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Mendoza Rizo, Jorge Alejandro (2010) MODELING ROCK CUTTING USING DEM WITH CRUSHABLE PARTICLES. Master's Thesis, University of Pittsburgh. (Unpublished)

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A numerical model for the rock scratching test using a sharp cutter is proposed in which the rock is represented by a bonded-particle model and its mechanical behavior is simulated by the Distinct-Element Method using the discrete element program PFC2D. The rocks that are simulated represent sandstones and their mechanical laboratory parameters are characterized by the ones obtained in laboratory test simulations using the same numerical approach and program named above. The environment of the rock scratching test is distinguished by the particle size and crushability, which are highly important parameters that affect the failure mode and the cutting force pattern. The implementation of a crushing criterion and strength is introduced to the particles based on micromechanics and laboratory results, respectively. The depth of cutting is considerably shallow and the cutting force results are processed under the physical concept of mechanical work. The proportion of the cutting force to the depth of cutting is possible in any type of sandstone-like simulated material, which has been demonstrated by laboratory results. The correlation of the cutting force and the unconfined compressive strength of different rock scratching tests show that the simulations provide effective results. The failure characteristics of micro-cracks and macro-cracks under the cutting tool, represented by broken bonds, simulates the damage occurring in real scratching tests, taking the model to a realistic plane.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Mendoza Rizo, Jorge Alejandrojam255@pitt.eduJAM255
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairLin, Jeen-Shangjslin@pitt.eduJSLIN
Committee MemberBrigham, John Cbrigham@pitt.eduBRIGHAM
Committee MemberVallejo, Luis Evallejo@pitt.eduVALLEJO
Date: 25 June 2010
Date Type: Completion
Defense Date: 1 April 2010
Approval Date: 25 June 2010
Submission Date: 23 March 2010
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Institution: University of Pittsburgh
Schools and Programs: Swanson School of Engineering > Civil and Environmental Engineering
Degree: MSCE - Master of Science in Civil Engineering
Thesis Type: Master's Thesis
Refereed: Yes
Uncontrolled Keywords: DEM; particle crushing; rock cutting; specific energy
Other ID:, etd-03232010-185037
Date Deposited: 10 Nov 2011 19:32
Last Modified: 15 Nov 2016 13:37


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