Answers to a number of FAQs can be found in the FAQ ppt presentation

Other answers can be found below.

 

FAQ HARDWARE

 

GAS TANK AND GAS CONSUMPTION FOR DILATOMETER TESTING

A 10 litre tank, filled at 200 bar, taking the normal regular readings A and B (and possibly C), permits to execute, in a “medium soil”, say 2 or 3 DMT soundings 20 m long.

Such length will be more if the soil is soft, less if the soil is stiff, because at each depth the system is deflated, and the higher the pressure, the more gas will be consumed.

In general in most “normal” investigation a couple of these tanks will be more than sufficient.

The pressure regulator should be able to provide a regulated output up to 70-80 bar.

In general, for an investigation of a few DMT soundings, a couple of 10 litre tanks are sufficient, and practically always a reserve of gas remains unused.

 

 

FAQ INTERPRETATION

 

COHESION AND PHI DETERMINATION.

In saturated clay no method is available as today for determining c’ & Phi’.

In cemented silts or sands, or in residual soils, methods have been developed by Cruz et al. 2004 and Cruz et al. 2010.

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