首页|A simple method for determining independent fracture toughness and tensile strength of rock
A simple method for determining independent fracture toughness and tensile strength of rock
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NETL
NSTL
万方数据
维普
This paper develops a model that only requires two sets of small-size rock specimens with the ratio of the structural geometry parameter maximum to minimum ae,max:ae,min≥3:1 to determine the rock fracture and strength parameters without size effect and predict the actual structural performance of rock.Regardless of three-point-bending,four-point-bending,or a combination of the above two specimen types,fracture toughness KIc and tensile strength ft of rock were determined using only two sets of spec-imens with ae,max:ae.miin≥3:1.The values KIc and ft were consistent with those determined using multiple sets of specimens.The full structural failure curve constructed by two sets of small-size specimens with ae.max:ae.min≥3:1 can accurately predict large-size specimens fracture failure,and±10％upper and lower limits of the curve can encompass the test results of large-size specimens.The peak load prediction curve was constructed by two sets of specimens with ae,max:ae,min≥3:1,and±15％upper and lower limits of the peak load prediction curve can cover the small-size specimen tests data.The model and method proposed in this paper require only two sets of small-size specimens,and their selection is unaffected by the spec-imen type,geometry,and initial crack length.
NETL
NSTL
万方数据
维普
