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Estimating Horizontal Drain Design by the Finite-element and Finite- difference Methods.

Tesarik-DR; Kealy-CD
MISSING :26 pages
To ensure the stability of a tailings pond embankment, the height of the phreatic surface must be kept at or below a safe level. In this investigation, the Bureau of Mines analyzed various horizontal drain designs for tailings embankments to determine their effects on location of the phreatic surface. This report describes the investigation, and it includes 21 dimensionless graphs that can be used to estimate the drain spacing and length dimensions necessary to ensure the stability of embankments of various configurations. Analyses were based on the use of two computer codes, a three- dimensional finite-element code and a two-dimensional finite- difference code. Nearly the same phreatic surface locations were predicted using either of the computer codes. For one of the actual embankments studied, the predicted phreatic surface location was slightly higher than the measured location; for the other, the predicted location closely followed the actual surface trend. Phreatic surfaces of the laboratory model were slightly higher than the code-generated locations, and the differences grew larger as drain length increased or drain spacing decreased.
Publication Date
Document Type
IH; Report of Investigations
Fiscal Year
Identifying No.
RI 8875
NIOSH Division
Source Name
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division