关键词: 生活垃圾填埋场')">

生活垃圾填埋场, 断裂破碎带, 垂直阻隔, 自凝灰浆-HDPE土工复合防渗墙, 梯度防渗屏障系统

Abstract:

To mitigate groundwater contamination risks caused by leachate leakage from aging domestic waste landfills in heterogeneous composite permeable strata, this study focuses on the vertical barrier engineering practice implemented downstream of the Hangzhou Tianziling Landfill as a representative case. Under the mechanical-hydraulic coupling of the fault zone and permeable strata, a multi-tiered gradient barrier system was developed through the integration of curtain grouting, chemical grouting, and a self-setting mortar-HDPE composite cutoff wall. In areas characterized by well-developed fault fracture zones and permeable gravel layers, a dual-process system (curtain grouting combined with chemical grouting) was implemented to construct a multi-functional cutoff curtain. For moderately weathered rock strata, an integrated barrier system was developed, combining the deformability of self-setting mortar with the impermeability of HDPE geomembrane. The innovative integration of construction processes and field implementation techniques enables continuous interfacial bonding of impermeable barriers across heterogeneous geological units. This systemic approach facilitates a paradigm shift from reactive contamination remediation to proactive risk governance, achieving precise blocking of the leachate migration path and spatial control of groundwater pollution.

Key words:  ')">

 , Domestic waste landfill, Fault-associated fracture zone, Vertical cutoff curtain, Self-setting mortar-HDPE geosynthetic composite cutoff wall,  , Gradient anti-seepage barrier system