Modified PTS test and clump modeling on mixed mode crack growth in granite

J. S. Lee, J. Kemeny, T. Y. Ko

Research output: Contribution to conferencePaper

2 Scopus citations

Abstract

This paper describes the development of a new test for measuring the mode II fracture toughness for rock, KIIC. The test is called the Modified Punch Through Shear test (MPTS), which is a modification of the PTS test developed by [4]. Laboratory MPTS tests on Columbia granite were conducted. The lab tests and finite element modeling reveal that a valid shear crack is produced. Tests conducted at different confining stresses show that the shear cracking strength is a function of confining stress. Tests at each confinement were repeated 7 times, and even though the scatter in the results is large, best-fit results for shear cracking strength as a function of confining stress were determined. PFC modeling has also been conducted to simulate in detail the development of tensile and shear cracks in the MPTS test. A clump model rather than the standard Circular Particle Interaction (CPI) model was used to improve the strength envelope.

Original languageEnglish (US)
StatePublished - Dec 1 2006
Event41st U.S. Rock Mechanics Symposium - ARMA's Golden Rocks 2006 - 50 Years of Rock Mechanics - Golden, CO, United States
Duration: Jun 17 2006Jun 21 2006

Other

Other41st U.S. Rock Mechanics Symposium - ARMA's Golden Rocks 2006 - 50 Years of Rock Mechanics
CountryUnited States
CityGolden, CO
Period6/17/066/21/06

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ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

Lee, J. S., Kemeny, J., & Ko, T. Y. (2006). Modified PTS test and clump modeling on mixed mode crack growth in granite. Paper presented at 41st U.S. Rock Mechanics Symposium - ARMA's Golden Rocks 2006 - 50 Years of Rock Mechanics, Golden, CO, United States.