Study on the Influence of Freeze-thaw Cycle on the Permeability of Compacted Tailings Consolidation Body
Aiming at the problem of instability of tailings consolidated body under freeze-thaw condi-tions,compaction method was used to improve the consolidated body.Through indoor permeability test and mercury intrusion test,the permeability characteristics of compacted tailings consolidated body under differ-ent freeze-thaw modes were studied,and the mechanism of compaction effect on frost resistance of consoli-dated body was studied from the micro level.The test results show that under the open freeze-thaw mode,the attenuation of the permeability coefficient of the compacted tailings consolidated body is greater than that un-der the closed freeze-thaw mode.After 10 cycles,the permeability coefficient of the former is distributed in the order of 10-6,and the latter is distributed in the order of 10-7.Under compaction conditions,with the in-crease of initial water content,the permeability coefficient of the consolidated body increases first and then decreases.The optimal initial moisture content is 16%.Under this moisture content,the permeability coeffi-cient of the consolidated body is always the smallest with the influence of freeze-thaw action.Therefore,in or-der to ensure the safety and stability of the tailings consolidated body under the condition of freeze-thaw cy-cle,it is necessary to compact it,and at the same time,relevant measures such as water source isolation should be taken to prevent the aggravation of freeze-thaw damage.The research results provide a theoretical basis for improving the safety and stability of tailings consolidation pile under freeze-thaw conditions.
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