Evaluation of Pipe-Jacking Forces Based on Direct Shear Testing of Reconstituted Tunneling Rock Spoils

Choo, Chung Siung; Ong, Danny

doi:10.1061/(asce)gt.1943-5606.0001348

Cited by 63 publications

(39 citation statements)

References 36 publications

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“…The highly fractured Tuang Formation implied that the extraction of intact cores for rock strength characterisation was not feasible. A novel method developed by Choo and Ong (2015) was used to obtain equivalent rock strength parameters from reconstituted tunnelling rock spoils Impact of highly weathered geology on pipe-jacking forces Choo and Ong by using direct shear testing. For the application of the test results to a well-established jacking force model, it was necessary to use the generalised tangential on the test results, resulting in the development of tangential peak parameters c 0 t,p and f 0 t,p .…”

Section: Discussionmentioning

confidence: 99%

“…From direct shear testing of phyllite spoils, the tangential peak MC parameters were c The tightly folded phyllite is characteristically bedded, tightly folded and highly sheared (Tan, 1993). The tight folding could have created a stable bore, which facilitated the development of arching as well as reducing the presence of 'thief zones' through which lubricant could have been lost into the surrounding rock mass (Choo and Ong, 2015). This led to the development of a discrete lubricating layer in the overcut region, ensuring that the lubricant was effectively utilised.…”

Section: Back-analysis Of Measured Jacking Forces: Case Studiesmentioning

confidence: 99%

“…This has a significant effect on accrued pipe-jacking forces, as the frictional jacking forces are a direct consequence of the normal soil stresses acting on the outer surface of the pipeline. Choo and Ong (2015) identified that the highly fractured Tuang Formation behaved as 'soft rock', in that it exhibited soil-like behaviour and demonstrated arching when subjected to tunnelling. Thus, the incorporation of the arching phenomenon into the Pellet-Beaucour and Kastner (2002) jacking force model made it suitable for the assessment of jacking forces in the soft rock of the highly fractured Tuang Formation.…”

Section: Previous Studies On Jacking Forcesmentioning

confidence: 99%

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Impact of highly weathered geology on pipe-jacking forces

Choo

Ong

2017

Geotechnical Research

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, Malaysia, 7·7 km of trunk sewer lines were constructed in the highly fractured, highly weathered Tuang Formation using a pipe-jacking method. The pipelines were founded at depths of up to 35 m below Kuching City, where the majority of the pipe-jacking activities would traverse the Tuang Formation. Jacking forces in highly fractured geology are not well understood as most jacking force models were derived for drives traversing soils. Therefore, a novel method was developed, whereby equivalent rock strength characteristics were interpreted from direct shear testing on reconstituted tunnelling rock spoils. Tangential peak strength parameters, c 0 t,p and e 0 t,p , were developed from the nonlinear behaviour of the reconstituted spoils and applied to a wellestablished jacking model to assess arching and development of jacking forces from four documented drives. The backanalysed parameters l avg and r EV were used to demonstrate that geology had significantly affected the development of jacking forces. The back-analysis of the studied drives was successfully validated through finite-element modelling. This research shows that the developed parameters c 0 t,p and e 0 t,p and the back-analysed parameters l avg and r EV can be reliably used to predict jacking forces in highly fractured, highly weathered geology.

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Section: Discussionmentioning

confidence: 99%

Section: Back-analysis Of Measured Jacking Forces: Case Studiesmentioning

confidence: 99%

Section: Previous Studies On Jacking Forcesmentioning

confidence: 99%

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Impact of highly weathered geology on pipe-jacking forces

Choo

Ong

2017

Geotechnical Research

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“…Metagreywacke spoils achieved higher shear stress at peak state due to larger particle interlocking, attributed to the angularity of the particles. The use of conventional best-fit linear MohrCoulomb envelopes to characterise the strength of granular materials may over-estimate material shear strength of the tested samples at low and high confining pressures, while under-estimating material shear strength at intermediate stresses (Choo and Ong, 2015). Hence, the strength behaviours of the tested samples were characterised using a non-linear failure criterion.…”

Section: Direct Shear Test Resultsmentioning

confidence: 99%

Behaviour of reconstituted sand-sized particles in direct shear tests using PIV technology

Peerun

Ong

Choo

2016

JGS Special Publication

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This paper presents a study on the mechanical behaviour of reconstituted tunnelling rock spoils carried out using direct shear test. The objective is to study the Mohr-Coulomb (MC) failure criteria of sand and sand-sized spoils of metagreywacke based on their respective particle shapes. Particle motions were tracked using Particle Image Velocimetry (PIV) technique. A remotely controlled camera was used to capture sequential images, which were then processed using GeoPIV to produce particle movement vectors. The captured vectors were analysed to detect notable sample behaviours such as dilation and contraction, as well as particle interlocking and breakage. It was found that factors affecting cohesion include: a) effect of particle shapes and surface roughness; b) effect of confining stress and c) effect of particle interlocking and breakages.

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“…Among which, pipe jacking is a non-destructive trenchless technique used for installing pipes under the ground using a tunnel boring machine and hydraulic jacks located inside a launch jacking pit (Chapman & Ichioka, 1999;Choo & Ong, 2015;Khazaei, Shimada, Kawai, Yotsumoto, & Matsui, 2006;Pipe Jacking Association, 1995;Rahjoo, Najafi, Williammee, & Khankarli, 2012;Shimada, Khazaei, & Matsui, 2004). A shield is inserted into the ground through a launch shaft or reception shaft and cuts a bore.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Face Stability of Slurry Pipe Jacking Tunnel in Frozen Ground

Wen¹,

Shimada²,

Sasaoka³

et al. 2017

ESR

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In this paper, a series of parametric three-dimension numerical simulations were carried out to estimate the face stability and to calculate the minimum allowable slurry pressure of pipe jacking tunnel in frozen ground for the first time. In total, 5120 of simulation schemes were done with different ground temperature, diameter and cover thickness of tunnel, cohesion and friction angle of frozen soil. In order to figure out the optimal grouting pressure, 4 groups of additional simulations are computed with the uniform face support pressure of 0.5, 1.0, 1.5 and 2.0 times of horizontal stress, σ H , at tunnel axis. The qualitative analysis of heading face deformation mechanism and quantitative analysis between deformation profiles and influential factors were implemented to comprehend the heading face deformation characteristics when conducting pipe jacking tunnel in frozen ground. The results show that ground temperature plays a dominant role to control the face deformation of jacking tunnel in frozen ground. And, factors of tunnel diameter and cover thickness have relatively greater influence on the deformation regulation than that of shearing parameters of frozen soil, cohesion and friction angle. Finally, the minimum allowable slurry pressure for each simulation schemes are obtained, which may be used in construction the pipe jacking tunnel in frozen ground.

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Evaluation of Pipe-Jacking Forces Based on Direct Shear Testing of Reconstituted Tunneling Rock Spoils

Cited by 63 publications

References 36 publications

Impact of highly weathered geology on pipe-jacking forces

Impact of highly weathered geology on pipe-jacking forces

Behaviour of reconstituted sand-sized particles in direct shear tests using PIV technology

Numerical Analysis of Face Stability of Slurry Pipe Jacking Tunnel in Frozen Ground

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