土-膨润土垂直防渗墙在某危废填埋场应急阻隔中的应用

Application of soil-bentonite vertical cutoff wall in a hazardous waste landfill

针对危险废物填埋场泄露问题,首次采用土-膨润土垂直防渗墙对危废填埋场进行阻隔修复。选用产自寿光的粉砂和钠基膨润土,制备防渗材料。通过配比实验,膨润土配比超过14%时,防渗材料渗透系数小于1×10-7 cm/s,满足防渗要求。施工过程中,针对场地地质结构,采用旋挖套打开槽和旋挖-冲击钻开槽两种技术,解决了基岩地区不易开挖的难题。最终通过地下水水质监测,证明阻隔效果有效,表明土-膨润土垂直防渗墙技术可应用于危险废物填埋场阻隔修复,可为类似工程提供参考。

The soil-bentonite vertical cutoff wall was used to block the leakage of hazardous waste landfill for the first time.By using floury soil from Shouguang and sodium bentonite as material,the ratio of floury soil and bentonite was confirmed to be 86∶14 by experiment.The permeability coefficient of anti-seepage material is less than 1×10-7 cm/s.In construction,rotating drill and impact drill were proposed to excavate the bedrock below ground.The result indicated that the soil-bentonite vertical cutoff wall is efficient and effective in hazardous waste landfill remediation.