Interpretation of CPTU tests carried out in lacustrine Mexico City soft clay

摘要

The use of the piezocone test (CPTU) for geotechnical site investigation offers direct field measurements on geostratigraphy and soil behavior. Its execution time is much less in comparison with the conventional drilling and sampling procedures commonly used in Mexico and offers a great opportunity to accelerate the field jobs, thus reducing operation costs. Recently, these tests were used in a broadly explored area in the soft lacustrine deposits of Mexico City Valley. In this paper, geotechnical design parameters obtained from CPTU tests (q_T, f_s and u_2) and dissipation tests are evaluated for the lacustrine clays of this area, using methods based on cavity expansion theory (CE) and critical state (CS), and placed in comparison with the results of laboratory tests on undisturbed soil samples.