Piezocone Penetration Test Vane Shear Test Cptu Test Pore Pressure CPT for Geotechnical Investigation and Testing

Product Description

Piezocone Penetration Test Vane Shear Test CPTU Test Pore Pressure CPT for Geotechnical investigation and testing

What is Advantages of CPTU testing?
 

• fast and continuous profiling
• cost-effectiveness and high productivity
• operator-independent results
• a solid theoretical background is necessary to interpret results
• perfect for soft soil.
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What is  CPTu system consists?

 CPTu system consists of several key components:

• Cone Penetrometer - records tip resistance and sleeve friction.

• Piezocone (Pore Pressure Sensor) - detects pore water pressure during penetration.

• Hydraulic System - pushes the probe vertically into the soil at a constant speed.

• Data Logger and Cables - capture and store data in real time.

The ultimate value of any geotechnical investigation lies not in the raw data collected, but in the engineering decisions that data enables. The CPT-1 serves as the critical bridge between field measurements and design outcomes, capturing the cone penetration and piezocone data that directly inform foundation selection, settlement predictions, and construction methodologies. This instrument does not simply record numbers; it generates the quantitative evidence that engineers rely upon to design safe, economical, and constructible foundations. By delivering accurate, reliable, and immediately interpretable CPT and CPTU data, the CPT-1 empowers engineers to make confident decisions with a clear understanding of subsurface conditions.

Cone Penetration Test data provides the foundation for bearing capacity analysis. The cone tip resistance (qc) measured by the CPT-1 directly correlates with the ultimate bearing capacity of shallow foundations, enabling engineers to estimate allowable bearing pressures without the expense and time of traditional sampling and laboratory testing. For deep foundations, CPT data drives the calculation of pile shaft friction and end bearing capacity, allowing designers to optimize pile lengths and diameters to achieve required load capacities with minimal material waste. The friction ratio (Rf = fs/qc), derived from the dual-bridge measurements, serves as a reliable soil classification index, enabling engineers to distinguish between sand, silt, and clay layers and assign appropriate strength and compressibility parameters to each stratum. This classification capability is particularly valuable in heterogeneous soil profiles where conventional boring and sampling would miss thin, critical layers.

 

Piezocone data adds the dimension of time-dependent behavior to the engineering assessment. The pore pressure measurements captured during CPTU penetration provide immediate indication of soil drainage conditions - positive pore pressures indicating contractive behavior in clays, negative pressures suggesting dilative response in dense sands. The dissipation test data, recorded by the CPT-1 over logarithmically spaced time intervals, enables direct estimation of the coefficient of consolidation (cv), a parameter essential for predicting the rate of settlement under applied loads. This information is critical for designing preloading programs, evaluating the performance of vertical drains, and scheduling construction activities to accommodate anticipated settlement rates. The equilibrium pore pressure determined from dissipation tests confirms groundwater conditions, including the presence of artesian pressures that could affect excavation stability or basement design.

The integration of CPT and CPTU data enables comprehensive site characterization. By conducting soundings with both conventional and piezocone probes, engineers can correlate penetration resistance with pore pressure response to develop a complete understanding of soil behavior. The CPT-1's ability to store and export both data types within a unified file structure facilitates this integrated analysis. The included static testing software allows engineers to overlay CPT and CPTU data, compare results from multiple boreholes, and generate cross-sections that illustrate the spatial variability of soil properties across the site. This visualization capability is invaluable for identifying weak zones, permeable layers, and stratigraphic anomalies that could affect foundation performance.

Operational efficiency translates directly to project economics. The CPT-1's rapid data acquisition - sampling every 10cm at a speed of 10ms per point - enables productive field programs that cover more ground in less time than traditional investigation methods. The instrument's automatic data storage eliminates the need for manual note-taking during testing, reducing the potential for transcription errors and freeing the operator to focus on equipment control and site safety. The USB flash drive data export, combined with the included PC software, enables rapid report generation that keeps pace with the field program, allowing design decisions to proceed without delay. This efficiency is particularly valuable on fast-track projects where schedule compression is essential to meet construction deadlines.

The following comprehensive specifications detail the operational capabilities of the CPT-1 :
 

Parameter Category	Technical Specification	Engineering Value
Core Processor	Microcontroller	STM32F103VET6, 16-bit
Program Memory	Flash storage	512KB
Data Processing RAM	Static memory	32KB
Data Storage	Flash memory	2MB
Display	Screen type	7-inch TFT color LCD
Display Area	Active region	156 × 89 mm²
Input Channels	Differential inputs	3 channels
Input Range	Per channel voltage	-20mV to +20mV
Linearity Error	System accuracy	≤ ±0.1%
Sampling Time	Acquisition speed	10ms
Depth Interval	Standard (customizable)	10cm (minimum 2cm)
Max Depth per Borehole	Penetration limit	99.9m
Single-Bridge Capacity	Data length	≈100,000 meters
Dual-Bridge Capacity	Data length	≈50,000 meters
Three-Channel Capacity	Data length	≈35,000 meters
Max Borehole Files	Total records	350 holes
CPT Output	Primary parameters	qc, fs, Rf
CPTU Output	Primary parameters	qc, fs, u, dissipation curve
Engineering Applications	Design uses	Bearing capacity, pile design, settlement prediction, consolidation analysis, groundwater assessment
Depth Sensor	Type	Pull-wire photoelectric encoder
Data Export	Interface	USB flash drive
Included Software	Post-processing	Static testing software for charting, editing, reporting
Battery	Rechargeable	7.4V, 5200mAh lithium
Power Consumption	Field operation	≈2W
Operating Temperature	Ambient range	0ºC to 40ºC
Unit Weight	Main instrument	≈960g