Analysis on shield operational parameters to steer articulated shield

Huynh, Thanh; Chen, J.; Sugimoto, Masunori

doi:10.3208/jgssp.atc6-11

Cited by 10 publications

(8 citation statements)

References 6 publications

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“…When the horizontal deviation of the incision is 50, and 10 rings shall be rectified through geometric model calculation, and each ring shall be rectified by 5mm, falling into the setting range of deviation correction parameters with variation of deviation [2.0, 7.0]. Then, the parameter recommendation with variation of deviation [2,7]…”

Section: Application Example Analysismentioning

confidence: 99%

“…In fact, in order to control shield construction attitude deviation, the precise shield tunneling parameters and geological data analysis affecting the shield tunneling construction axis attitude control quality, such as the precise analysis of cutting azimuth and hinged joint angle and so on, should be done according to the shield construction process and mechanism data analysis in the actual shield tunneling process [7], [8]. For general subway shield tunnel construction, the above parameters are only set according to the experience of the drivers or the chief engineers, and the setting of tunneling and deviation correction parameters is blind.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Prediction of Axis Attitude Deviation and Deviation Correction Method Based on Data Driven During Shield Tunneling

et al. 2019

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Due to the complex shield construction characteristics and the complex effects of geological environment, it is difficult to control the direction of shield tunneling and to determine the reasonable tunneling parameters such as tunneling speed and so on. During the tunneling, shield tunneling machine may rise, shift and snake advance, which are not conducive to control tunnel axis. Aiming at the problem that it is difficult to accurately predict and correct the axis attitude deviation in the shield tunneling process, a prediction of axis attitude deviation and deviation correction method based on data driven during shield tunneling was put forward in this paper. Under certain geological conditions, the relationship between the attitude deviation of the construction axis and tunneling parameters during shield tunneling process with different tunneling mileages is established. Based on the tunneling historical data, the XGBoost prediction model is constructed, and the axis deviation variation is predicted and analyzed with the shield construction parameters. The multi-ring deviation correction parameter calculation model based on the fusion of geometric model and association rules is designed to obtain the internal correlation of the deviation amount, the number of deviation correction rings and the deviation correction parameters of each ring under the maximum deviation of different deviation correction sections, so as to realize the accurate prediction and deviation correction of shield axis deviation in the complex construction process. Under the verification of 155 ring data in a certain subway construction section, the method proposed in this paper has higher prediction accuracy, which is important for improving the safety and quality of shield tunneling. Results from the measured shield construction ring data verify the reasonability of the proposed axis attitude deviation prediction and multi-ring deviation correction method.

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Section: Application Example Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Prediction of Axis Attitude Deviation and Deviation Correction Method Based on Data Driven During Shield Tunneling

et al. 2019

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“…Consequently, the articulation is also an important small curvature tunneling influence factor as it affects ground loss. Huynh et al [12] implemented the confirmation of profiling knife length and articulation angle depending on the geometric conditions by means of numerical simulation with certain constraints set. In general, the environmental disturbance induced by ground loss, uneven loadings and articulation for small curve radius tunneling all increase.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of ground disturbance behavior during articulated shield tunneling on small radius curved routes in clays

Zhang,

Chen,

Zhang

et al. 2024

Preprint

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Current theoretical works on excavation-induced ground settlement in clays for small radius curve tunnels typically treat the shield as a continuous entity, neglecting the influence of the articulation device. Consequently, the accurate assessment of over-excavation effects resulting from changes in the small curvature shield excavation route is impossible. As regards the articulation and geometric relationship between the shield machine and tunnel excavation route, this paper develops formulae for calculating soil over-excavation amount and articulation angle at different positions during tunnel excavation. The clay soil settlement affected by multiple factors during the construction of an articulated shield is resolved via the mirror image method and Mindlin's solution, which takes into account articulation impacts. Additionally, the on-site monitoring data is utilized for comparison and verification with the proposed theoretical solution. It is demonstrated that the solution for small curvature excavation settlement involving the articulation effect achieves good conformance in predicting soil deformation. Finally, the parametric analyses are conducted to estimate the impact of the articulation device on the predicted ground settlement values in clay soil.

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“…But these methods have some shortage, for example, it can not count copy cutter effect, and it has no mechanical background due to measured data oriented. Authors developed the shield kinematic model [5] [6], and it was applied to simulation [7] [8] and prediction [9][10] of shield behaviour.…”

Section: Introductionmentioning

confidence: 99%

Case study on shield steering along a sharp curve

Sugimoto,

An,

Kinoshita

2023

IOP Conf. Ser.: Earth Environ. Sci.

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Due to ongoing development of shield tunnelling technologies, usage of more complicated tunnel alignments is increasing. Therefore, more proper steering of shield machines is expected. Shield behaviour is controlled mainly by copy cutter, articulation mechanism, and jack force, but these three shield steering parameters are not easy to be determined, because of their high co-linearity and varying geological conditions. A discharging tunnel with a sharp curve was planned by an articulated EPB type shield. Therefore, as a preliminary analysis, the required shield steering parameters for the planned tunnel were calculated by shield behaviour simulation, and the obtained shield steering parameters were compared with the shield equipped capacity. Furthermore, as a post-analysis, the shield behaviour simulation was carried out by using the site measured data, and the input parameters at the preliminary analysis were examined. Through this research, the followings were found: 1) in the preliminary analysis, the shield equipped capacity is enough to construct the tunnel; 2) in the post-analysis, it was required to increase the face resistance parameter and to decrease the effective rates of overcut and copy cutter length, to match the analysis shield behaviour to the measured one; and 3) the shield kinematic model can simulate shield behaviour reasonably.

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Analysis on shield operational parameters to steer articulated shield

Cited by 10 publications

References 6 publications

Prediction of Axis Attitude Deviation and Deviation Correction Method Based on Data Driven During Shield Tunneling

Prediction of Axis Attitude Deviation and Deviation Correction Method Based on Data Driven During Shield Tunneling

Evaluation of ground disturbance behavior during articulated shield tunneling on small radius curved routes in clays

Case study on shield steering along a sharp curve

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