วารสารวิจัย มข.
ปีที่ 20 | ฉบับที่ 3 กรกฎาคม - กันยายน 2558
ชื่อเรื่อง :
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Title :
Effects of Temperatures on Strength and Deformability of Tak Granite
ผู้แต่ง :
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Authors :
Kittikron Rodklang, Supattra Khamrat and Kittitep Fuenkajorn
บทคัดย่อ :
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Abstract :
Strength of granite under elevated temperatures is an important parameter governing
the long-term stability of waste disposal boreholes. The objective of this study is to
experimentally determine the effects of elevated temperatures on the compressive strengths
and elasticity of Tak granite. The rock strength and deformability are determined under
various temperatures and confining pressures. The confining stresses are maintained
constant at 0, 3, 7, to 12 MPa using a polyaxial load frame. The rectangular block
specimens have nominal dimensions of 5×5×10 cm3. The testing temperatures are varied
from 273 to 773 Kelvin. The results indicate that the granite strength and elasticity
exponentially decrease as the temperature increases. The distortional strain energy
criterion is proposed to describe the rock strengths as a function of mean strain energy.
The criterion fits well to the test results. The proposed strength criterion is useful to predict
the strength and deformation of granite around waste disposal boreholes under elevated
temperatures.
คำสำคัญ :
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Keywords :
strain energy; elevated temperature; strength; elasticity