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Topic: Geotechnical design and analysis
Subject: Dynamic and Static modulus
 
Author: massimo trossero 2005-04-01  
     
  I've read the rare and interesting tractation of how to try to convert Dinamic modulus G to Static modulus E at large strain or service strain for foundations, available at: http://www.geoforum.com/knowledge/texts/compaction/viewpage.asp?ID=13

I guess it is possible using the same formulas (or others more appropriate) to convert the diynamic modulus,

found with light drop weight tester according to german standards : ZTVE-StB ZTVT-StB 95
shown at: http://www.zorn-online.de/en/products/zfg02/index.html

to the static modulus E an then obviosly to Emv and Ks for which the formulas are well known.

Thanks 		 
   

 
Follow-up:
  Author: K. 2005-04-02  
     
  Dear friend,

Please note that the rate of loading during a dynamic impact test is different to that of a small-strain seismic test. As pointed out in the publication you refer to (Keynote Lecture at ISC´2 Conference in Porto), the rate of loading during a seismic test is of the same order of magnitude as that during a conventional static test.

However, in the case of a falling-weight test, the rate of loading changes during the duration of impact – thus it is not constant as in the case of a seismic test.

We have worked on solutions for the impact test and intend to publish the data at an appropriate occasions.

Sincerely,
Rainer Massarsch
 		 
     

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