Journal
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
Volume 51, Issue -, Pages 1-10Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tust.2015.10.014
Keywords
Pipe-jacking; Friction; Direct shear; Rocks; Finite element modeling
Funding
- Hock Seng Lee Bhd
- Jurutera Jasa (Sarawak) Sdn. Bhd
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Prediction of jacking forces has been well-established for pipe-jacking drives traversing soils. However, the accrual of jacking forces for drives negotiating weathered rock formations has not been well understood. Three pipe-jacking drives in Kuching City, Malaysia spanning weathered lithological units of sandstone, phyllite and shale were studied. In the absence of in-situ pressuremeter testing during the investigation stage, tunneling rock spoils were collected and characterized through direct shear testing. The generalized tangential technique was applied to the nonlinear direct shear test results to obtain linear Mohr-Coulomb parameters, c(p)' and phi(p)'. This allowed for back-analysis of frictional coefficient, mu(avg), through the use of a well-established predictive jacking force model. The reliability of using c(p)', phi(p)', and mu(avg) was assessed through 3D finite element modeling of the studied pipe-jacking drives. Based on these parameters, the results obtained from the numerical analyses of the studied pipe-jacking drives show good agreement with the jacking forces measured in-situ. The outcome of this research demonstrates that the derived strength parameters from direct shear testing of tunneling rock spoils has the potential to be used as reliable input parameters in finite element modeling to predict pipe-jacking forces in highly weathered geological formations. (C) 2015 Elsevier Ltd. All rights reserved.
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