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Experimental study on dynamic behavior of polyacrylamide-reinforced tailings
Yonghao Yang1,2, Feng Huang3,4, Zuoan Wei5
1State Key Laboratory of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University, Chongqing, 400074, China. yangyh@cqjtu.edu.cn.
Environmental Science and Pollution Research International
|February 4, 2023
Summary
Adding polyacrylamide to tailings improves their dynamic properties, enhancing seismic stability in tailings dams. This polymer reinforcement reduces pore water pressure buildup during seismic events.
Area of Science:
- Geotechnical Engineering
- Materials Science
Background:
- Tailings dam failures are often triggered by earthquakes.
- Improving the seismic stability of tailings dams is crucial for environmental safety.
- Polymers offer a potential solution for enhancing the dynamic properties of tailings.
Purpose of the Study:
- To investigate the effects of polyacrylamide reinforcement on the dynamic properties of tailings.
- To assess the seismic performance of polyacrylamide-modified tailings.
Main Methods:
- Dynamic triaxial tests were conducted on tailings samples.
- Polyacrylamide was added at a content of 0.3% to reinforced samples.
- Comparison of dynamic properties between reinforced and unreinforced tailings.
Main Results:
- Polyacrylamide reinforcement slightly increased cyclic liquefaction resistance, initial dynamic shear modulus, dynamic shear modulus, and dynamic shear modulus ratio.
- The damping ratio of reinforced tailings was lower at high dynamic shear strains.
- Polyacrylamide significantly decelerated the increase in dynamic pore water pressure during cyclic loading.
- The revised Zeng model accurately predicted pore-water pressure changes.
Conclusions:
- Polyacrylamide improves the structural and dynamic properties of tailings.
- Reinforced tailings exhibit enhanced seismic stability, crucial for tailings dam safety.
- Polyacrylamide is an effective additive for mitigating seismic risks in tailings dams.
