Installation of a Large Diameter Reinforced Concrete Pipe by Jacking Methods

Greene, Brian H.; Harkness, A.L.

doi:10.2113/gseegeosci.i.4.518

Cited by 3 publications

(1 citation statement)

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“…For example, uncertainty in jacking force prediction is typically alleviated using expensive inter-jacks at pre-defined intervals along the pipe string which are often not used during the drive (Atalah et al 1994, Sheil 2020). A more flexible approach has been shown to realise major time and cost savings (Shah et al 1993, Greene and Harkness 1995, Sterling 2020. This study presents a Bayesian approach to update uncertain model parameters for the prediction of microtunnelling jacking forces using the latest monitoring data acquired during the drive.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Pipe-Jacking Forces Using a Bayesian Updating Approach

Sheil

Suryasentana

Templeman

et al. 2022

J. Geotech. Geoenviron. Eng.

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An accurate estimation of the jacking forces likely to be experienced during microtunnelling is a key design concern for the design of pipe segments, the location of intermediate jacking stations and the efficacy of the pipe jacking project itself. This paper presents a Bayesian updating approach for the prediction of jacking forces during microtunnelling. The proposed framework is applied to two pipe jacking case histories completed in the UK including a 275 m drive in silt and silty sand and a 1237 m drive in mudstone. To benchmark the Bayesian predictions, a 'classical' optimisation technique, namely genetic algorithms, is also implemented. The results show that predictions of pipe jacking forces using the prior best estimate of model input parameters provide a significant over-prediction of the monitored jacking forces for both drives. This highlights the difficulty in capturing the complex geotechnical conditions during tunnelling within prescriptive design approaches and the importance of robust back-analysis techniques. Bayesian updating is also shown to be a very effective option where significant improvements in the mean predictions, and associated variance, of the total jacking force are obtained as more data is acquired from the drive.

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Section: Introductionmentioning

confidence: 99%

Prediction of Pipe-Jacking Forces Using a Bayesian Updating Approach

Sheil

Suryasentana

Templeman

et al. 2022

J. Geotech. Geoenviron. Eng.

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Numerical analysis of soil deformation behind the reaction wall of an open caisson induced by horizontal parallel pipe-jacking construction

Sun

Xia

et al. 2015

Can. Geotech. J.

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The disturbance of the soil behind the reaction wall of an open caisson can affect the efficiency and safety of jacking operation and control. This study focuses on the deformation of the soil mass behind the reaction wall used to support the jack. The stress–strain relationship of the soil behind the reaction wall was analysed, providing a theoretical basis for determining the most unfavourable combination of reactive forces using a computational model. A three-dimensional finite element model for this problem was developed, and a simple loading scenario was implemented. In addition, the mechanism of the deformation of the soil induced by horizontal parallel pipe jacking was also analysed. The results showed that for the soil behind the reaction wall of the open caisson, the uplift deformation of the soil surface increased initially and later gradually decreased, eventually achieving stability. The reaction force had a relatively obvious effect on the deformation of the soil within the range of the reaction wall burial depth and the horizontal displacement of the soil along the length of the reaction wall. The maximum displacement occurred near the axis of symmetry of the reaction wall. In addition, to consider the cyclic characteristics of the reaction force, the shakedown theorem is introduced to the deformation analysis of the soil and compared with the results obtained from simple loading. It was shown that the two deformation analysis methods have certain scopes of application, depending on the individual engineering requirements.

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Technical and Contractual Trends for Micro Tunneling Projects in Romania and Bulgaria

Tsitsas

Kolev

Radoi

et al. 2017

AEF

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This publication provides an overview of the current technical and contractual trends that govern the execution of micro-tunneling projects in both Romania and Bulgaria. Technical issues discussed include available equipment and technologies, aspects related to the complexity and challenges of these works, comparisons between the open trench and trenchless methods, environmental impact, and other. Legal issues discussed include contractual schemes, relationship between the parties involved, dispute resolution, and contract types in compliance with both the national as well as the European Union law. Appropriate technical equipment is recommended to avoid risk in implementation and ensure the quality of finished products.

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Installation of a Large Diameter Reinforced Concrete Pipe by Jacking Methods

Cited by 3 publications

References 0 publications

Prediction of Pipe-Jacking Forces Using a Bayesian Updating Approach

Prediction of Pipe-Jacking Forces Using a Bayesian Updating Approach

Numerical analysis of soil deformation behind the reaction wall of an open caisson induced by horizontal parallel pipe-jacking construction

Technical and Contractual Trends for Micro Tunneling Projects in Romania and Bulgaria

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