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CPT Interpretation March 2020
Courtyard Marriott Santa Ana
8 MacArthur Pl
Santa Ana, CA 92707
(714) 668-9993

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Friday, March 06, 2020, 8:00 AM - 4:00 PM PDT
Category: Courses & Seminars

CPT Interpretation: Your CPT Bootcamp

You've just received a CPT report with some squiggly lines and data. Maybe even collected dissipation tests and shear wave data. Now what??

Join us for a half or full day short course with the CPT "Guru" himself, Dr. Peter K. Robertson, to get all your questions answered. Dr. Robertson will use example data and walk you through how to analyze CPT data using commercially available software. No license required! Even if you have your own spreadsheets, this course will help you identify poor quality data, what can go wrong, what it means when things don't "agree" and more.

From interpretation of dissipation tests, seismic data, to liquefaction; we'll fit as much as we can into this "CPT boot-camp."

Join us on Friday March 6 in Orange County, CA for this half-day short course including a breakfast and lunch at the host hotel, Courtyard Marriott. Parking is included in your registration for all attendees. Please plan on bringing a laptop computer so you can follow along with the real-world examples using the popular Geologismiki software programs, CPeT-IT (CPT Interpreation) and Cliq (Liquefaction analysis).

This is a hands-on demonstration so please bring a laptop with the software or a trial version installed. Visit Geologismiki's website to download a free trial.

CPeT-IT takes Cone Penetration Test raw data and performs basic interpretation in terms of Soil Behaviour Type (SBT) and various other geotechnical parameters using the current published correlations based on the comprehensive review by Lunne, Robertson and Powell (1997), as well as recent updates by Professor Robertson.

CLiq is a soil liquefaction software that addresses advanced issues such as cyclic softening in clay-like soils and thin layer/layer transition zone detection. CLiq provides results and plots for each calculation step, starting with the basic CPT data interpretation through to final plots of factor of safety, liquefaction potential index and post-earthquake displacements, both vertical settlement and lateral displacements. CLiq provides consistent output results by applying the state-of-the-art NCEER method (Youd et al, 2001) along with the calibrated procedures for post-earthquake displacements by Zhang et al (2002 & 2004). It also includes the latest assessment procedure developed by Robertson (2009) which is applicable to all soil type combining a check for cyclic liquefaction (sands) and cyclic softening (clays)

A unique 2D feature provides a means of creating colorful contour maps of the overall liquefaction potential index (LPI) and post-earthquake vertical settlements in plan view thus allowing the user to visualize the spatial variation of liquefaction potential and settlements across a site. The variations of calculated post-earthquake settlements across a site allow estimates of differential settlements for a given site and design earthquake.

A parametric analysis feature allows the user to vary both the earthquake magnitude and surface acceleration to evaluate the sensitivity of both the overall liquefaction potential index and post-earthquake settlements as a function of earthquake loading and results are presented in a 3D graphical form.


7:30-8:00am Buffet breakfast & registration at Courtyard Marriott Santa Ana (off 55 freeway at MacArthur)

8:00-11:30am Introduction to CPT

  • Equipment & data collection
  • Basic interpretation and soil behavior types
  • Loading CPT data into CPeT-IT
  • Simplified interpretation of CPT data using CPeT-IT (SBT, Ic and soil parameters)

11:30-12:30 Lunch Break

12:30-4:00pm Advanced Interpretation of CPT

  • Pile design using CPeT-IT
  • Shallow foundation design using CPeT-IT
  • Liquefaction using CLiq

Morning and afternoon sessions will also include a 20-30min coffee break.


Includes continental breakfast at hotel, coffee, lunch and parking. Free software trial valid for 30-days.

Half-day Members: $180, Non-members: $280

Full-day Members: $300, Non-members: $420

Registration is closed.

Thank you to our sponsor, Gregg Drilling LLC


Contact: Kelly Cabal, [email protected] (949) 391-2436 with any questions.