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- https://eng.libretexts.org/Bookshelves/Civil_Engineering/Book%3A_The_Delft_Sand_Clay_and_Rock_Cutting_Model_(Miedema)/16%3A_Exercises/16.05%3A_Chapter_5-_Dry_Sand_CuttingWhich of the following statements are true in the case only the weight of the soil is considered if dry sand is excavated with blade angles above 30 o ? \cos (\alpha+\beta) \cdot \sin (\alpha+\beta+\d...Which of the following statements are true in the case only the weight of the soil is considered if dry sand is excavated with blade angles above 30 o ? \cos (\alpha+\beta) \cdot \sin (\alpha+\beta+\delta+\varphi)+\sin (\alpha+\beta) \cdot \cos (\alpha+\beta+\delta+\varphi)=\sin (2 \cdot \alpha+2 \cdot \beta+\delta+\varphi)=0\\
- https://eng.libretexts.org/Bookshelves/Civil_Engineering/Book%3A_The_Delft_Sand_Clay_and_Rock_Cutting_Model_(Miedema)/15%3A_A_Wedge_in_Hyperbaric_Rock_Cutting/15.01%3A_IntroductionFor completeness of the overview the equations for the cutting of the wedge mechanism for hyperbaric rock are given here without further explanation. A: The wedge tip. B: End of the shear plane. C: Th...For completeness of the overview the equations for the cutting of the wedge mechanism for hyperbaric rock are given here without further explanation. A: The wedge tip. B: End of the shear plane. C: The blade top D: The blade tip. A-C: The wedge surface. D-C: The blade surface. h b : The height of the blade. h i : The thickness of the layer cut. α: The blade angle. F h : The horizontal force, the arrow gives the positive direction. F v : The vertical force, the arrow gives the positive direction.
- https://eng.libretexts.org/Bookshelves/Civil_Engineering/Book%3A_The_Delft_Sand_Clay_and_Rock_Cutting_Model_(Miedema)/06%3A_Saturated_Sand_Cutting/6.03%3A_Cutting_Theory_LiteratureCutting tests along a windowpane gave an image in which the shape of the shear plane was more in accordance with the so-called "stress characteristics" than with the so-called "zero-extension lines". ...Cutting tests along a windowpane gave an image in which the shape of the shear plane was more in accordance with the so-called "stress characteristics" than with the so-called "zero-extension lines". Therefore, for the calculation of the cutting forces, the "stress characteristics method" is used (Mohr-Coulomb failure criterion).
- https://eng.libretexts.org/Bookshelves/Civil_Engineering/Book%3A_The_Delft_Sand_Clay_and_Rock_Cutting_Model_(Miedema)/11%3A_A_Wedge_in_Dry_Sand_Cutting/11.06%3A_NomenclatureSum of N 2 and S 2 on the pseudo blade (front of the wedge). Length of the line from the tip of the blade to the opposite side of the wedge and perpendicular to this side. Length of the line from poin...Sum of N 2 and S 2 on the pseudo blade (front of the wedge). Length of the line from the tip of the blade to the opposite side of the wedge and perpendicular to this side. Length of the line from point A to the intersection point of the previous line with side A-C. Distance from the acting point of the pore pressure force on side A-C to the intersection point of the previous line L 6 with side A-C. Shear (friction) force on the pseudo blade (front of the wedge).
- https://eng.libretexts.org/Bookshelves/Civil_Engineering/Book%3A_The_Delft_Sand_Clay_and_Rock_Cutting_Model_(Miedema)/16%3A_Exercises/16.03%3A_Chapter_3-_The_General_Cutting_ProcessThe snow plough effect occurs when the sum of the 4 angles in the argument of the sine in the denominator of the generic cutting equation is larger than 180 degrees. The snow plough effect occurs when...The snow plough effect occurs when the sum of the 4 angles in the argument of the sine in the denominator of the generic cutting equation is larger than 180 degrees. The snow plough effect occurs when the sum of the 4 angles in the argument of the sine in the denominator of the generic cutting equation is equal to 180 degrees. The snow plough effect will occur when the angle between the cutting velocity and the blade edge is larger than 90 degrees.
- https://eng.libretexts.org/Bookshelves/Civil_Engineering/Book%3A_The_Delft_Sand_Clay_and_Rock_Cutting_Model_(Miedema)/06%3A_Saturated_Sand_Cutting/6.02%3A_DefinitionsFigure 6-1: The cutting process definitions. Definitions: A: The blade tip. B: End of the shear plane. C: The blade top. A-B: The shear plane. A-C: The blade surface. h b : The height of the blade. h ...Figure 6-1: The cutting process definitions. Definitions: A: The blade tip. B: End of the shear plane. C: The blade top. A-B: The shear plane. A-C: The blade surface. h b : The height of the blade. h i : The thickness of the layer cut. v c : The cutting velocity. α: The blade angle. β: The shear angle. F h : The horizontal force, the arrow gives the positive direction. F v : The vertical force, the arrow gives the positive direction.
- https://eng.libretexts.org/Bookshelves/Civil_Engineering/Book%3A_The_Delft_Sand_Clay_and_Rock_Cutting_Model_(Miedema)/09%3A_Rock_Cutting-_Hyperbaric_Conditions/9.04%3A_The_Curling_Type\[\ \mathrm{B}= \frac{\lambda_{1} \cdot \mathrm{p}_{2 \mathrm{m}} \cdot \sin (\delta) \cdot \cos (\varphi)-\lambda_{2} \cdot \mathrm{p}_{1 \mathrm{m}} \cdot \cos (\delta) \cdot \sin (\varphi)}{\sin (\...\[\ \mathrm{B}= \frac{\lambda_{1} \cdot \mathrm{p}_{2 \mathrm{m}} \cdot \sin (\delta) \cdot \cos (\varphi)-\lambda_{2} \cdot \mathrm{p}_{1 \mathrm{m}} \cdot \cos (\delta) \cdot \sin (\varphi)}{\sin (\alpha) \cdot \sin (\beta)} \cdot \mathrm{h}_{\mathrm{i}} +\frac{-\mathrm{c} \cdot \lambda_{2} \cdot \cos (\delta) \cdot \cos (\varphi)+\mathrm{a} \cdot \lambda_{1} \cdot \cos (\varphi) \cdot \cos (\delta)}{\sin (\alpha) \cdot \sin (\beta)} \cdot \mathrm{h}_{\mathrm{i}} \tag{9-25}\]
- https://eng.libretexts.org/Bookshelves/Civil_Engineering/Book%3A_The_Delft_Sand_Clay_and_Rock_Cutting_Model_(Miedema)/12%3A_A_Wedge_in_Saturated_Sand_Cutting/12.04%3A_The_Equilibrium_of_MomentsThe statement that the sand on the blade is not moving is based on two things, first of all if the sand is moving with respect to the blade, the soil interface friction is fully mobilized and the bott...The statement that the sand on the blade is not moving is based on two things, first of all if the sand is moving with respect to the blade, the soil interface friction is fully mobilized and the bottom of the wedge requires to have a small angle with respect to the horizontal in order to make a flow of sand possible.
- https://eng.libretexts.org/Bookshelves/Civil_Engineering/Book%3A_The_Delft_Sand_Clay_and_Rock_Cutting_Model_(Miedema)/14%3A_A_Wedge_in_Atmospheric_Rock_Cutting
- https://eng.libretexts.org/Bookshelves/Civil_Engineering/Book%3A_The_Delft_Sand_Clay_and_Rock_Cutting_Model_(Miedema)/16%3A_Exercises/16.01%3A_IntroductionThis book is used for the courses OE4607 Introduction Dredging Engineering and OE4626 Dredging Processes I of the MSc program Offshore & Dredging Engineering of the Delft University of Technology. The...This book is used for the courses OE4607 Introduction Dredging Engineering and OE4626 Dredging Processes I of the MSc program Offshore & Dredging Engineering of the Delft University of Technology. The exercises are questions of the exams. After each exam, the new questions will be added to this chapter.
- https://eng.libretexts.org/Bookshelves/Civil_Engineering/Book%3A_The_Delft_Sand_Clay_and_Rock_Cutting_Model_(Miedema)/14%3A_A_Wedge_in_Atmospheric_Rock_Cutting/14.02%3A_The_Equilibrium_of_ForcesThis force can be calculated by multiplying the cohesive shear strength \(\ \tau_\mathrm{c}\) of the soil with the contact area between the soil and the pseudo blade. If the forces N 2 and S 2 are com...This force can be calculated by multiplying the cohesive shear strength \(\ \tau_\mathrm{c}\) of the soil with the contact area between the soil and the pseudo blade. If the forces N 2 and S 2 are combined to a resulting force K 2 and the adhesive force and the water under pressures are known, then the resulting force K 2 is the unknown force on the blade.
