Analysis Of the Mechanism of Soil : 1st Report. Cutting Patterns of Soils

Hatamura, Yotaro; Chijiiwa, Kenji

doi:10.1299/jsme1958.18.619

Cited by 6 publications

(7 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…4). It is well known from Mohr-Coulomb theory that granular materials fail along planes which are inclined at an angle of π/4 − φ/2, φ being the internal friction angle, to the direction of major principal stress (which happens to be the direction of cutting in our case [10]). These planes have been termed as Coulomb rupture planes.…”

Section: Determination Of Shear Band Inclination Anglementioning

confidence: 88%

An experimental study on shear bands in sand using the orthogonal cutting setup

Hegde

Murthy

2021

EPJ Web Conf.

View full text Add to dashboard Cite

We study the evolution of shear bands in granular media subjected to very large deformations using the orthogonal cutting geometry. We perform our cutting experiments on Cauvery Delta sand with d50 of 0.45mm. We also capture images of the cutting process which allows us to perform a PIV analysis to determine the deformation in material around the cutting tool. In our experiments we observe that the dynamic angle of repose of the pile that forms in-front of the tool as cutting progresses, approaches the critical state friction angle of the material. We observe a flow bifurcation around the tool as the material begins to slip along planes which are oriented at an angle of π/4 – θ/2, θ being the dynamic angle of repose, to the cutting direction. This leads to formation of shear bands/velocity jumps which contain around 14 particles. A measurement of dilation angle within the shear bands indicate that material is in a critical state of deformation.

show abstract

Section: Determination Of Shear Band Inclination Anglementioning

confidence: 88%

An experimental study on shear bands in sand using the orthogonal cutting setup

Hegde

Murthy

2021

EPJ Web Conf.

View full text Add to dashboard Cite

show abstract

“…More results of measurements can be found in Appendix M and Appendix N Hatamura and Chijiiwa (1975), (1976A), (1976B), (1977A) and (1977B) distinguished three failure mechanisms in soil cutting. The Shear Type, the Flow Type and the Tear Type.…”

Section: The Snow Plough Effectmentioning

confidence: 93%

“…Cutting Mechanisms. Hatamura and Chijiiwa (1975 A fourth failure mechanism can be distinguished ), the Curling Type, as is known in metal cutting. Although it seems that the curling of the chip cut is part of the flow of the material, whether the Curling Type or the Flow Type occurs depends on several conditions.…”

Section: Shear Strength Versus Frictionmentioning

confidence: 99%

“…Although calculation models for the determination of the cutting forces for dry soil, based on agriculture, were available for a long time (Hettiaratchi & Reece (1965), (1967A), (1967B), (1974 and Hatamura & Chijiiwa (1975 and (1977B) ) it is only since the seventies and the eighties that the cutting process in saturated sand is extensively researched at the Delft Hydraulics Laboratory, at the Delft University of Technology and at the Mineraal Technologisch Instituut (MTI, IHC).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The Delft Sand, Clay & Rock Cutting Model

Miedema

2019

View full text Add to dashboard Cite

In dredging, trenching, (deep sea) mining, drilling, tunnel boring and many other applications, sand, clay or rock has to be excavated. This book gives an overview of cutting theories. It starts with a generic model, which is valid for all types of soil (sand, clay and rock) after which the specifics of dry sand, water saturated sand, clay, atmospheric rock and hyperbaric rock are covered. For each soil type small blade angles and large blade angles, resulting in a wedge in front of the blade, are discussed. For each case considered, the equations/model for the cutting forces, power and specific energy are given. The models are verified with laboratory research, mainly at the Delft University of Technology, but also with data from literature.

show abstract

“…For soil cutting, Hatamura and Chijiiwa [5,6,7,8,9] have distinguished three failure mechanisms, The Shear Type, the Flow Type and the Tear Type. The Flow Type and the Tear Type usually occur in materials without an angle of internal friction.…”

Section: Underwater Excavation Theorymentioning

confidence: 99%

Numerical Modeling of Excavation Process in Dredging Engineering

Chen

Miedema

Rhee

2015

Procedia Engineering

View full text Add to dashboard Cite

The increase of world population has been requiring more and more lands for human activities, which is why the world dredging market has been significantly growing up during the past 20 years. In dredging engineering, underwater excavation process is one of the major procedures which involves complicated physics, no matter it is sand, clay or rock on the seabed. It is important to reasonably estimate the cutting force needed on the excavator blade, which will help to improve the design and reduce the wear of the equipment so that higher working efficiency can be achieved. However, it is known that the cutting force is greatly influenced by the local water pressure especially in deep water. The fluid flow will change the pore pressure distribution and meanwhile apply certain force to the solid particles. Since the experiments to measure the cutting force are expensive, a numerical model is then needed to describe the physics in it. In this paper, the author tends to use the discrete element modeling to describe the solid particle movement and particle-particle interactions, and the finite volume method to calculate the fluid pressure distribution and flow velocity. Besides, a coupling deck is used between the two models to exchange the information to describe the fluid-solid interaction. This research has proven the feasibility of applying such a method in the underwater excavation process. Further calibration and validation are still necessary depends on the soil properties of the seabed.

show abstract

Analysis Of the Mechanism of Soil : 1st Report. Cutting Patterns of Soils

Cited by 6 publications

References 0 publications

An experimental study on shear bands in sand using the orthogonal cutting setup

An experimental study on shear bands in sand using the orthogonal cutting setup

The Delft Sand, Clay & Rock Cutting Model

Numerical Modeling of Excavation Process in Dredging Engineering

Contact Info

Product

Resources

About