Hydraulic Fracturing in Earth-rock Fill Dams
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Form:Einzelkauf Download
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Sprache:Englisch
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eBook Format:PDF
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Produktdetails
Format
Kopierschutz
Ja
Family Sharing
Nein
Text-to-Speech
Nein
Erscheinungsdatum
11.04.2014
Verlag
John Wiley & SonsSeitenzahl
280 (Printausgabe)
Dateigröße
13244 KB
Auflage
1. Auflage
Sprache
Englisch
EAN
9781118725559
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.
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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