DBPapers
DOI: 10.5593/sgem2012/s02.v2007

DETERMINATION OF OPTIMAL SUPPORTING SYSTEM OF DEEP FOUNDATION PIT BASED ON MULTI-CRITERIA DECISION ANALYSIS

Z. STRUKOVA, M. KOZLOVSKA, B. KOVACOVA
Wednesday 1 August 2012 by Libadmin2012

References: 12th International Multidisciplinary Scientific GeoConference, www.sgem.org, SGEM2012 Conference Proceedings/ ISSN 1314-2704, June 17-23, 2012, Vol. 2, 47 - 54 pp

ABSTRACT

Construction of buildings with underground floors is connected with construction works
performed in open large and deep foundation pits. Necessity of supporting systems
(SSs) ensuring stabilization of the pit, notably from workers safety and stableness of
surrounding buildings point of view, is obvious. In this paper is presented the method of
determination of optimal supporting system (SS) of deep foundation pit based on multicriteria
decision analysis. The method is applied on the case of construction of shopping
centre in Kosice, the building with two underground floors. Two optimizing analysis are
solved. The first multi-criteria optimizing task is intent on estimation of total utility of
seven variants of SSs (Berliner bracing, Larsen sheet pile walls, underground diaphragm
walls, …). Ten decision criteria and their significance are estimated and their rates are
quantified. The decision criteria are stated through the decision three. The second
optimizing problem is aimed to estimate the total utility of two variants of SSs with two
highest total utilities among seven variants rated by the first optimizing task. Only two
decision criteria are considered in the second optimizing task; construction time and
cost, which influence the selection of optimal SS of the deep foundation pit from
technologically-economical point of view. The engineering designs, time schedules and
price calculations of two compared variants are developed in order to solve the second
optimizing task.

Keywords: deep foundation pit, foundation pit protection, multi-criteria decision
analysis, special foundation works, supporting system