Analytical and numerical investigation on the stability of historical supporting structures

Graduation Year:2002
editor:Prof. Dr.-Ing. F. Heinrich, Dipl.-Ing. A. Hausdorf
contracting authority:IBS - Ingenieurbüro Thomas Schmidt Freiberg

Subproject 1: Stability studies on historic retaining walls along the Sachsenmagistrale between Freiberg and Dresden

Problem:Proof of the stability of historical retaining walls under higher external loads and with increasing service life
solution:Characteristic value determination on the basis of core drillings; Modeling in consideration of retaining areas with different levels of tempering, analytical proof of stability (tilting, terrain breaking, sliding, ground breaking, compressive and shear strength); numerical calculations using the FEM
Result:Element-related proof of safety against exceeding the uniaxial compressive strength and safety against shear failure; Comparison and interpretation of the analytical and numerical calculation results; Proof of injection success

Subproject 2: Parameter studies on the stability of the outer wall of Altenburg Castle

Problem:Partial collapse of the wall over a length of approx. 8 m on 22.03.2000
solution:Analysis of the causes of failure (progressive weathering processes, especially in the area of joints, inadequate remedial measures, insufficient drainage of the backfilling and moistening of the entire wall, uncontrolled growth of vegetation, defective covering of the wall crown); Determination of the material characteristics of the multi-layered masonry as well as the upcoming loose and hard rocks from subsoil, foundation and masonry reports, calculations and assumptions; numerical calculation of the shear parameters of the wall in the failure state by back analysis (back calculation) with the help of the FEM assuming elasto-plastic material behavior
Result:Exceeding the shear strength of the air-side outer shell as the most likely failure mechanism; numerical simulation of securing and refurbishment measures (injection, needling, homogenization) and proof of their stability enhancing effect