چكيده به لاتين
The aim of this project is to achieve better understanding of uncertainty related to the excavation safety and to be able to design and implement safer excavation.
In the projects involving soil, due to the great uncertainty in the choice of soil parameters, comparing the reliability to other structural projects are more importante.
In this research the negative impact of uncertainty in soil parameters are shown and finally a solution to reduce the negative impact on the reliability of projects are expressed.
Among soil parameters that affect the uncertainty of the soil project, 𝛷 (friction coefficient), c (soil cohesion) and ɤ(special weight) are discussed.
The effect of other parameters such as nail length, hole diameter, the distance between nails, and nail tension force on the excavation uncertainty are shown and the related diagrams of the impact of the aforementioned parameters are considered.
Using this diagrams, the overview of the effect of the parameters involved in the design are achieved. These results (cost, quality and time) help the contractors and employers in the projects for making better decision.
To obtain reliability, the FORM (first order reliability method) which is an efficient and cost effective method to study uncertainty, is used and the full description of this method is provided in the thesis.
The case study used in this project is derived from the Iran zamin excavation project .The land under study has a triangular geometry with an approximate area of 16000m^2. This project started in September 2012 , but a month later while the excavation was at a depth of approximately 32 meters, due to the strenght loss of part of the northern wall, the excavation wall failed.
Keywords
Excavation, Final Uncertainty, Reliability, FORM method
