Abstract
Abstract The paper deals with the methodology of performing and interpretation of seismic cone penetration test (SCPT). This type of test is used to determine velocity of the seismic wave in the soil medium. This study is focused on shear wave. The wave is triggered on the ground surface by hitting an anvil with a sledgehammer. Then, vibrations induced at different depths are measured. Based on recorded measurements wave velocity (Vs) and thus also small strain shear modulus Gmax may be calculated. An interpretation of exemplary seismic test results is presented. Crossover and cross-correlation methods are discussed and another, more adequate one is featured and then applied in the interpretation example. Conditions for correct test performance and interpretation are discussed.
Highlights
Commonly used CPTU probes are often equipped with additional measuring attachments to determine velocity of seismic waves
A methodology of in situ seismic test using a GEOTECH 220-04 CPTU penetrometer equipped with a seismic module is presented
Seismic test (SCPT) consists in triggering a seismic wave in the soil medium by hitting an anvil resting on the ground surface with the use of a sledgehammer
Summary
Commonly used CPTU probes are often equipped with additional measuring attachments to determine velocity of seismic waves. Two basic types of seismic waves can be distinguished: compression wave and shear wave. The former is referred to as the P-wave (primary wave) and the latter as the S-wave (secondary). Elastic constants (Emax, Gmax, ν ) can be calculated on the basis of determined wave velocities. Elastic parameters derived are used in a wide range of analyses, especially associated with problems of foundation engineering. A methodology of in situ seismic test using a GEOTECH 220-04 CPTU penetrometer equipped with a seismic module is presented . The interpretation procedure with the use of SEISMIC-pro software is discussed and example results and their interpretation are presented.
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