CLiq is software for the assessment of soil liquefaction using CPT/CPTU data. CLiq was developed in collaboration with Gregg Drilling & Testing Inc., a leading company in site investigation and CPT, and Professor Peter Robertson, author of the method used in the software. Soil liquefaction assessment software from CPT/CPTU data.

CLiq provides users with an easy to use graphical environment specifically tailored for CPT and CPTU data. This new software 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).

When the software starts it will always display a new empty project. In order to begin entering CPTU data you must first define the unit system that you wish to use. By default CLiq uses the SI unit system. Defining the unit system prior to inserting any data will allow you to easily switch between the supported unit systems, applying automatically all required transformations.

After you have specified the unit system for the current project you can import CPTU data from an ASCII data file by clicking on the menu Data and selecting the Add CPTU file command (alternatively you may click on the button located on the CPT file manager toolbar).

By default, CLiq will prompt you to read data from a text file. If you are a licensed CPeT-IT user you may import CPTU files from a CPeT-IT project file as described here. If you wish the new data files to be included in you current working project the Add to current project check box must be checked (applies only when importing data from CPeT-IT projects).

CLiq uses established empirical correlations to estimate geotechnical parameters for basic data interpretation. It also allows the user to modify constants that are essential for the liquefaction calculation procedure. These input parameters are applied to each single CPTU file in the current project, giving the ability to perform analysis with different set of parameters for the various files. In order to preview and/or modify the calculation parameters, first select a CPTU file and then from the Data menu select the Analysis properties command (alternatively you may click on the button located on the CPT file manager toolbar).

CLiq Features:
1. Concise results based on the Youd et al. (2001) CPT procedure
2. Latest assessment procedure based on Robertson (2009) applicable to all soil types (cyclic liquefaction and cyclic softening)
3. Imports raw CPTU data from any ASCII text file
4. Supports input and output in both the SI and Imperial unit systems
5. Basic interpretation results based on the comprehensive review by Lunne, Robertson, Powell (1997) and Robertson (2009, 2010)
6. Tabular presentation of all steps of the liquefaction assessment procedure
7. Graphical presentation of all steps of the liquefaction assessment procedure
8. Parametric analysis tool
9. 2D plain map creation feature for LPI or vertical settlements
10. Analytic reports

The license of this software is Free Trial Software, you can free download and get a free trial.