Bodendruck

Bodendruck, literally ground pressure, is the force per unit area transmitted between soil and a contacting surface. In civil engineering it typically refers to the vertical bearing pressure on foundations and roadbeds, as well as the lateral earth pressure acting on retaining structures. The term covers both the pressure exerted by the ground on a structure and the pressure imposed by the structure on the ground.

Calculation and design commonly use the relation p = F/A, where F is the vertical load and A is the contact area. The resulting average pressure is compared with the soil’s bearing capacity, and an allowable bearing pressure is derived by applying a safety factor. Designers also assess settlements, since excessive Bodendruck can lead to soil compression, differential settlement, and, in extreme cases, structural instability. In geotechnical practice, vertical bearing pressure is complemented by considerations of lateral earth pressure for walls and abutments, which can be estimated using theories such as Rankine or Coulomb.

Factors influencing Bodendruck include soil type (cohesive vs. cohesionless), density, moisture content, groundwater level, and load duration or repetition. Environmental conditions and construction sequence can alter bearing behavior, making site investigations and monitoring important.

Applications span foundation design for buildings and towers, road and bridge subgrades, and embankments. Field tests such as plate bearing tests and other geotechnical investigations help determine bearing capacity and allowable pressures. Governing standards include geotechnical design guidelines and codes such as Eurocode 7 and related national standards, which provide methods for assessing soil strength, settlement, and safety under planned loads.