Experimental investigation on viscoplastic parameters of conditioned sands in earth pressure balance shield tunneling

Meng, Qingchun; Qu, Fuzheng; Li, Shouju

doi:10.1007/s12206-011-0611-9

Cited by 28 publications

(5 citation statements)

References 21 publications

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“…Shield tunneling parameters can reflect the interaction between the geological conditions of the shield construction site and the shield machine [7]. The parameters are the external expression of certain geological conditions and can be used to identify the soil layer according to a large number of tunneling parameters.…”

Section: The Selection Of Shield Tunneling Parametersmentioning

confidence: 99%

Local fisher formation identification method based on shield tunneling parameters

Xu,

Liu,

Pan

2024

Fourth International Conference on Mechanical Engineering, Intelligent Manufacturing, and Automation Technology (MEMAT 2023)

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Neural network technology and statistical classification are often used to identify the stratum in the traditional shield construction. However, the linear relationship between the parameters of shield tunneling is not ideal after analyzing the parameters of shield tunneling by curve fitting and statistical regression. Is adopted in this paper, in order to improve the accuracy of formation to identify local Fisher discriminant analysis method, through the data in the construction process of shield machine, the real-time recognition: formation of randomly selected sample of 228 set of training samples to train the model, 68 groups of data, which can identify using KNN classifier to classify, soil layer identification accuracy of 80-100%. The experimental results show that the local Fisher formation identification model based on shield tunneling parameters can realize the online stratification discrimination in the process of shield tunneling, improve the construction efficiency of shield tunneling machine, and reduce the construction risk and cost.

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Section: The Selection Of Shield Tunneling Parametersmentioning

confidence: 99%

Local fisher formation identification method based on shield tunneling parameters

Xu,

Liu,

Pan

2024

Fourth International Conference on Mechanical Engineering, Intelligent Manufacturing, and Automation Technology (MEMAT 2023)

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“…The shear and rheological behaviour of the conditioned soil influence the extraction process. To evaluate these parameters both vane test [29] [30] [31] [32] [33] and direct shear tests [9] [34] have been performed. Martinelli et al [34] used a modified undrained direct shear box and demonstrated that a good conditioning reduces the shear strength of the mix.…”

Section: Shear Rheometer and Flow Testsmentioning

confidence: 99%

“…In these conditions, the mix changes its behaviour because the bubbles reduce their size and, consequently, their effectiveness in reduc ing the shear strength. Zumsteg et al [29], Psomas [30], Mooney et al [3], Mori et al [36], Meng et al [31] and Yi et al [33] evaluated the shear strength, the compressibility of the soil and the void index in pressurized chambers. Largescale pressure tests were proposed by Thewes and Steeb [37] and Martinelli [38].…”

Section: Pressurized Testsmentioning

confidence: 99%

Soil conditioning in EPB shield tunnelling – An overview of laboratory tests

Peila

Martinelli

Todaro

et al. 2019

Geomechanics and Tunnelling

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The application of full‐face mechanized tunnelling, mainly with EPB shielded machines, has widely increased in the last years and today it can be considered the key technology when tunnelling in soils above and below the water table. The applicability range of EPB machines has widened thanks on one side to the technological and mechanical progresses and on the other side to the quality and effectiveness of the conditioning products. No recognized standards are available for laboratory testing of conditioned soil and each research centre has developed its own procedures and methods. In this paper, an overview of the most frequently used procedures is presented and discussed briefly.

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“…In recent years, direct shears (Ehsan and Adam [ 20 ]; Psomas [ 21 ]; Houlsby and Psomas [ 22 ]) or modified vane shears (Zumstegt et al [ 23 ]; Messerklinger et al [ 24 ]; Zumsteg et al [ 25 ]; Mori et al [ 26 ]) have been used to study the effects of the loading rate and confining pressure on the mechanical properties of conditioned soils, and specially designed rheometers have been used to test the characteristic parameters (such as yield stress and viscosity) (Karmakar [ 27 ]; Meng et al [ 28 ]) of muck. In general, the results of this type of test method can simulate the influence of the pressure environment of the working chamber on the strength of muck to some extent and can characterize the viscoplastic parameters of muck.…”

Section: Introductionmentioning

confidence: 99%

Calculation model of the equivalent spiral shear stress of conditioned sand

Li¹,

Tan²

2019

PLoS ONE

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Soil is the medium that balances the soil and water pressure on the excavation surface of an earth pressure balance (EPB) shield machine, and the soil flow plasticity directly affects the working performance of the shield machine. The spiral shear stress is the main determinant of the soil flow plasticity. During the progress of the EPB shield screw conveyor normal operation, the shear effects between the muck in the spiral tube and the screw shaft, as well as the flight, are different from the shear action, such as the direct shear or the vane shear. The direct or vane shear test is now widely used to evaluate soil flow plasticity. To better investigate the shear properties between the soil and the shield conveyor casing, a model screw conveyor was developed. Based on the analysis of the stress conditions and the movement of the conditioned soil plug, the theoretical calculation model of the equivalent helical shear stress of the EPB shield screw conveyor was deduced based on the steady-state equilibrium conditions of moment of momentum. The conditioned standard sand was used in the indoor tests. The results of the indoor test of the model machine verified the rationality and effectiveness of the theoretical model. The model provides an important theoretical basis and references for the design and optimization of soil conditioning during shield tunneling.

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Experimental investigation on viscoplastic parameters of conditioned sands in earth pressure balance shield tunneling

Cited by 28 publications

References 21 publications

Local fisher formation identification method based on shield tunneling parameters

Local fisher formation identification method based on shield tunneling parameters

Soil conditioning in EPB shield tunnelling – An overview of laboratory tests

Calculation model of the equivalent spiral shear stress of conditioned sand

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