points and connected to a CPTU data acquisition device, and a CPTU penetration mechanism; the CPTU data acquisition device is connected to a computer; S5, installing the model pile, loading system, and axial force detection system.