Stress-Strain Relationship and Damage Constitutive Model of Cemented Tailings Backfill Under Uniaxial Compression
HOU Yongqiang1,2, YIN Shenghua1,2,*, CAO Yong1,2, YANG Shixing1,2, ZHANG Minzhe1,2
1 School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China 2 Key Laboratory of High-Efficient Mining and Safety of Metal Mines, Ministry of Education, Beijing 100083, China
Abstract: In order to systematically study the influence of curing age on the basic mechanical properties, stress-strain relations and failure modes of cemented tailings backfill, uniaxial compression tests were carried out on the cemented tailings backfill (CTB) specimens at different curing ages. Then, a segmented damage constitutive model considering curing age was established based on damage mechanics theory. The research shows that the compressive strength and elastic modulus of CTB specimens increase exponentially with curing age increasing. And the increasing rate of compressive strength decreases with the cement-sand ratio increasing in late-age curing. According to the stress-strain curve of CTB spe-cimens, the expression of stress-strain relationship under uniaxial compression for CTB specimens was proposed. Moreover, the validity of the formula was verified by comparing the measured value with the theoretical value. When the curing age exceeds 7 d, the deformability of CTB specimens which have the high content of cement is reduced with curing age increasing. However, the deformability of CTB specimens which have the low content of cement has positive relationship with curing age. Therefore, the curing age has a significant effect on the failure mode of CTB specimens, and the actual effect is closely related to the cement content in the backfill.
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