American Journal of Civil Engineering and Architecture, 2014, Vol. 2, No. 4, 136-142 Available online at http://pubs.sciepub.com/ajcea/2/4/3 © Science and Education Publishing DOI:10.12691/ajcea-2-4-3 The Impact of Deep Foundations of Building Structures on the Neighbouring Buildings – a Static Analysis Czesław Miedziałowski, Damian Siwik * Institute of Civil Engineering, Bialystok Technical University, Białystok, Poland *Corresponding author: d.siwik@o2.pl Received July 18, 2014; Revised August 05, 2014; Accepted August 12, 2014 Abstract Deep foundations of buildings and their impact on neighbouring buildings is one of the most important issues when planning a new facility. Whereas, the analyses of the threats often come down only to a simplified evaluation of the building subsidence and to comparing them with the limit values. The paper presents the methodologies for using the subsidence surface of the land behind the housing wall of the excavation to assess the impact of additional displacements on the technical condition of facilities, through the determination of the distribution and the values of stresses in the estimated structure. Keywords: deep foundation, adjacent buildings, Finite Element Method, FEM Cite This Article: Czesław Miedziałowski, and Damian Siwik, “The Impact of Deep Foundations of Building Structures on the Neighbouring Buildings – a Static Analysis.” American Journal of Civil Engineering and Architecture, vol. 2, no. 4 (2014): 136-142. doi: 10.12691/ajcea-2-4-3. 1. Introduction The analysis of the impact of deep foundation of the building (e.g. foundation in a deep excavation) on neighbouring facilities requires the engineer/designer to examine two basic static patterns: - the phase of the excavation (Figure 1a) - due to the relaxation of the excavation floor the displacement of soil occurs, and thus of the objects in the vicinity, - the phase of the operation of the building (Figure 1b) – the preloading of the soil with the building results in subsidence of the newly formed structure and of the facility in its vicinity. Figure 1. The implementation phases of the calculations in the analysis of the impact of a deep foundation of the building on the adjacent buildings: a) phase of the excavation; b) phase of the operation of the building Whereas, the deformation of the land, in the operation phase of the building can occur both in the form of subsidence and uplifts due to an earlier relaxation of the excavation. The shape of the subsidence of displacements behind the housing wall depends, among others, on the depth of the excavation, the type of the casing used and its static diagram [12]. The basic tool for the analysis of this type of issues is currently the Finite Element Method (FEM) [24]. Whereas, if the use of the numerical method, in the case of simple two-dimensional systems does not cause many problems. Then, in the case of three-dimensional issues, especially in the case of interactive systems: a building-soil- neighbouring buildings (Figure 2), there may appear difficulties with equipment, which does not allow for the analysis of such large computational tasks. Due to the threat posed by a new implementation of the facility with deep foundation on the existing buildings, the issues of this type should be thoroughly analysed as early as at the design stage of construction ([6,9,17]).