露天矿内排土场重构砂土垫层参数优化设计

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中图分类号：TD824.6 文献标志码：A

Parameter optimization design of reconstructed sand cushion layers for inner dumps in open-pit mines

JIALanl²，YANGYuemei1，CHENJianbingl，CAOLanzhu²，LIUHaixian

（1.CollegeofMining，LiaonngTechnicalUniversity，Fuxin23o0，China；.LiaoningInstituteofTechnologyandEquipmentforMineralResouresDevelopmentandUtilizationofHigherEducationInstitutions，Fuxin230oo，China; 3. Sino Sindh Resources （Pvt.）Ltd.， Shanghai 201100，China）

Abstract：Residual water inthesurroundingrock is a key factor that affects the slope stabilityof inner dumps in open-pit mines.Existing research on groundwater seepage in inner dumps has mainly focused on analyzing the effects of individual factors，such asrainfallor water level fluctuations，onslopestability.However， a comprehensive research framework for water prevention and control schemes under the combined influence of residual water in surounding rock and groundwater recharge has notyet been established.To address this issue， taking an open-pit mine in the Thar Coalfield of Pakistan as the research background，a treatment scheme involving the reconstruction of the sand cushion layer at the base of the inner dump was proposed.The sand cushion in the inner dump was reconstructed intoa four-layer structural systemcomposed of waste material，sand cushion，impervious layer，andthethirdaquifer.TheSEEP/Wseepage modeland theSLOPE/Wstabilitymodel were established using GeoStudio software.The variations in seepage field and slope stabilityof the inner dump were comparedand analyzed under conditions of diferent thicknesses and permeability coeffcients of the reconstructed sand cushion.The results showed that increasing the permeabilitycoeficient and thickness of the sand cushion could efectively lower the groundwater level in the inner dump and improve the overall slope stability. A reconstructed sand cushion with a thickness of 11.5m and a permeability coeficient of 23.8m3/d or one with a thickness of 5.2m and a permeability coefficient of 47.6m3/d ，enabled the slope stability coefficient to meet the required safety reserve factor.

Key words： open-pit mine; inner dumps; reconstructed sand cushion; slope stability; seepage field

0引言

内排土场是矿山开采过程中形成的大型人工松散堆积体，主要用于集中堆置排弃物，其稳定性对矿山安全生产和经济效益具有重要影响[1-2]。（剩余15520字）