Downhole & Crosshole

Vs and Vp profiling
On line FFT
Time or frequency domain and stacking
Automatic stacking, triggering
Double acting borehole energy source

Earthquake site response
Liquefaction analysis
Soil compaction control
Assessment of settlement
Assessment of ground variability
Assessment of ground stiffness

Applicable in all soils & rocks
Measures horizontally and vertically propagating wave velocities

 

CSWS & SASW

CPT Inc. is pleased to introduce our Continuous Surface Wave System (CSWS). Like conventional SASW testing this system uses surface waves to determine shear wave velocity. However, the use of a computer controlled vibrating source and multiple receivers makes CSWS more accurate and effective. The depth penetration of surface wave methods depends on the velocity of the material being tested. CSWS testing can penetrate to depths of 10 to 15 metres in soft soils, and up to 30 metres in stiff soils.

Frequency Controlled High Energy Vibrator (5 to 600Hz with 0.1Hz resolution)
Windows based computer controlled test system
Simultaneous measurement of surface wave phase using six geophones and real time statistical assessment of the data
Real time display of signal frequency content and calculated stiffness profile

Vs and Vp profiling
Earthquake site response
Liquefaction analysis
Soil compaction control
Settlement Assessment
Assessment of ground variability
Assessment of ground stiffness

Economical - Surface wave testing is much more cost effective than seismic cross-hole and down-hole testing
Fast - A complete profile can be completed in under 2 hours
Accurate - The computer controlled source and multiple receivers generate accurate and repeatable results
Portable - The system is normally carried in a 4x4 truck but is easily transported anywhere
Non-Intrusive - The procedure minimizes site impact