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Showing 1 to 17 of 17 for “"Penetrometers"”.
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Advancement of Using Portable Free Fall Penetrometers for Geotechnical Site Characterization of Energetic Sandy Nearshore Areas
Portable Free Fall Penetrometers (PFFPs) are lightweight tools used for rapid and economic characterization of surficial subaqueous sediments. PFFPs vary in weight, shape and size with options for using add-on units. The different configurations enable deployments in various environments and water …
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Advancements for the Numerical Simulation of Free Fall Penetrometers and the Analysis of Wind Erosion of Sands
… essential. In particular, the usage of free-fall penetrometers (FFP) is appealing due to their portability and robustness. The sediment properties obtained with this type of testing can later be used to assess wind erosion susceptibility by determining, for example, the wind velocity to initiate …
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Development of the Spectral-Analysis-of-Body-Waves (SABW) method for downhole seismic testing with boreholes or penetrometers
… downhole seismic tests with boreholes, cone penetrometers or flat-plate dilatometers by developing a frequency-domain analysis method which overcomes many of the disadvantages of time-domain analyses. The frequency-domain method is called the Spectral-Analysis-of-Body-Waves (SABW) method. The …
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An experimental method for visualizing undrained shearing failure in a transparent soft clay surrogate
… shear vane and the T-bar, ball, and cone penetrometers and provided the first non-invasive in situ images of deformation patterns. Previous attempts to visualize the shear failure surfaces of a rotating vane or penetrometers included significant disturbance of the soil sample or methods of …
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Determination of geotechnical properties of seafloor sediment using a free fall penetrometer
… approach that can expand the usage of free fall penetrometers.</p><p>Rapid penetration with rigid probes in saturated sediments usually results in an increase in measured penetration resistance. This effect, called the strain rate effect, was studied for soft fine-grained sediments by formulating …
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In-Situ Geotechnical Characterization of Soft Estuarine Surficial Sediments Using a Portable Free Fall Penetrometer
… transport and deposition. Portable free fall penetrometers have been previously used to provide initial information on sediment type, strength, and stratification, but challenges with the calibration of empirical parameters such as the cone factor and strain rate factor hampered the derivation …
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Development and testing of an application specific force sensor for snowpack assessment
Snow penetrometers create a specific application for a force sensor with specifications that are over achieved at great cost when using traditional load cells. A moderately priced, compact force sensor suitable for this application does not exist, and numerous force-sensing technologies were …
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A Method for Interpreting the In-Situ Consolidation State of Surficial Seabed Sediments using a Free-Fall Penetrometer
Free-fall penetrometers (FFP) are useful instruments for the rapid characterization of seabed sediments. However, the interpretation of FFP data remains largely a skilled task. In order to increase the reliability of results obtained using these instruments, in both expert and non-expert hands, it …
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Investigation of Pore Pressures During High-Velocity Impact by a Free Fall Penetrometer
Free-fall penetrometers (FFPs) are an attractive tool for the rapid characterization of sediments in the nearshore and coastal areas. To improve their measurement capabilities, modern FFPs can be equipped with pore pressure sensors. Pore pressure measurements are extensively used in traditional …
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Subsurface Planetary Investigation Techniques and Their Role for Assessing Subsurface Planetary Composition
… using imagers, radars or physically using penetrometers or drills, a pre-existed knowledge of the mechanical and electrical properties of the subsurface regolith should be acquired for better data interpretation and analysis. Therefore, the main objective of this work is to investigate the …
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Scaling effect in cone penetration testing in sand
… application of the CPT, new varieties of cone penetrometers have appeared, with different sizes than the standard. Smaller cones are used for instances where relatively small depths of soil need to be penetrated, and larger cones have been developed for penetrating dense and gravelly soils. …
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The miniature electrical cone penetrometer and data acquisition system
… in liquefaction assessment. Typical cone penetrometers are heavy duty devices which are operated with the assistance of a drill rig. However, this capacity is not necessary in the case of field studies of liquefaction, since liquefaction usually occurs at relatively shallow depths. This …
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Investigation of the Relationships Between Geotechnical Sediment Properties and Sediment Dynamics Using Geotechnical and Geophysical Field Measurements
… and hazard mitigation. Portable free fall penetrometers have emerged as an economic and useful tool for rapid geotechnical site characterization and uppermost sediment layer investigation. Acoustic methods have been used to assess seabed layering, scour evolution, and seabed morphology. …
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Numerical and Data Analysis of a Portable Free Fall Penetremeter
… behavior of coastal soils. Portable free-fall penetrometers (PFFPs) are widely used for this purpose, offering a rapid and efficient means of collecting in situ soil data. Despite their utility, the interpretation of PFFP data remains uncertain due to the empirical nature of existing methods …
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Probabilistic Characterization of Sediments Using a Combined Geotechnical and Geophysical Approach
… utilizing data from Portable Free Fall Penetrometers (PFFP) and Chirp sub-bottom profilers for enhanced shallow-water sediment assessment. First, a probabilistic machine learning model, combining Random Forest and a Bayesian 1D Convolutional Neural Network, is developed to classify …
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Development of a Sediment Sampling Free Fall Penetrometer Add-on Unit for Geotechnical Characterization of Seabed Surface Layers
… processes. For example, portable free fall penetrometers (PFFPs) can assist with the detection of mobile sediment layers. They are easy to deploy, and can provide a large spatial coverage in a time- and cost-effective manner. However, they often struggle to provide more detailed information …
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Rate Effect Behaviour of Different Clays from High Speed Triaxial Element Testing
… Rapid Load Testing (RLT) of piles, Free-Falling Penetrometers (FFP) and Deep Penetrating Anchors (DPA), as well as in the numerical modelling of high strain-rate activities in general. The triaxial testing used a number of techniques to improve the accuracy of the results including lubricated end …