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Vol 185
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Determination of indices of strength certificate оf rocks using the method of specimens failure with spherical indentors

V. A. Korshunov1
Yu. M. Kartashov2
V. A. Kozlov3
About authors
  • 1 — Ph.D. Senior research assistant Saint Petersburg State Mining Institute (Technical University)
  • 2 — Ph.D., Dr.Sci. Chief Research assistant Saint Petersburg State Mining Institute (Technical University)
  • 3 — Senior research assistant Saint Petersburg State Mining Institute (Technical University)
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The method has been developed for the determination of indices of strength certificate of rocks using the technique of specimen’s failure with oncoming spherical indentors. This method is based on the assessment of ultimate stresses acting in the tensile plane and within the zones of failured rocks under action of indentors at the moment of sample splitting. Formulas were obtained for calculation of indices of strength certificate, i.e. cohesion and angles of internal friction under tensile compression and nonuniform triaxial compression, ultimate strength in uniaxial compression and tension. This method is applicable in situ conditions.

rocks strength certificate cohesion angle of internal friction spherical indentors
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  1. Методика определения прочности горных пород на образцах полуправильной формы / А.И.Берон, М.И.Койфман, С.Е.Чирков, И.А.Соломина / Институт горного дела им.А.А.Скочинского. М., 1976. 40 с.
  2. Коршунов В.А. Определение показателей объемной прочности горных пород при их нагружении сферическими инденторами // Горная геомеханика и маркшейдерское дело: Сборник научных трудов / ВНИМИ. СПб, 1999. С.70-75.
  3. Прочность и деформируемость горных пород / Ю.М.Карташов, Б.В.Матвеев, Г.В.Михеев, А.Б.Фадеев. М.: Недра, 1979. 269 с.
  4. Bieniawski Z.T. The point-load strength test in geotechnical practice. Engineering Geology. 9 (1975). Р.1-11.

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