Effect of cutting blind zones on the performance of the rectangular pipe jacking machine with multiple cutterheads: A DEM study

Guo, Yidong; Jin, Dalong; Li, Xinggao; Cheng, Panpan; Qiao, Guogang; Wang, Quanxian; Yang, Yi

doi:10.1016/j.tust.2023.104984

Cited by 7 publications

(3 citation statements)

References 50 publications

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“…The discrete element method (DEM) was first proposed by Cundall and Strack, its core idea is to simulate the actual research object through many particle units, and to reflect the mechanical behavior of the solid structure or microstructure by solving the motion state of each particle. Currently, it has been widely used in geotechnical engineering, mining engineering, mechanical engineering, etc., especially for bulk material, such as soil particles [22][23][24]26]. To further study the disturbance of pipe section to the soil around the pipe body in the process of pipe jacking, the discrete element numerical simulation analysis by EDEM software is carried out.…”

Section: Comparative Analysis On Pipe-soil Frictional Resistance Of J...mentioning

confidence: 99%

Comparative research on the pipe-soil frictional resistances of circular and rectangular pipe sections during trenchless pipe jacking

Wen,

Zhang,

Xiang

2024

PLoS ONE

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Pipe jacking is a trenchless construction method to achieve forward tunneling and efficient construction of underground structure simultaneously without extensive surface excavation. In the process of pipe jacking construction, the jacking force provided by the hydraulic jacking equipment must overcome the frontal resistance of the cutter head and the frictional resistance between the pipe sections and formation at the same time. In particular, the pipe-soil frictional resistance increases with the increases of jacking distance, buried depth, pipe diameter and the complexity of jacking trajectory. Therefore, it is very important to correctly estimate jacking force in trenchless jacking engineering practice for the smooth implementation of pipe jacking, operation risk and comprehensive cost control. Firstly, the stress states of jacking circular and rectangular pipe sections in the soil are analyzed, and the key influencing factors of their pipe-soil frictional resistance are obtained respectively. Then, the pipe-soil frictional resistance of jacking the circular and rectangular pipe sections with the same external surface area in the dry sandy soil and coal granular layer are tested separately by using the self-developed multifunctional experimental apparatus during trenchless pipe jacking. The results show that the pipe-soil frictional resistances of jacking circular and rectangular pipe sections in the coal granular layer are always smaller than that in the sandy soil under the same experimental conditions, and the corresponding fitting calculation equation of pipe-soil frictional resistances are obtained respectively. Meanwhile, the modified calculation methods of the above pipe-soil frictional resistances are proposed respectively based on the relationship between the lateral pressure coefficient K and the buried depth of pipe section H. Moreover, the disturbed area of soil in the upper part of jacking circular pipe section presents an arc distribution, while the disturbed area of soil in the upper part of jacking rectangular pipe section presents a slightly concave distribution. Due to the different disturbance conditions of soil around the pipe section, the lateral pressure coefficient K should be corrected in the calculation equations of pipe-soil frictional resistance of jacking circular and rectangular pipe sections based on the discrete element numerical simulation analysis by EDEM software. Finally, the pipe-soil frictional resistances obtained by different methods in the sandy soil are compared and analyzed. The calculated values of the modified theoretical calculation method are very close to the experimental test values, while the other methods are smaller than the experimental test values, which makes the rationality of the modified theoretical calculation method of pipe-soil frictional resistance is verified, and some suggestions are also put forward for the value of some coefficients in the relevant empirical estimation equations. The above research achievements systematically compared the states of pipe-soil frictional resistances of jacking circular and rectangular pipe sections based on different research methods, especially for the correct evaluation of jacking force during trenchless pipe jacking, they could provide some valuable references and effective guidance for the subsequent research, engineering practice and further development of trenchless pipe jacking technology.

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Section: Comparative Analysis On Pipe-soil Frictional Resistance Of J...mentioning

confidence: 99%

Comparative research on the pipe-soil frictional resistances of circular and rectangular pipe sections during trenchless pipe jacking

Wen,

Zhang,

Xiang

2024

PLoS ONE

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“…For simplification, the spherical particle was adopted to describe the strength properties and fluidity of the actual soil [21,22]. In this study, to characterize the adhesion among the conditioned soil grains, the Hertz-Mindlin (H-M) with the Johnson-Kendall-Roberts (JKR) model was chosen for inter-particle contact behavior [23].…”

Section: Parameter Calibrationmentioning

confidence: 99%

Shield Attitude Adjustment Induced by Slurry Pressure Balance (SPB) Shield Tunneling Considering the Effects of Overbreak Cutter: A Numerical Simulation by DEM and Engineering Application

et al. 2023

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Based on a cross-river tunnel of Wuhan Metro Line 8, we present a two-dimensional discrete element model for shield attitude adjustment considering the effect of overbreak cutters. The shield shell mechanics under the influence of over-excavation rate, over-excavation orientations, and overburden load are simulated, and the tunneling mechanics law and the ultimate range during the adjustment of the shield attitude are investigated. The simulation results indicate the following: (1) The greater the over-excavation rate, the smaller the force exerted by the soil layer in the negative direction of the shield movement; therefore, increasing the over-excavation rate is helpful in expanding the range of shield attitude adjustment. (2) The shield is stressed symmetrically while conducting positive and negative horizontal adjustments in the soil layer, which has a symmetrical distribution, but vertical upward adjustment is more difficult than vertical downward adjustment. (3) With the increase in overburden load, the space of the shield attitude adjustment is gradually reduced at the same over-excavation rate. A good engineering application was achieved in this project using the simulation model. It is recommended to use the attitude adjustment method by controlling the tunneling parameters. In difficult situations such as high overlying loads, the over-excavation cutter can be used to assist in adjusting the shield attitude.

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“…In pipe jacking engineering, the synchronous grouting method is extensively employed in the construction of municipal and river-crossing pipeline engineering all over the world. It is also called slurry pipe jacking [ 1 , 2 , 3 , 4 ]. The pipeline segments are lifted smoothly and effectively thanks to the thixotropy properties of the synchronous grouting slurry.…”

Section: Introductionmentioning

confidence: 99%

Orthogonal Design and Microstructure Mechanism Analysis of Novel Bentonite Polymer Slurry in Pipe Jacking

et al. 2023

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The selection of an appropriate slurry ingredient and its percentage ratio is a vital and necessary task for engineers in slurry pipe jacking operations. However, traditional bentonite grouting materials are difficult to degrade because of their single and non-biodegradable composition. Nowadays crosslinked polymers have been widely considered due to their excellent performance and application in engineering practices, which enlighten novel polymer slurry in pipe jacking. This study innovatively proposed using boric acid crosslinked polymers added into polyacrylamide bentonite slurry, which not only solves the shortcomings of traditional grouting materials but also meets the general working performance requirements. The new slurry’s funnel viscosity, filter loss, water dissociation ratio and dynamic shear were tested according to an orthogonal experiment. Single factor range analysis was conducted to identify the optimal mix proportion based on an orthogonal design, and the formation behavior of mineral crystals and microstructure characteristics were evaluated by X-ray diffraction and scanning electron microscopy respectively. According to the results, guar gum and borax form a dense boric acid crosslinked polymer through cross-linking reaction. The internal structure grew tighter and more continuous as the crosslinked polymer concentration grew. It improved the anti-permeability plugging action and viscosity of slurries by 36.1~94.3%. The optimal proportions of sodium bentonite, guar gum, polyacrylamide, borax, and water were 10%, 0.2%, 0.25%, 0.1%, and 89.45% respectively. All these works indicated that the improvement of slurry composition by using boric acid crosslinked polymers was feasible.

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Effect of cutting blind zones on the performance of the rectangular pipe jacking machine with multiple cutterheads: A DEM study

Cited by 7 publications

References 50 publications

Comparative research on the pipe-soil frictional resistances of circular and rectangular pipe sections during trenchless pipe jacking

Comparative research on the pipe-soil frictional resistances of circular and rectangular pipe sections during trenchless pipe jacking

Shield Attitude Adjustment Induced by Slurry Pressure Balance (SPB) Shield Tunneling Considering the Effects of Overbreak Cutter: A Numerical Simulation by DEM and Engineering Application

Orthogonal Design and Microstructure Mechanism Analysis of Novel Bentonite Polymer Slurry in Pipe Jacking

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