Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

The practice of "approximate original contour" in the central Appalachians. I. Slope stability and erosion potential.

Authors
Bell-JC; Daniels-WL; Zipper-CE
Source
Landsc Urban Plan 1989 Dec; 18(2):127-138
NIOSHTIC No.
10008389
Abstract
Surface mining for coal had disturbed hundreds of thousands of acres in the Appalachians by the mid-1970's. The mined landscape created by typical "shoot-and-shove" mining methods during this era led to severe water-quality and land-use problems. Enacted in 1977, the Surface Mining Control and Reclamation Act (SMCRA) required that all mining spoil be stabilized and returned to "approximate original contour" (aoc) wherever possible. This requirement is controversial in the steeply sloping Appalachian mining region. The major goal of this research was to objectively evaluate the long-term slope stability and potential erosivity of central Appalachian aoc landforms. Many aoc backfills in this region face long-term stability problems. The major factors leading to backfill instability are (1) excessively steep and/or convex fill configurations, (2) excessive seepage leading to loss of fill strength, and (3) inaccurate estimation of spoil shear strength parameters and fill safety factors. Slope failures may occur both within and beyond the 5-yr bond release period mandated by SMCRA. Steeply sloping siltstone spoils are particularly prone to erosion losses, and rapid revegetation is essential for the stabilization of aoc slopes. Widespread implementation of alternative landforms that utilize hollow fills for excess spoil disposal while still eliminating the highwall would greatly reduce the potential for slope failures and erosion by reducing total backfill slope areas and lengths.
CODEN
LUPLEZ
Publication Date
19890101
Document Type
OP; Final Contract Report; Journal Article
Fiscal Year
1989
NTIS Accession No.
NTIS Price
Identifying No.
MIR 25-90
Issue of Publication
2
ISSN
0169-2046
Source Name
Landscape and Urban Planning
State
VA
Performing Organization
Virginia Polytechnic Inst & St Univ
TOP