Weak rocks encountered in open pit mines cover a wide variety of
materials, with properties ranging between soil and rock. As such,
they can provide a significant challenge for the slope designer.
For these materials, the mass strength can be the primary control
in the design of the pit slopes, although structures can also play
an important role. Because of the typically weak nature of the
materials, groundwater and surface water can also have a
controlling influence on stability. Guidelines for Open Pit Slope
Design in Weak Rocks is a companion to Guidelines for Open Pit
Slope Design, which was published in 2009 and dealt primarily with
strong rocks. Both books were commissioned under the Large Open Pit
(LOP) project, which is sponsored by major mining companies. These
books provide summaries of the current state of practice for the
design, implementation and assessment of slopes in open pits, with
a view to meeting the requirements of safety, as well as the
recovery of anticipated ore reserves. This book, which follows the
general cycle of the slope design process for open pits, contains
12 chapters. These chapters were compiled and written by industry
experts and contain a large number of case histories. The initial
chapters address field data collection, the critical aspects of
determining the strength of weak rocks, the role of groundwater in
weak rock slope stability and slope design considerations, which
can differ somewhat from those applied to strong rock. The
subsequent chapters address the principal weak rock types that are
encountered in open pit mines, including cemented colluvial
sediments, weak sedimentary mudstone rocks, soft coals and chalk,
weak limestone, saprolite, soft iron ores and other leached rocks,
and hydrothermally altered rocks. A final chapter deals with design
implementation aspects, including mine planning, design
implementation, monitoring, surface water control and closure of
weak rock slopes. Key Features: Illustration of the best practice
in modern open pit mines State of the art approaches for
challenging designs Use of numerous case histories written by
large-open pit operators to illustrate state of practice Individual
chapters/sections written by leaders in the industry As with the
other books in this series, Guidelines for Open Pit Slope Design in
Weak Rocks provides guidance to practitioners involved in the
design and implementation of open pit slopes, particularly
geotechnical engineers, mining engineers, geologists and other
personnel working at operating mines.
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