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Rock Damage Constitutive Model Based on the Modified Logistic Equation under Freeze–Thaw and Load Conditions
The stress–strain curves of red sandstone are obtained by performing conventional triaxial compression tests after freeze–thaw cycling. The loss rates of red sandstone under the action of freeze–thaw cycles are expressed by the extreme stress and elastic modulus. The logistic curve is an S-shaped curve, which is consistent with the damage development trend of rock subjected to freeze–thaw cycling during the loading process. Therefore, the logistic equation is adopted and modified to establish a damage constitutive model of rock under freeze–thaw and load conditions. The results show that with the increase in the number of freeze–thaw cycles, the damage to the rock is aggravated, the loss rates obtained from the extreme stress and elastic modulus gradually increase, the compressive strength decreases, and the plastic characteristics are enhanced. The confining pressure suppresses the damage of the rock, which macroscopically manifests as the enhancement of the compressive strength and plastic characteristics. The constitutive model derived using the modified logistic equation can effectively reflect the deformation and failure process of rock under freeze–thaw and load conditions. The model can be simply established, and the expressions of the model parameters can be obtained through the test parameters. Hence, the model can be widely used.
Rock Damage Constitutive Model Based on the Modified Logistic Equation under Freeze–Thaw and Load Conditions
The stress–strain curves of red sandstone are obtained by performing conventional triaxial compression tests after freeze–thaw cycling. The loss rates of red sandstone under the action of freeze–thaw cycles are expressed by the extreme stress and elastic modulus. The logistic curve is an S-shaped curve, which is consistent with the damage development trend of rock subjected to freeze–thaw cycling during the loading process. Therefore, the logistic equation is adopted and modified to establish a damage constitutive model of rock under freeze–thaw and load conditions. The results show that with the increase in the number of freeze–thaw cycles, the damage to the rock is aggravated, the loss rates obtained from the extreme stress and elastic modulus gradually increase, the compressive strength decreases, and the plastic characteristics are enhanced. The confining pressure suppresses the damage of the rock, which macroscopically manifests as the enhancement of the compressive strength and plastic characteristics. The constitutive model derived using the modified logistic equation can effectively reflect the deformation and failure process of rock under freeze–thaw and load conditions. The model can be simply established, and the expressions of the model parameters can be obtained through the test parameters. Hence, the model can be widely used.
Rock Damage Constitutive Model Based on the Modified Logistic Equation under Freeze–Thaw and Load Conditions
Meng, Xiangzhen (author) / Zhang, Huimei (author) / Liu, Xiaoyu (author)
2021-10-13
Article (Journal)
Electronic Resource
Unknown
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