加筋保土柔性污染阻隔管控技术在历史遗留废渣堆治理中的应用

Application of Reinforcement and Soil Protection Flexible Pollution Barrier and Control Technology in the Treatment of Historical Legacy Waste Dumps

历史遗留废渣堆的治理是目前环保治理工作中的难点和热点,特别是对于堆存场地受限、边坡陡的废渣堆,原位污染防控与生态恢复的协同治理技术是当下历史遗留废渣堆污染防治的难题之一。以某关停矿山生态恢复项目渣堆管控项目为例,提出了一种新型的历史遗留废渣堆原位污染防控及生态恢复技术,即废渣堆加筋—保土—水平与垂直柔性阻隔—生态恢复治理方案,简称“加筋保土柔性阻隔生态恢复技术”,该技术对废渣堆采用土工袋+格栅加筋的方式稳固边坡,堆体表面设置HDPE膜为主防渗的阻隔层,并挂设土工格室进行保土绿化,并在渣堆四周设置柔性垂直污染防控阻隔墙,将废渣堆进行三维立体阻隔,有效防控废渣堆对周边地下水及土壤的污染。同时废渣堆表层阻隔采用的是HDPE膜,其渗透系数小于1×10^(-13) cm/s,四周采用的柔性垂直阻隔墙整体渗透系数小于1×10^(-7) cm/s,HDPE膜表层通过钢制花管HDPE管靴固定土工格室,钢制花管HDPE管靴可与HDPE膜实现热熔焊接,渗透系数满足1×10^(-7) cm/s,最终实现污染阻隔与生态绿化相互协同,达到废渣堆原位污染防控和生态恢复的双重效果。

The treatment of historical waste piles is a difficult and hot topic in environmental protection management workcurrently,especially for waste piles with limited storage sites and steep slopes,the collaborative governance technology of in-situ pollution prevention and ecological restoration is one of the challenges in preventing and controlling pollution from historical legacy waste piles.Taking the slag pile control project of a closed mine ecological restoration project as an example,a new type of in-situ pollution prevention and ecological restoration technology for historical legacy waste piles has been proposed,so-called reinforcement of waste residue pile-soil protection-horizontal and vertical flexible barriers-ecological restoration and management plan,abbreviated as“Reinforced Soil Protection Flexible Barrier Ecological Restoration Technology”.This technology uses geotextile bags and grid reinforcement to stabilize the slope of the waste residue pile.HDPE film is set as the main anti-seepage barrier layer on the surface of the pile,and geotextile chambers are hung for soil protection and greening.Flexible vertical pollution prevention and control barriers are set up around the waste residue pile to effectively prevent and control the pollution of the waste residue pile to surrounding groundwater and soil in a three-dimensional vertical manner.Meanwhile,the surface barrier of the waste heap is made of HDPE film,with a permeability coefficient less than 1×10^(-13) cm/s,the overall permeability coefficient of the flexible vertical barrier walls used around is less than 1×10^(-7) cm/s,the ultimate goal is to achieve the synergy between pollution prevention and ecological greening,achieving a dual effect of in-situ pollution control and ecological restoration of waste residue piles.