Back analysis for tunnel engineering as a modern observational method

Sakurai, Shunsuke; Akutagawa, Shinichi; Takeuchi, Kunifumi; Shinji, Masato; Shimizu, Norikazu

doi:10.1016/s0886-7798(03)00026-9

Cited by 75 publications

(32 citation statements)

References 7 publications

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“…In order to obtain the optimized values of related model parameters which can give a good match between predicted and measured values, back analysis is applied to conduct the parameter optimization [34,35]. Fig.…”

Section: Back Analysismentioning

confidence: 99%

Model validation and calibration via back analysis for mechanized tunnel simulations – The Western Scheldt tunnel case

Zhao

Lavasan

Thomas

et al. 2015

Computers and Geotechnics

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Section: Back Analysismentioning

confidence: 99%

Model validation and calibration via back analysis for mechanized tunnel simulations – The Western Scheldt tunnel case

Zhao

Lavasan

Thomas

et al. 2015

Computers and Geotechnics

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“…Current back-analysis methods include inverse method (Sakurai and Takeuchi 1983;Qiu et al 2003), atlas method (Wang et al 1998), direct inverse analysis (Gioda and Maier 1980;Jia et al 2003;Likar and Vukadin 2003;Fakhimi et al 2004;Oreste 2005;Karakus and Fowell 2005;Zhang et al 2006), back-analysis method of model parameters in geotechnical engineering by an artificial neural network (Pichler et al 2003), intelligent method (Shang et al 2002;Hao et al 2005), and a series of backanalysis procedures in which the identification of strain distribution is sought as the primary goal in order to achieve a solid and reliable routine of observations and data interpretations (Sakurai et al 2003). Based on total or incremental displacement data, the back-analysis method has been successfully applied by many researchers in the construction of tunnels (e.g., Hao et al 2005;Jia et al 2003;Sakurai et al 2003;Qiu et al 2003;Sakurai and Takeuchi 1983).…”

Section: Introductionmentioning

confidence: 99%

“…Based on total or incremental displacement data, the back-analysis method has been successfully applied by many researchers in the construction of tunnels (e.g., Hao et al 2005;Jia et al 2003;Sakurai et al 2003;Qiu et al 2003;Sakurai and Takeuchi 1983). In addition, the synthetical prediction with back analysis and normal computation was proposed by Yang et al (1995).…”

Section: Introductionmentioning

confidence: 99%

Influence of continuous rainfall on surrounding rock-initial support system of shallow decomposed-rock tunnel

2010

Environ Earth Sci

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A case study is presented to identify the influence of continuous rainfall on surrounding rock-initial support system of shallow decomposed-rock tunnel. From March 21 to April 29, 2006, rainfall with intensities ranging from \10 mm/day to [25 mm/day fell several hours every day, resulting in the collapse of the tunnel crown after the initial support of the surrounding rock in a part of shallow tunneling bench sections of Xiang-an Subsea Tunnel, located in Xiamen, Fujian, China. The applied calculation method of 3D elastic-plastic numerical back analysis based upon FLAC 3D is presented. Through site investigation, test and in situ monitoring, the surrounding rock physical-mechanics parameters and support parameters were obtained by the calculation of elasticplastic back-analysis method presented here. Furthermore, the influence of continuous rainfall on the stability of shallow decomposed-rock tunnel was investigated using the proposed method. The results show that: (1) rainwater infiltration makes the surrounding rock of the shallow decomposed-rock tunnel continuously softened due to the continuous rain, resulting in decreasing surrounding rock stiffness and coefficient of confinement pressure; (2) the negative influence of groundwater must be considered on the initial setting and initial strength of shotcreting of shallow decomposed-rock tunnel under the action of continuous rainfall, to ensure the stabilization of surrounding rock-initial support system; and (3) tunnel stability analysis by the back-analysis method proposed in this study is reasonable and reliable, which could be used as a reference for the estimation of stability of the same type of tunnels and their design.Keywords Decomposed-rock tunnel Á 3D elastic-plastic numerical back-analysis method Á Continuous rainfall Á In situ measure Á Surrounding rock-initial support system

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“…Over the last 25 years, back-analysis (or identification or inversion or characterization) methods have been gradually established in geotechnical engineering for determining the average mechanical or hydraulic parameters of rock masses based on in-situ measurements conducted during excavation or construction works, on surface or underground [2][3][4][5][6]. Back-analysis method has been applied to identify insitu stress field [7,8], rock mass deformation modulus and strength parameters [9], rock mass hydraulic properties, rock mass zoning, boundary conditions [10], loads acting on the tunnel linings, etc., through direct application of closed-form solutions or numerical methods.…”

Section: Introductionmentioning

confidence: 99%

“…Contrary to forward analysis, which has unique solution and determines the output such as displacement and stress from inputs such as geological structure, mechanical parameters and in-situ stress, backanalysis cannot guarantee the uniqueness of the solution [6]. Although a unique solution cannot be provided, the results obtained from back-analysis still have engineering value in design confirmation and model verification.…”

Section: Introductionmentioning

confidence: 99%