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| Damage constitutive relation research in Different water condition of dolomite |
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Received:February 25, 2013
Revised:December 27, 2013
Accepted:February 27, 2013
Published Online:January 28, 2014
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| DOI： |
| KeyWord:dolomites; uniaxial compression; stress-strain; water absorption; damage variable; |
| Author | Institution |
| WU Yong |
Yunnan Institute of Building Research |
| LI Qian-kun |
China Coal Technology Engineering Group Nanjing Design Research Institute |
| ZHAO Bao-sheng |
Yunnan Institute of Building Research |
| LI Ke-gang |
Kunming University of Science and Technology, Kunming |
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| Abstract: |
| The stress -strain curves of dolomites can be confirmed by the uniaxial compression tests in the dry and the different water conditions,and the change of compression strength, elastic modulus, Poisson ratio with the water absorption were also got;Through defining the change of bibulous time as the damage variables,its variation law with the compression strength and elastic modulus were analyzed,when replacing the law with those,a new constitutive relation with bibulous time was be achieved. According to research: (1) From the constitutive relation should be compared to draw stress - strain curve and actual curve, the results indicated that: the majority agrees well with the actual,the model can well reflect the dolomite damage process under different soaking time, in this case, Weibull distribution parameter m determines the theoretical constitutive model for the shape of the curve.(2) considering the peak strength along with the statistical damage constitutive model of soaking time,by the model of stress - strain curves, for the fixed value, Weibull distribution parameter m values with increasing immersion time decreases first and then increases, parameter m values soaking conditions are always smaller than dry conditions, but in such cases, m cannot determine the constitutive model theory, the shape of the curve. |
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