Location

St. Louis, Missouri

Session Start Date

6-1-1993

Abstract

A determination of the phreatic surface in dams constructed of coal refuse, under the criteria set forth in the National Dam Safety Act was made. All of these dams were over 20 years old. Most of the embankments studied were not constructed with any compaction specification and no effort was made to compact the coal refuse. A comparison of actual phreatic surface to the theoretically predicted surface is made using the classical seepage theory and the computer program SEEP. The embankments are old enough to present the steady slope phreatic surface, and thus, provide a good check of the ability of current methods to predict the actual phreatic surface. It was found that the fine refuse deposited in the reservoir acts as an upstream "impermeable" blanket and the phreatic surface remains relatively low. By back calculations, it was determined that the permeability anisotrophy ratio is between 1.1 and 4.2 in uncompacted coal refuse dams.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Third Conference

Publisher

University of Missouri--Rolla

Publication Date

6-1-1993

Document Version

Final Version

Rights

© 1993 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Jun 1st, 12:00 AM

Seepage Through Mine Tailings Dams

St. Louis, Missouri

A determination of the phreatic surface in dams constructed of coal refuse, under the criteria set forth in the National Dam Safety Act was made. All of these dams were over 20 years old. Most of the embankments studied were not constructed with any compaction specification and no effort was made to compact the coal refuse. A comparison of actual phreatic surface to the theoretically predicted surface is made using the classical seepage theory and the computer program SEEP. The embankments are old enough to present the steady slope phreatic surface, and thus, provide a good check of the ability of current methods to predict the actual phreatic surface. It was found that the fine refuse deposited in the reservoir acts as an upstream "impermeable" blanket and the phreatic surface remains relatively low. By back calculations, it was determined that the permeability anisotrophy ratio is between 1.1 and 4.2 in uncompacted coal refuse dams.