Hazardous Waste Landfill Cap System Stability

by Nenad Duplancic, Int Technology Corp, Martinez, CA, USA,
Umesh Dayal, Int Technology Corp, Martinez, CA, USA,
James C. Colella, Int Technology Corp, Martinez, CA, USA,

Document Type: Proceeding Paper

Part of: Geotechnical Practice for Waste Disposal '87


Pursuant to the regulatory requirements for control of rainfall infiltration into a hazardous waste landfill, a cap design that is impervious plus stable is required. The intent of a cap system is to provide (1) an infiltration barrier which reduces the potential for continued leachate production after closure of the facility and (2) an optimal slope which is stabile. The proposed cap system consists of a three-foot-thick cover vegetation zone, filter cloth, synthetic drainage net, synthetic membrane, and a clay layer; all of which are above the hazardous waste. The stability of the proposed system is analyzed to evaluate failure. The stability analysis was performed using a computerized version of the sliding block-type and deep-seated circular failure surfaces. Stability of the drainage net was also considered and the design recommendations have been generated for spot welding and anchoring.

Subject Headings: Hazardous wastes | Landfills | Failure analysis | System analysis | Hazardous materials | Hydraulic design | Waste disposal | Material failures

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