Drivable device for compacting a soil layer structure and method for ascertaining a layer modulus of elasticity of an uppermost layer of this soil layer structure

A method for ascertaining a layer modulus of elasticity of a layer of a soil layer structure during a soil compaction procedure, comprising:

• introducing at least one load pulse (P) into a load introduction area via a surface of an uppermost layer of the soil layer structure;
• detecting a first value (w1) of a depression trough of the soil layer structure in the load introduction area via a first detection device,
• ascertaining an equivalent modulus of the soil layer structure from the detected first value (w1) of the depression trough;
• detecting a second value (w2) of the depression trough outside the load introduction area via a second detection device,
• ascertaining a bedding modulus of the soil layer structure from the detected second value (w2) of the depression trough;
• ascertaining the layer modulus of elasticity of the uppermost layer of the soil layer structure from the two detected values (w1, w2) of the depression trough and the ascertained equivalent modulus or the bedding modulus,
• wherein the load pulse (P) is introduced via a vibration device of a soil compaction machine into the soil layer structure.