A new test device for the study of metal wear in conditioned granular soil used in EPB shield tunneling

Salazar, Cristina Gabriela Onate; Todaro, Carmine; Bosio, Federico; Bassini, Emilio; Ugues, Daniele; Peila, Daniele

doi:10.1016/j.tust.2017.12.014

Cited by 26 publications

(6 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The effect of soil conditioning on wear has been studied by Jakobsen et al [23] who pro posed a test device where a cross of prismatic bars is ro tated in the soil while Barbero et al [24] used an alumini um disk and measured the lost weight and the torque and Gharahbagh et al [20] used a different propeller with in clined blades. Oñate et al [25] proposed to use sharp steel blades that are rotated in the soil (Figure 4). Thanks to a detailed measurements of the blade's shapes before and triaxial device able to test samples with a diameter of 300 mm and a height of 600 mm (Figure 8).…”

Section: Wear Testsmentioning

confidence: 99%

See 1 more Smart Citation

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

Peila

Martinelli

Todaro

et al. 2019

Geomechanics and Tunnelling

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Wear Testsmentioning

confidence: 99%

“…Results of the permeability test on sand (D 10 = 0.08 mm; D 60 = 0.2 mm; w = 7 %): time taken by 2 l to pass through the sample, a well conditioned sample with FIR = 60 % is practically impervious[18] Wear tools used by Oñate et al[25]; tool cutting edge scanned by video-microscope after the test (magnification: 200×)…”

mentioning

confidence: 99%

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

Peila

Martinelli

Todaro

et al. 2019

Geomechanics and Tunnelling

Self Cite

View full text Add to dashboard Cite

show abstract

“…The muck with poor fluidity is likely to cause extra mechanical wear and inefficient muck discharging [1,2], while the excessive fluidity muck may lead to muck spewing and instability of the excavation face [3,4]. The "low plastic flow" state of muck is required to ensure the effective generation of chamber pressure and smooth discharging of muck [5][6][7]. In addition, it makes the muck easier to be cut, reduces the strength of the interface between cutting tools and the muck, and achieves the purpose of reducing the cutting tools wear.…”

Section: Introductionmentioning

confidence: 99%

The Role of Foam in Improving the Workability of Sand: Insights from DEM

Liu

Wang

et al. 2022

Minerals

View full text Add to dashboard Cite

Foam as a soil conditioner can transform the mechanical properties of the excavated natural muck and lubricate the interface between the cutting tools and muck, thus reducing the tools’ wear and promoting the efficiency of earth pressure balance (EPB) shield tunneling. This paper aims to explore the meso-mechanism of foam in improving the workability of sand by combining discrete element modeling (DEM) with experimental investigations of slump tests. A “sand-foam” mixture DEM model was generated by simplifying the sand grains and foam as individual particles with different properties. The particle-scale simulated parameters were calibrated based on a series of experimental observations. The effects of foam on the inter-particle contact distribution and the evolution of contact forces during the slumping process were investigated in detail through numerical modeling. It was found that injecting foam into sand specimens could increase the coordination number and the contact number around sand grains. Although the force transmission pattern changes from “sand-sand” into the coexistence of “sand-foam”, “sand-sand” and “foam-foam” contacts, the magnitude of contact forces transferred by foam particles is significantly lower than that by sand particles. The presence of foam reduces contact-scale frictional strength and thus reduces the stability of the microstructures of sand. In addition, the normal direction of inter-particle contact force deflects from the vertical to the horizontal and the magnitude of contact force decreases significantly with the influence of foam.

show abstract

“…Solid particle erosion at low speeds is common by working parts of industrial machinery and equipment whose surfaces are in direct contact with the hard particles (abrasives) and moving relative to them during operation (agricultural, mining equipment, tunneling and construction equipment, etc.). In studies of such wear form various laboratory devices (tribometers) are used, which are developed to investigate the wear of tools for tillage [1,2], tunneling [3][4][5] or mining [6,7]. Usual abrasives for these devices are different soil types or mixtures of soil and stone in dry or wet condition.…”

Section: Introductionmentioning

confidence: 99%

Effect of speed and impact angle on solid particle erosion of vanadium carbide coatings produced by thermo-reactive diffusion technique

Heffer¹,

Šimunović²,

Samarđžić³

et al. 2020

FME Transactions

View full text Add to dashboard Cite

This paper presents research of the solid particle erosion of conventionally and duplex treated vanadium carbide (VC) coatings produced on the C45E steel substrate by the thermo-reactive diffusion (TRD) technique. The Response Surface Methodology (RSM) based on Central Composite Design (CCD) was used to evaluate the effect of moving speed and impact angle as input variables on the erosive wear mass loss as the response. It was established that moving speed of the samples and the impact angle of the abrasive particles are statistically significant factors, while their interaction does not have significant effect on the wear process. The mathematical model of the investigated wear process was derived as well.

show abstract

A new test device for the study of metal wear in conditioned granular soil used in EPB shield tunneling

Cited by 26 publications

References 22 publications

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

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

The Role of Foam in Improving the Workability of Sand: Insights from DEM

Effect of speed and impact angle on solid particle erosion of vanadium carbide coatings produced by thermo-reactive diffusion technique

Contact Info

Product

Resources

About