flat dilatometer

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Geotechnical investigation — Geotechnical investigations are performed by geotechnical engineers or engineering geologists to obtain information on the physical properties of soil and rock around a site to design earthworks and foundations for proposed structures and for… … Wikipedia
Strainmeter — A strainmeter is an instrument used by geophysicists to measure the deformation of the Earth.Linear strainmeters measure the changes in the distance between two points,using either a solid piece of material (over a short distance)or a laser… … Wikipedia

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