Small diameter tunnel excavation method using slurry pipe-jacking

Shimada, Hideki; Khazaei, Saeid; Matsui, Kikuo

doi:10.1023/b:gege.0000018365.84174.ea

Cited by 52 publications

(30 citation statements)

References 1 publication

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“…The mixture becomes slurry and is transported to ground level through slurry discharge pipes. SB method is most suited for conditions of high underground water pressure and various soil strata [46]. The choice of pipe material is determined by drive lengths, diameters of pipe, and ground conditions.…”

Section: Case Backgroundmentioning

confidence: 99%

Developing a risk assessment method for complex pipe jacking construction projects

Cheng

2015

Automation in Construction

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Section: Case Backgroundmentioning

confidence: 99%

Developing a risk assessment method for complex pipe jacking construction projects

Cheng

2015

Automation in Construction

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“…With the continuous development of the technology, the pipe jacking method has occupied a position in infrastructure construction [1,2]. In recent years, the research focus of pipe jacking has been the interaction between pipe string and surrounding complex soil environments [3][4][5], the indoor experiments [6][7][8][9][10], the numerical simulation [11][12][13], and the field investigation [14].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Complex Contact Frictional Property of an Ultralong Distance Large-Section Concrete Pipe Jacking and Prediction of Pipe String Stuck

Chen

2019

Advances in Materials Science and Engineering

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Line 2 of the Guanjingkou Pipe Jacking Project in Chongqing encountered a pipe sticking problem, whose occurrence was inevitably attributed to the higher total frictional resistance of pipe strings rather than the maximum jacking force. Line 1, which is about to start construction, has basically the same construction environment as Line 2 using the same microshield and pipe string sizes. To avoid repeating the pipe sticking problem of Line 2, the mutual friction characteristics between the surrounding rocks and jacked pipe strings are studied for Line 1 by adopting the same test method under seven complex contact conditions (the presence or various combinations of three substances, i.e., extrapipe string field debris, bentonite slurry, and sand-laden waste slurry, on the jacked pipe string-surrounding rock contact surface are mainly considered). The results show that sufficient bentonite slurry can effectively reduce the frictional resistance, and when the amount of bentonite is insufficient, the average friction coefficient (AFC) of the later contact surface increases by 50%∼70%. The comparison of the monitored versus predicted jacking forces indicates that the value predicted by the test is slightly higher than the monitored force and the variation trends of the two match well, thus proving the correctness of the test results. It is possible to continue predicting the variation trends of the jacking force and frictional resistance based on the contact situation outside the pipe string wall, which greatly lowers the probability of re-encountering pipe sticking. The test results not only explain the important role of bentonite slurry in reducing the pipe string wall frictional resistance but also suggest that an increase in the pipe string wall frictional resistance resulting from the complex contact inflow into the overexcavation gap is the root cause of pipe sticking; moreover, the number of jacked pipe strings matching a single IJS is the second cause of pipe string sticking. The methodology of this study can provide a reference for other studies concerning the jacking force of long-distance rock microshield tunnelling.

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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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Small diameter tunnel excavation method using slurry pipe-jacking

Cited by 52 publications

References 1 publication

Developing a risk assessment method for complex pipe jacking construction projects

Developing a risk assessment method for complex pipe jacking construction projects

Experimental Study on the Complex Contact Frictional Property of an Ultralong Distance Large-Section Concrete Pipe Jacking and Prediction of Pipe String Stuck

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

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