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Fracture Toughness and Tensile Strength of Core Soil
The fracture toughness KIC of the silty clay, which is the core material of a high earth‐rock fill dam in China, was investigated by an improved three‐point bending beam loading assembly, and its tensile strength σt was determined by a uniaxial tension loading assembly. The influences of the water contents and the dry densities of the specimens on the parameters KIC and σt were also investigated. Based on the testing data and the reasonable analyses, a linear empirical relationship between the two parameters of the tested clay was suggested, which was KIC = 0.3546σt. The analyses of previous test results of the two parameters KIC and σt of other geomaterials including soils and rocks have shown that the two parameters of many soils and rocks are also linearly correlated by the equation KIC = ασt. But the proportionality coefficient and the coefficient of determination are different for different geomaterials and testing methods. Experimentally, the measurement of the fracture toughness of soils or rocks was more complicated and more expensive than that of the tensile strength. Therefore, the relation given here may provide a helpful method for estimating the fracture toughness from the tensile strength which can be measured more easily. In order to investigate the reasons for the relation more deeply, further theoretical and experimental studies are necessary.
Fracture Toughness and Tensile Strength of Core Soil
The fracture toughness KIC of the silty clay, which is the core material of a high earth‐rock fill dam in China, was investigated by an improved three‐point bending beam loading assembly, and its tensile strength σt was determined by a uniaxial tension loading assembly. The influences of the water contents and the dry densities of the specimens on the parameters KIC and σt were also investigated. Based on the testing data and the reasonable analyses, a linear empirical relationship between the two parameters of the tested clay was suggested, which was KIC = 0.3546σt. The analyses of previous test results of the two parameters KIC and σt of other geomaterials including soils and rocks have shown that the two parameters of many soils and rocks are also linearly correlated by the equation KIC = ασt. But the proportionality coefficient and the coefficient of determination are different for different geomaterials and testing methods. Experimentally, the measurement of the fracture toughness of soils or rocks was more complicated and more expensive than that of the tensile strength. Therefore, the relation given here may provide a helpful method for estimating the fracture toughness from the tensile strength which can be measured more easily. In order to investigate the reasons for the relation more deeply, further theoretical and experimental studies are necessary.
Fracture Toughness and Tensile Strength of Core Soil
Wang, Jun‐Jie (author)
2014-03-10
30 pages
Article/Chapter (Book)
Electronic Resource
English
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