Technical feasibility

SECTION I: Testing

1 Has the R & D result been tested?
YES X
NO

The following question is replied according to the reply in question 1

If yes

1a In what mode has the result been tested?

•              Prototype

•              Pilot Application

•              Alpha/BETA testing

The prototype geophysical measurement array and the structural configuration have been thoroughly studied in several European research projects since 1993, and the outcome has been published in peer reviewed scientific reports, journals and conference proceedings.
1b. Please describe and discuss the testing results
The field measurements conducted in EUROSEIS since its first operation permitted the construction of the complete 3D structure of the whole basin. Geophysical and geotechnical measurements provided the definition of the geometry and the dynamic properties of the main geological formations of the basin.

In total, more than 1100m of boreholes have been drilled in the Mygdonian basin where EUROSEIS resides, used for geotechnical sampling and in-situ experiments. Furthermore, 20.5km of seismic investigations provided with the dynamic soil properties of the deeper geological formations. Electrical surveys provided through resistivity mapping the bedrock depth and the geometry boundaries of the basin. Microtremor array measurements provided the thickness of the geological formations. Finally, an extensive campaign of geotechnical laboratory and in-situ experiments provided the full description of physical, mechanical and dynamic properties of the soil materials found in the EUROSEIS test site area.

The permanent EUROSEIS accelerometric array operates since 1993. The present configuration of the EUROSEIS array consists of 21 high resolution triaxial surface and down-hole accelerographs installed in a cross-shape at the central part of the basin. Fifteen stations are installed at the surface and the rest in boreholes at different depths. Seventeen instruments are placed on alluvial deposits and four on rock outcrops or bedrock (outcropping rock stations and bedrock stations). Two types (modes) of remote control and telecommunication have been installed, after proper testing, covering the EUROSEIS array: (i) Wire communication using the National Greek Telecommunication Organization (OTE) and (ii) mobile wireless communication using data/voice NOKIA 30 modems. In the first case a card PCMCIA modem is incorporated in the accelerograph with an appropriate firmware directly connected to the OTE data/voice line. Communication speed is up to 9600 baud rate (bits/sec), facilitating data transfer in a cost-effective manner. The recordings signals are transferred via wire and radio transmission to Thessaloniki and archived in a central system, creating a high quality data set of earthquakes accessible via the EUROSEIS web-site (http://euroseis.civil.auth.gr). This high-quality database contains more than 300 seismic events.

Recently a simplified structure has been constructed in order to perform dynamic response analyses and investigate the soil-foundation-Structure interaction phenomenon. The simplified structure comprises of a foundation plate made of reinforced concrete, and four steel columns supporting the reinforced concrete roof. The whole foundation-structure system has configurable mass and stiffness, in order to adjust its dynamic properties according to the need. A temporary array of accelerometers and seismometers has been deployed on and around the simplified structure, in order to record the soil and structural response due to forced vibration tests.

The observed recordings for the sedimentary valley where EUROSEIS site is situated have been published in more than 200 papers in international and national scientific journals and conference proceedings, along with the corresponding numerical analyses. Geotechnical surveys have been equally deployed to investigate the geotechnical profile of the valley, using laboratory and in-situ experiments. The results have also been published in international scientific journals and conference proceedings.

SECTION 2: Current Stage of Development

2a To what extent does the development team have technical resources for supporting the production of a new product? (Researchers, human resources, hardware, etc. )
The research product of EUROSEIS is a collective result of the collaboration of the members of the Research Unit of Soil Dynamics and Geotechnical Earthquake Engineering (SDGEE), from the Laboratory of Soil Mechanics, Foundation and Geotechnical Earthquake Engineering , along with researchers from the Institute of Engineering Seismology and Earthquake Engineering (ITSAK) of Greece.The land property of EUROSEIS is shared between SDGEE and ITSAK, with a 70% and 30% percent respectively, while SDGEE holds the scientific responcibility of the test site. Geophysisists, geotechnical engineers with long time experience in laboratory and in-situ experiments, geologists, experts in structural dynamics, numerical analyses and computer simulations are able to consult the end user on all the technical, organization and research issues.
2b What are the technical issues that need to be tackled for full deployment, if needed?
EUROSEIS test site is a physical laboratory fully equipped and ready to be used. However, the development of a scheme for the position of the temporary accelerometric and seismometric array configuration would demand the configuration by the end user, according to the needs.
2c What additional technical resources are needed for the production of this new product?
No other technical resources are needed for the product to enter the market. Yet, given that the product is addressed to scientific organizations and research institutes, there is a need for constant development and improvement of the data management and analyses methods. This can be secured with the continuous work of a group of scientists:

  • One expert in geophysics
  • One expert in measurements and data recordings
  • One expert in geotechnical engineering
  • One expert in numerical analysis
2d Overall assessment of the current stage of technical development.
The EUROSEIS site is ready to use for research on the field of geophysical and geotechnical engineering, site effect, topographic effects, strong ground motion, soil dynamics, dynamics of structures, as well as on the combined effects of the above mentioned parameters on the strong motion and dynamic response.

SECTION 3: Deployment

3a Define the demands for large scale production in terms of
  • Materials
Not applicable
  • technologies, tools, machineries
Not applicable
  • Staff effort
Offering/Renting EUROSEIS test site presupposes the employment of a supporting team which comprises of:

  • One expert in in-situ measurements
  • One person for the recorded data acquisition

SECTION 4: Overall Assessment

1 What is your overall assessment of the technical feasibility of the research result?
The EUROSEIS site is ready to use for research on the field of geophysical and geotechnical engineering, site effect, topographic effects, strong ground motion, soil dynamics, dynamics of structures. Since the beginning of its operation, a continuous campaign of surveys have resolved all technical issues related to the use of the testing facilities.

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