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| Effect of soluble salts on dynamics characteristics of manganese residue |
| WANG Ya1，2，WEI Zuoan1，2，LI Shilong1，2，WANG Wensong1，2，3，ZHENG Binbin4，LU Ting1，2 |
| (1. State Key Laboratory of Coal Mine Disaster Dynamics and Control，Chongqing University，Chongqing 400044，China；2. School of Resources and Safety，Chongqing University，Chongqing 400044，China；3. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection，Chengdu University of Technology，Chengdu，Sichuan 610059，China；4. School of Management Science and Engineering，Shandong Institute of Business and Technology，Yantai，Shandong 264005，China) |
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Abstract Manganese residue is a solid waste generated by the production of electrolytic manganese. And it contains soluble salts，which have a significant effect on its physical and mechanical properties. In this paper，the dynamic triaxial tests of two kinds of manganese residue，original and desalted states，were carried out. The effect of soluble salts in manganese residue on the dynamic characteristics was obtained，which provided a basis date for the earthquake response and seismic stability assessment of manganese residue pond. The results show that the hysteretic circle of desalted manganese residue decline faster than the original at the same conditions. Meanwhile，the hysteretic circle area and plastic deformation of original manganese residue are smaller than those of the desalted. The dynamic strength curves of the two kinds of manganese residue are both in the form of power function，but the desalted manganese residue is more easily damaged than the original. At the same condition，the maximum dynamic shear modulus and dynamic shear modulus of desalted manganese residue are both smaller than those of the original，but its damping is larger than original manganese residue. The Davidenkov model and Hardin model were used to fit the dynamic shear modulus ratio and damping ratio of manganese residue，respectively. And these two properties of desalted manganese residue are worse than those of the original. The dissolution of soluble salt would reduce the dynamic characteristics of manganese residue，thereby，affecting the seismic stability of manganese residue pond. Therefore，during the operation and management of manganese residue pond，special attention should be paid to the dissolution of soluble salts in manganese residue caused by rainfall infiltration.
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2022, Vol. 41 
