Cone Penetration Testing (CPT)

 

DIGITAL PIEZO STATIC CONE PENETROMETER

The Digital Piezo Static Cone Penetrometer (PCPT) is a rugged and compact system; the analogue to digital conversion is performed down hole, with each cone possessing its own memory and identity that is automatically recognised when connected to the logging system.

This is a compression cone, meaning the tip resistance and sleeve friction load cells are decoupled and measure independently; this ensures that the readings from the cone are more accurate than other cones. Accurate temperature compensation assures reliable performance in soft soils and also in a situation where there is a considerable difference between air temperature and ground temperature.

Download 3066 Cone 1 HR Data Sheet

 

VIDEO CONE PENETROMETER


The Video Cone Penetrometer has a miniature colour video camera, an LED light source, micro-optic components, and a durable scratch-resistance sapphire window integrated into a Digital Piezo Static Cone Penetrometer (PCPT) cone housing. This single cone will provide standard geotechnical measurements, such as tip resistance and sleeve friction, as well a high-resolution view of the soil in real time.

The video image is displayed on a portable display screen and recorded digitally onto a DVD or hard disk. A text inserter module allows the video of the test to be stamped with the depth as it increases as well as the test identification number. Post processing provides a picture log which is imposed next to the PCPT log, helping with the correlation of the soil type.

The Video Cone is a useful tool in both Contamination Detection and Soil Classification. For environmental work, the Video Cone allows the visual detection or confirmation of the presence of non-aqueous phase liquid contaminants in the soil, such as creosote, tar and gasoline. For Geotechnical work, the Video Cone shows soil texture, grain size, colour and other soil features.

Download 3066 Cone 2 HR Data Sheet

 

SOIL MOISTURE CONE PENETROMETER

The volumetric percentage of water in soil (Soil Moisture) has become an important consideration in geotechnical and environmental design and is one of the most fundamental factors in influencing soil strength. The Soil Moisture Cone (SMC), provides real-time in-situ data logs of soil moisture and resistivity without sampling; also measuring the standard geotechnical parameters from the attached Piezocone.

The SMC takes advantage of the relationship between the soil dielectric constant and moisture, known as Topp’s Equation. This relationship is not strongly influenced by soil type and resistivity if the dielectric measurement is made above a critical frequency of approximately 30MHz. The inner two electrode rings of the cone determine the soil’s moisture content by measuring the frequency shift of a high frequency excitation signal as it passes through the soil near the surface of the module.

The outer two rings of the four electrodes are used to measure resistivity. An AC voltage signal of constant amplitude is applied across the rings. A voltage measurement, which is proportional to the current through the soil, is made across the sampling resistor.

Download 3066 Cone 3 HR Data Sheet

 

FUEL FLUORESCENCE DETECTOR CONE

The dual downhole Fuel Fluorescence Detector (FFD) detects the fluorescence produced by aromatic hydrocarbons when excited by an ultraviolet (UV) light source. The system is pushed in to the soil using CPT equipment which provides a combination of the geotechnical information from the CPT and the geoenvironmental data from the FFD. The FFD significantly reduces the time required to detect and delineate the extent of hydrocarbon fuel spills or leaking storage tanks.

By placing the dual Photomultiplier system used in the FFD downhole, it will eliminate the signal attenuation in the optical fibre, allowing weak fluorescent compounds to be detected at any depth below ground surface.

Download 3066 Cone 4 HR Data Sheet

 

INTRUSIVE MAGNETOMETER SYSTEM

The Intrusive Magnetometer System is used to survey for UXB (unexploded bombs) across a range of environments including, Rivers (and Riverbanks), Land, Harbours, Railways, Tidal and Near Shore Marine.

The probe is highly sensitive three-component Fluxgate Magnetometer System which can be deployed from a variety of platforms. The system has high detection capabilities, which in most environments has the ability to detect a 50kg WWII bomb at 2 metres from the probe. Surveys can be conducted to the maximum bomb penetration depth with high survey productivity rate.

The Computerised Intrusive Magnetometer Survey allows for the real time control of survey data with excellent data quality and is CAD compatible.

Download 3066 Cone 5 HR Data Sheet