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Hydraulic Fracturing In Earth-Rock Fill Dam (Cód: 9396538)

Wang, Jun-Jie

John Wiley & Sons

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Descrição

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. In several unsolved problems on the safety of earth-rock fill dams, the problem of hydraulic fracturing in the soil core is one that receives a lot of attention from designers and researchers. Hydraulic fracturing is generally considered to be a key cause of dam leakage during first filling. In this extensive book, the conditions, mechanisms and criteria for hydraulic fracturing are investigated, and a new numerical simulation 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 the virtual crack extension method. The book: Presents a systematic and comprehensive study of hydraulic fracturing, original in its concentration on core soil problems Focuses on the problem of hydraulic fracturing in earth-rock fill dams Examines advanced laboratory soil testing, application of numerical methods and field testing/monitoring Provides an essential reference in an area of scarce research in this field: the need for this in high level earth dam construction in developing countries is pressing This book is essential reading for researchers and postgraduate students in hydraulic and geotechnical engineering fields. Designers and constructors in hydraulic and geotechnicalengineering will also fi nd it helpful.

Características

Peso 0.59 Kg
Produto sob encomenda Sim
Marca John Wiley & Sons
I.S.B.N. 9781118725504
Referência 026433825
Altura 24.38 cm
Largura 17.27 cm
Profundidade 1.78 cm
Idioma Inglês
Acabamento Capa dura
Cód. Barras 9781118725504
Ano da edição 2014
AutorWang, Jun-Jie