Hydraulic, Water Engineering
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Hydraulic Fracturing In Earth - Rock Fill Dam
Jun - Jie Wang (Autor)
·
Wiley
· Cloth
Hydraulic Fracturing In Earth - Rock Fill Dam - Jun - Jie Wang
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Reseña del libro "Hydraulic Fracturing In Earth - Rock Fill Dam"
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 Analyzing 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 Youngs Modulus, The Poissons 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 Analyze The Ability Of Earth - Rock Fill Dam To Resist Hydraulic Fracturing, The Nuozhadu Dam Located In Western China Is Analyzed
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