Mechanical properties of clayey soil relevant for clogging potential

Alberto-Hernandez, Yolanda; Kang, Chao; Yi, Yaolin; Bayat, Alireza

doi:10.1080/19386362.2017.1311086

Cited by 11 publications

(4 citation statements)

References 18 publications

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“…In this situation, the excavation operation should be stopped, and the cutting tools on the cutter head should be cleaned, and then the excavation operation should be resumed. This causes an increase in the excavation time, an increase in costs, and a decrease in excavation efficiency (Hernandez et al, 2018). The clogging occurs due to the adhesion between the soil and the cutter head and conveyor belt in EPB excavation machines.…”

Section: Introductionmentioning

confidence: 99%

The Effects of Water Content and Grain Size on the Clogging and Abrasivity of Fine-Grained Soils in Mechanized Excavation

Khoshzaher,

Chakeri,

Darbor

et al. 2023

MGPB

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Clogging during excavation is one of the common problems in mechanized excavation. Among the influential factors in clogging of the cutter head, we can mention the percentage of fine soil particles (under 200 mesh sieve), soil moisture, and soil type. In this study, to investigate the mechanism of tunnel excavation in the laboratory, a tunnel excavation machine laboratory simulator was designed and built. The features of this device are its horizontal operation, the low rotation speed of the cutter head, continuous contact of the pins with fresh soil during the test, and the continuous injection of additives with a specific injection pressure during the test. The effect of the percentage of fine-grained, soil moisture and the foam injection ratio (FIR) on clogging, energy consumed, and the average wear of cutting tools was studied. The results showed that with an increase in the percentage of fine soil particles from 90 to 100%, the clogging of cutting tools increased by 50%. Also, with an increase of soil moisture from a dry state to moisture content of 5%, clogging of the cutter head is insignificant, and after that, with an increase of moisture from 10 to 25%, clogging is increased by 178%, and the amount of energy consumed in each test is increased by 84%. In addition, by increasing the foam injection ratio from 40 to 60%, clogging decreased by 81% on average, and the wear of cutting tools decreased by 62% on average.

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Section: Introductionmentioning

confidence: 99%

The Effects of Water Content and Grain Size on the Clogging and Abrasivity of Fine-Grained Soils in Mechanized Excavation

Khoshzaher,

Chakeri,

Darbor

et al. 2023

MGPB

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“…The shear strength of the soil can then be calculated based on the measured torque and the dimensions of the vane [19]. Hernandez et al [20] used a fully automatic laboratory miniature vane shear device to measure the undrained shear strength of clay in different states. Zumsteg et al [21] used the MVST to measure the undrained shear strength of different mixtures of kaolinite conditioned by foam and polymers.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigations of Undrained Shear Strength of Sensitive Clay Using Miniature Vane Shear Tests

Shen

Wang

Chen

et al. 2023

JMSE

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The laboratory miniature vane shear test (MVST) has been widely used to measure the undrained shear strength of marine sediments in offshore engineering. However, the transfer of the soil sample in tube samplers from the seabed to the laboratory releases the in situ confining stress acting on the soil and will decrease the soil strength. In this research, in order to investigate the effects of confining stress on the undrained shear strength of marine sediments, the Coupled Eulerian-Lagrangian (CEL) approach in ABAQUS is used to model the three-dimensional standard and miniature vane shear tests to estimate the undrained shear strength of sensitive clay with different sensitivities under various stress conditions. Based on the numerical simulation results, a linear strength model that not only considers confining stress effects but also can eliminate the size effects caused by vane blades of MVST is proposed. The proposed model can be used to estimate the undrained shear strength of the sensitive clay under shallow seabed surfaces.

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“…Burbaum and Sass (2017) [3] conducted experiments to analyze the influence of two elements, i.e., the pore water tension (suction) of the soil and the permeability of the soil, on the adhesion of cohesive soils to solid surfaces, and presented the results of adhesion tests and pore water tension measurements during the adhesion tests. [14] indicated that the initial water content, the roughness of shear plate, and the percentage of additives have a significant effect on clogging potential, and an empirical diagram to understand the clogging potential by relating the clogging potential to soil properties was also plotted. The occurrence of the cutting head clogging is closely related to the physical and mechanical properties of the soils in the cutting face.…”

Section: Introductionmentioning

confidence: 99%

Criteria for Cutting Head Clogging Occurrence during Slurry Shield Tunneling

Yang

et al. 2022

Applied Sciences

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Cutting head clogging is more frequently encountered as more tunnels are being excavated by slurry shield machines. So establishing criteria for cutting head clogging occurrence based on the machine driving parameters is of great engineering significance. Three construction cases of the Beijing south-to-north water diversion auxiliary project, the Jinan Huanghe River Crossing tunnel construction, and the Wuhan Metro Line 8 Yangtze River Crossing tunnel construction, are introduced. Development of the main driving parameters in the construction cases, including the total thrust, the cutting head torque, the advance rate, and the cutting head rotation speed of the tunneling machines before, during, and after the cutting head clogging, are presented and analyzed. The fact is that the total thrust and the cutting head torque of tunneling machines will increase, or will not, once the cutting head clogging occurs. It is recommended to take two combined parameters of total thrust/penetration depth and cutting head torque/penetration depth into account to judge whether the cutting head clogging will occur or not. The maximum increases of the composite parameters by 2–6 times are found in the construction cases. But for the minimum increase, a 30–50% increase of the composite parameter should be noted. The findings can be of great help for similar projects.

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Mechanical properties of clayey soil relevant for clogging potential

Cited by 11 publications

References 18 publications

The Effects of Water Content and Grain Size on the Clogging and Abrasivity of Fine-Grained Soils in Mechanized Excavation

The Effects of Water Content and Grain Size on the Clogging and Abrasivity of Fine-Grained Soils in Mechanized Excavation

Numerical Investigations of Undrained Shear Strength of Sensitive Clay Using Miniature Vane Shear Tests

Criteria for Cutting Head Clogging Occurrence during Slurry Shield Tunneling

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