Structural Reliability Analysis of NATM Tunnel Face Stability in Soft Ground

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Title: Structural Reliability Analysis of NATM Tunnel Face Stability in Soft Ground
Authors: Moradabadi, Ehsan
Golshani, Aliakbar
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Date: 20-Mar-2013
Online since: 2016-02-09T10:44:21Z
Abstract: In spite of enhancement in modeling techniques as well as site investigation methods, uncertainty exists seriously in the process of construction of underground structure in soft soils. These uncertainties arise from limited data of geological data, measurement errors, interpolation of spatially geological properties, and extrapolation of results of experiments and natural analogue studies over times and conditions relevant to the project. Robust and optimize design of tunnel support pattern consists many important parameters including advance rate and excavation method. However, quantitative definition of these parameters is difficult because of restricting in site investigation data and uncertainties related to them. Furthermore, erroneous evaluation in these parameters can affect in incorrect projection of tunnel stability or economic loss. In this study, a probabilistic hypothetical elasticity modulus approach, based on Monte Carlo simulation algorithm (Latin Hyper Cube sampling), has been employed to evaluate the uncertainty in lining design of a NATM tunnel located in Tehran region. A parametric finite element model based on ABAQUS and a MATLAB interface program has been introduced to evaluate the performance of supporting system to limit the settlements induced by tunnel excavation in the different magnitudes of lifetime probability of failure. The tunnel has a horseshoe shape, excavating in a soft soil for subway purpose.
Type of material: Conference Publication
Publisher: CIR Publishing
Keywords: Reliability/uncertainty analysisMonte Carlo simulationSettlement controlHypothetical elasticity modulusParametric finite element model
DOI: 10.13140/RG.2.1.2007.7920
Language: en
Status of Item: Peer reviewed
Is part of: Sang-Hwan Kim, Chungsik Yoo, Inn-joon Park (eds.). Proceedings of International Symposium on Tunnelling and Underground Space Construction for Sustainable Development 2013
Conference Details: TU-Seoul 2013: Tunnelling and Underground Space Construction for Sustainable Development, Seoul, Korea, March, 2013
ISBN: 9788997776597
Appears in Collections:Civil Engineering Research Collection

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