Journal
ROCK MECHANICS AND ROCK ENGINEERING
Volume 55, Issue 2, Pages 923-936Publisher
SPRINGER WIEN
DOI: 10.1007/s00603-021-02718-2
Keywords
Hoek-Brown criterion; Porosity; Hoek-Brown parameter; Rock strength; Laboratory tests
Funding
- National Natural Science Foundation of China [42177158, 11902249, 11872301]
- Natural Science Foundation of Shaanxi Province [2019JQ395]
- Education Department of Shaanxi Province [20JS093]
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The study proposes a new model to investigate the relationship between porosity and rock strength ratios, modifying the Hoek-Brown criterion to incorporate porosity instead of constants m(i) and s. Various rock tests show that the modified criterion effectively represents the impact of porosity on rock failure envelopes and can be used to estimate rock porosity and strength parameters.
Rock strength parameters are substantially impacted by porosity. This paper proposes a new model for presenting the relationship between porosity and the ratio of the unconfined compressive strength to the tensile strength of rock. The correlation between porosity and the constant m(i) of the Hoek-Brown (H-B) criterion is studied. To consider the effect of porosity on the rock strength ratio, the H-B criterion is modified by incorporating porosity instead of the H-B constants m(i) and s. A series of uniaxial, triaxial and Brazilian tests are conducted on various types of rocks (sedimentary, metamorphic and magmatic rocks) to study the effect of porosity on rock strength characteristics. The modified H-B criterion provides a good representation of the effect of porosity on the failure envelopes of rock. The modified criterion can be used to estimate the porosity and strength parameters of rock.
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