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Books > Earth & environment > Earth sciences > The hydrosphere
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Hydraulic Fracturing in Earth-rock Fill Dam (Hardcover)
Loot Price: R4,754
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Hydraulic Fracturing in Earth-rock Fill Dam (Hardcover)
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Presents a systematic and comprehensive study of hydraulic
fracturing, original in its concentration of core soil problems
There have been a number of well-studied cases in which dams have
failed or been damaged by concentrated leaks for no apparent cause.
In some of these experiences, investigators concluded that
differential settlement cracks were the probable causes, even
though no cracks were seen on the surface. In these examples, it
was not determined whether the crack was open before the reservoir
filled or whether it might have opened afterward. In several
unsolved problems on the safety of the earth-rock fill dam, the
problem of hydraulic fracture in the soil core of the earth-rock
fill dam is one that is widely paid attention by designers and
researchers. Hydraulic fracturing is generally considered as a key
cause which may induce the leakage of the dam during first filling.
In this extensive book, a new numerical simulate method is
suggested. The method is based on the conventional two-dimensional
finite element technique, and the theoretical formulations to
calculate energy release rate using virtual crack extension method.
The influence factors on convergence of calculated J integral are
investigated. The accuracy of the calculated J integral is verified
by analysing the three typical problems in Fracture Mechanics, in
which propagation of crack may follow mode I, mode II and mixed
mode I-II respectively. Using the new numerical method, the factors
affecting the occurrence of hydraulic fracturing in the earth-rock
fill dam are investigated. The investigating results indicate that
increasing any of the Young s modulus, the Poisson s ratio and the
density of the core soil is helpful to reduce the likelihood of the
occurrence of hydraulic fracturing. The likelihood of the
occurrence of hydraulic fracturing increases with increasing the
water level or the crack depth. The lower part of the dam core is
the zone in which the phenomenon of hydraulic fracturing may be
induced easily. As an example to analyse the ability of earth-rock
fill dam to resist hydraulic fracturing, the Nuozhadu Dam located
in Western China is analysed. * Presents a systematic and
comprehensive study of hydraulic fracturing, original in its
concentration of core soil problems * Focuses on the problem of
hydraulic fracturing in earth-rock fill dams from three aspects;
conditions and mechanisms of hydraulic fracturing, criterion of
hydraulic fracturing, and numerical method on hydraulic fracturing
* Examines advanced laboratory soil testing, application of
numerical methods and field testing/monitoring, all needed for a
better understanding of hydraulic fracturing in earth/rock fill
dams * Provides an essential reference in an area of scarce
research in this field, and the need in high earth dam construction
in developing countries is pressing Ideal for researchers in
Hydraulic and Geotechnical Engineering Fields; Students on Masters
or PhD courses; as well as Designers and Constructors in Hydraulic
and Geotechnical Engineering Fields.
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