Recommendations on Excavations (3^rd Ed.)

With the issue of these recommendations, which have the character of a standard, the "Building Excavations" working group of the German Geotechnics Association (DGGT) aims to provide assistance with the design and structural calculation of excavation support works.
The introduction of the Eurocodes for building control purposes made necessary a revision of the previous edition of the recommendations to comply with the requirements of DIN EN 1997-1:2009 together with the national annex DIN 1997-1/NA:2010-12 and the supplementary regulations of DIN 1054:2010-12. All recommendations were thoroughly checked, revised where necessary and adapted to new knowledge. Chapter 10 "Building excavations in water" was substantially revised. Due to the progress of development of measurement instruments and the more stringent requirements, Chapter 14 "Instrumentation for the monitoring and supervision of building excavation support works" was formulated completely anew.
The recommendations of the working group "Building Excavations" should be of assistance,
- to simplify the design and structural calculation of excavation support works,
- to harmonise loading assumptions and calculation procedures,
- to ensure the structural stability of excavation support works and their individual elements and
- to improve the cost-effectiveness of excavation support works.

Introduction
Analysis principles
Magnitude and distribution of earth pressure
General stipulations for analysis
Analysis approaches for soldier pile walls
Analysis approaches for sheet pile walls and in-situ concrete walls
Anchored retaining walls
Excavations with special ground plans
Excavations adjacent to structures
Excavations in water
Excavations in unstable rock mass
Excavations in soft soils
Analysis of the bearing capacity of structural elements
Measurements and monitoring on excavation structures
Appendices

The working group 2.4 "Building Excavations" in the technical group "Earthworks and Foundation Engineering" of the German Geotechnics Association, Essen (DGGT), under the leadership of the chairman Prof. Dr.-Ing. A. Hettler, work on a voluntary basis.