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Computer-controlled, servo-assisted, variable energy dynamic super-heavy penetrometer

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19May. 2020

The International Society for Soil Mechanics and Geotechnical Engineering (ISSMGE) has just published online an article dedicated to the Grizzly-EV®. This paper was presented by Sol Solution at the XVI Pan-American Conference on Soil Mechanics and Geotechnical Engineering (XVI PCSMGE).

The International Society for Soil Mechanics and Geotechnical Engineering (ISSMGE) has just published online an article dedicated to the Grizzly-EV®. This paper was presented by Sol Solution at the XVI Pan-American Conference on Soil Mechanics and Geotechnical Engineering (XVI PCSMGE).

In this paper, the 1st heavy dynamic variable energy penetrometer in the world, the Grizzly-EV® is presented. A description of the associated technologies and the operating modes programmed into the machine is given. The processing and exploitation of the measurements as well as a series of campaigns including comparative tests with the CPT are also presented.

These results validate the work carried out by Sol Solution researchers and highlight the fact that the control of the beating energy of heavy penetrometers benefits from the quality, quantity and reliability of the measurements.

The link to the publication is the following:

https://www.issmge.org/uploads/publications/84/85/01-08-miguel-angel-benz-navarrete.pdf

Variable energy control to heavy dynamic penetrometers

Since the early 1990s, SOL SOLUTION has been designing, developing and marketing innovative products for geotechnical recognition.

Work on the Panda® (the company's flagship product) and the technology incorporated in this device has taken up a challenge that has long remained unanswered: "To develop a computer-controlled heavy dynamic penetrometer DPSH (EN ISO 22476-2) integrating real-time control of the driving energy according to the hardness of the soil encountered during the survey". The Grizzly EV® (Variable Energy Super Heavy Dynamic Penetrometer) was thus born.

The DPSH heavy dynamic penetrometers are undoubtedly the best suited to work on very compact soil layers with high resistance. On the other hand, in soft soils, this type of equipment has the defect of its qualities: a pile driver can drive the tip of 200 millimetres in one go, or even more. The measurement thus loses a great deal in quality and fineness as well as precision.

However, these pathogenic or particular soft zones are of particular interest to geotechnicians.

It is to meet this need that Sol Solution has developed a complete real-time automation of this adaptation of ramming energy according to the compactness of the soils encountered during the sounding.

A series of sensors and electromechanical systems are installed on the machine in order to have several energies available: DPL, DPM, DPH and DPSH (Standard EN ISO 22476-2) by varying the drop height, while maintaining the same threshing mass.

All this is controlled by the PC embedded on the Grizzly®. Depending on the previous ramming operation, the computer instantly decides the H value for the next ramming operation, adapting in real time to the resistance encountered: the more resistance variations there are in the ground, the more frequent the changes in energy, and therefore in height, are; and all this without any operator intervention on the machine or interruption of the ramming operation. During a sounding, the peak resistance is automatically calculated according to the threshing energy supplied.

The results obtained are recorded and plotted immediately according to depth on the PC screen, and sent a posteriori to Sol Solution's software platforms where data storage and security, positioning, processing and exploitation of the information will be carried out.

This new technique makes it possible to obtain a profile with very fine depth resolution and to limit the threshing energy in the case of soft and/or saturated soils, thus increasing the reliability of the measurements.

To be read

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