Optimization Of Underground Excavation In
Rock Masses Using ESO Techniques
Author(s)
G. Ren & Y. M. Xie
Abstract
Excavation in rock masses induces complex stress redistribution around the
opening. Inter alia, the stability of the opening is principally dependent on the
stresses around the opening. The most influential factor attributing to the stress
distribution is the geometrical shape of the opening. As such, finding the optimal
shape for an underground excavation has practical significance in increasing
stability and lowering support costs. This paper describes an approach to the
shape optimization of underground excavation using Evolutionary Structural
Optimization (ESO) techniques. Through illustrated examples, it is demonstrated
that ESO method can be used to explore the excavation shapes that give
optimized performance in terms of stress distribution and stability. The method
is validated and compared with theoretical solutions. An example of a three
dimensional case is presented in comparison with a well-known application case.
Keywords: excavation, cavern, finite element, optimization, evolutionary
structural optimization, numerical analysis.
1 Introduction
Stability is one of the primary considerations in an underground excavation
design in rock masses. The stability of a rock structure is usually dependant on a
number of factors, including the rock mass strength, supporting system and the
shape of the excavation. In underground rock structure construction, the rock is
used as a structural material which is subjected to massive stress regime change
due to exaction. The shape of the excavation influences the stress distribution
around the excavation, which in turn affects the stability of the excavation. In
addition to satisfying the intended functional requirements of the excavation, it is
important to select a propitiate excavation shape that gives the maximum
Keywords
excavation, cavern, finite element, optimization, evolutionary
structural optimization, numerical analysis.
Related Book
Other papers in this volume
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