Available Methods of Testing

 

 

 

 

CF Cones

•
  • •Measure cone tip resistance and cone friction
  • •Used to derive soil type and geotechnical parameters

Piezo-cone

•
  • •Measures cone tip resistance, cone friction and porewater pressure
  • •Able to carry out Dissipation Tests
  • •Used to derive soil type and geotechncial parameters e.g coefficient of consolidation
 

Mostap Sampling

•
  • •Near continuous soil sampling
  • •Takes 66mm diameter undisturbed samples
  • •Samples can be used for visual classification and lab testing e.g shear strength, contamination, consolidation.
 

Conductivity Cone

•
  • •Measures the exchange of ions in groundwater and saturated soil layers (also the tip resistance and cone friction).
  • •Used to: detect sand or clay layers; tracing fresh and saturated salt water-carrying layers in coastal areas; detecting contamination in saturated or partly saturated soils which have a dipole character, such as heavy metals.

Envirocone

•
  • •Measures pH, redox potential and temperature with depth (also the tip resistance, cone friction and pore-water pressure)
  • •Can be used on contaminated sites to map leacheate and contamination plumes.
•

Seismic Cone

•
  • •Dual seismic cone for measurement of shear wave velocities (also the tip resistance and cone friction)
  • •Can carry out cross-hole seismic cone tests with two rigs
  • •Enables the determination of the dynamic shear modulus (Gmax)

Video Cone

•
  • •Real time video image of ground during penetration
  • •Enables you to see the variation in soil
  • •Can be used to identify contamination within soil
  • Click here for more information

Wastap

•
  • •Water and gas sampling using the CPT method
  • •Used to take water or gas samples at the desired test level without disturbance.
  • •Can be used to sample for contaminants in groundwater

Delft Sampling

•
  • •A continuous soil sampling system
  • •Designed to be one continuous operation, without the need to remove the rods in between samples

Cone pressure-meter

 
•
  • •Used as in addition to the standard CPT
  • •Reliable measurement of in-situ strength and load deformation behaviour
  • •Enables derivation of Undrained Shear Strength, Shear Modulus, Effective Horizontal Stress and Relative Density

Hydrocarbon Cone

 

Magnetometer Cone

 
  • •Designed as a push in system to find unexploded ordnance
  • •Used as a safe method for unexploded ordnance detection, whether as a result of conflict or weapons testing, unlocking key development land

Soil Moisture Probe

The soil Moisture Probe (SMP) is installed directly behind the electric cone and permits the simultaneous acquisition of resistivity, soil moisture and geotechnical data. The SMP comprises two ring shaped and carefully isolated electrodes and an Application-Specific Integrated Circuit (ASIC). The ASIC uses synchronous detection for accurate measurements, free from electric interference Dielectric soil properties, capacitance and electrical conductivity, are governed mainly by the water content of the soil mass. By measuring these parameters between two electrodes, with the soil dielectric in between, the soil moisture can thus be determined.

The capacitance of dry soil is determined by its dielectric constant. For dry soil this constant is of the order of 3 to 6 and for water the constant is 80, that is, the capacitance between the two electrodes is dominated by the volume fraction of water.

In polluted soils non-aqueous phase liquids (NAPL’s), such as oil or chlorinated solvents, will replace part of the water in the soil matrix. As they do not dissolve easily in groundwater, they will occur as a film of pure product, often just above the groundwater table. Dense NAPL’s such as chlorinated hydrocarbons, which are denser than water, will penetrate the groundwater table and are typically found on top of impermeable layers. These pollutants affect the dielectric properties of the soil significantly and are detectable using the Soil Moisture Probe. Graph above of water content v. dielectric constant. By using this cone technique, time and cost can be saved.


Corecone

Lankelma Seacore Offshore Limited (LSO) has developed a “Corecone” CPT and rotary coring system.

LSO offer this service, which can be used of offshore, near shore and land investigations. The drilling system is the Geobore wire line drilling system. This is a specialist drilling system which enables a cased hole to be drilled and for cores to be taken in soils and rock. These samples are recovered to deck utilizing the fishing tool.

The new development is a tool, which can be deployed to the base of the hole inside the casing as a wireline tool. This latches in to the Geobore latching system. This tool is deployed with a combined lifting and communication umbilical. This is attached to winch for recovering the tool on completion of the CPT. The surface logging system for real time recording of the CPT data is connected via the umbilical.

The system has been designed to offer the full range of cones.

The advantage of this system is that an offshore style borehole can be performed whereby it is possible to alternate sampling and CPT testing within the same borehole. It also enables Copt’s to be performed at any depth within a borehole, where a conventional surface CPT can reach refusal in very dense or cemented layers, the borehole can be advanced through these strata utilizing drilling techniques and Copt’s then performed in suitable strata below.

 

Gamma Cones

Click here for more information

 

Additional Services

MOBILE OFFICE

Each rig has its own mobile office allowing it to email and fax, allowing data to be sent to the office for immediate processing

 

 

Lankelma CPT Services Guide to CPT News Projects

Testing Methods Rigs News Job Opportunities Contact Us