Soil mixing techniques serve to create unreinforced structural elements (single elements or bodies of soil made of single elements) through grouting of the soil with a binder suspension on site. With the help of suitable tools, a defined volume of soil is mixed with a predetermined volume of binder suspension in a wet mixing process to form a homogeneous, self-hardening mixture.

Regulatory framework

There are no conclusive technical rules for the design and execution of the structural elements by means of soil mixing techniques. DIBt grants general construction technique permits (aBG) for corresponding applications. The executing company must submit a declaration of conformity stating that the executed elements comply with the provisions of the relevant construction technique permit.

The temporary use of such structural elements (generally < 2 years) does not require a regulatory verification of fitness for use or application. The structural elements can be designed on the basis of DIN 4093 'Design of strengthened soil – Set up by means of jet grouting, deep mixing or grouting'.

The use of these techniques for ground improvement is permitted from a regulatory point of view and does not require a construction technique permit.