标题1：Numerical modeling of hydraulic fracture initiation and development
期刊 Journal of Mining Science
出版社 Springer New York
ISSN 1062-7391 (Print) 1573-8736 (Online)
期 Volume 43, Number 1 / 2007年1月
文章类型 Rock Failure
DOI 10.1007/s10913-007-0006-6
页 40-56
Subject Collection 地球和环境科学
SpringerLink Date 2007年6月11日
Abstract ： Studying initiation and propagation of hydraulic fractures is carried out based on the hypersingular boundary element method.
标题2：Geomechanical model for fracture deformation under hydraulic, mechanical and thermal loads
期刊 Hydrogeology Journal
出版社 Springer Berlin / Heidelberg
ISSN 1431-2174 (Print) 1435-0157 (Online)
期 Volume 14, Number 4 / 2006年4月
文章类型 Paper
DOI 10.1007/s10040-005-0455-4
页 485-498
Subject Collection 地球和环境科学
SpringerLink Date 2005年9月8日
Abstract ：
Hydraulic flow and transport (heat and solute) within crystalline rocks is dominated by the fracture systems found within them. In situ stress conditions have a significant impact on the hydraulic, mechanical and thermal coupled processes, and quantification of these processes provides a key to understanding the often transient time-dependent behaviour of crystalline rocks. In this paper, a geomechanical model is presented which describes fracture closure as a function of effective stress and the changes in parameters such as storage, permeability, porosity and aperture. Allowing the fracture closure to be defined by the change in normal effective stress provides a link to the numerical consideration of parametrical changes due to rock stress alterations caused for example by changes in fracture fluid pressure, stress release, tectonic stress, thermal stress, orientation of the natural fracture in the pervasive stress system and local changes in a rock mass due to stress alteration. The model uses geometrical considerations based on a fractal distribution of apertures on the fracture surface, and applies well-established analytical elastic deformation solutions to calculate the deformation response to changes in effective stress. Analysis of the fractal generation method allows a standard normal distribution of fracture apertures to be predicted for all common fractal dimensions relating to a 2D surface. Changes in the fracture aperture are related to hydraulic functions such as permeability, storage and porosity of the fracture. The geomechanical model is experimentally validated against laboratory scale experimental data gained from the closure of a fractured sample recovered at a depth of 3,800 m from the KTB pilot borehole. Parameters for matching the experimental data were established externally, the only fitting parameters applied were the minimum and maximum contact area between the surfaces and the number of allowable contacts. The model provides an insight into the key processes determining the closure of a fracture, and can act as a material input function for numerical models linking the effects of changes in the stress field, hydraulic or thermal conditions, to the flow and transport parameters of a fractured system.
标题3：Experimental and modelled mechanical behaviour of a rock fracture under normal stress
作者：A. Marache , J. Riss and S. Gentier
相关信息：
期刊 Rock Mechanics and Rock Engineering
出版社 Springer Wien
ISSN 0723-2632 (Print) 1434-453X (Online)
DOI 10.1007/s00603-008-0166-y
Subject Collection 地球和环境科学
SpringerLink Date 2008年4月1日
https://commerce.metapress.com/content/r60hm47655538577/resource-secured/?target=fulltext.pdf&sid=2xs1ci45zf33h4etaqtbw4jm&sh=www.springerlink.comSummary：
The mechanical and hydromechanical behaviour of isolated rock joints is of prime importance for a correct understanding of the behaviour of jointed rock masses. This paper focuses on the mechanical behaviour of a fracture under normal stress (fracture closure), using approaches based on both experimentation and modelled analysis. Experimental closure tests were carried out by positioning four displacement transducers around a fracture, leading to results which tended to vary as a function of transducer location. Such variations can be explained by the non-constant void space distribution between both walls of the fracture. The present study focuses on the importance of transducer location in such a test, and on the significant role played, in terms of mechanical response, by the morphology of the fracture surfaces.
An analytical mechanical model is then developed, which takes into account the deformation of surface asperities and of the bulk material surrounding the fracture; it also includes the effects of mechanical interaction between contact points. The model is validated by simulating the behaviour which is very similar to experimental observations. Various parametric studies (scale effect, spatial distribution of contact points) are then carried out. The study of scale effects reveals a decrease in the normal stiffness with increasing fracture size. Finally, analysis of the role of various mechanical parameters has shown that the most influential of these is Young’s modulus corresponding to the bulk material surrounding the joint. Many applications, such as geothermal fluid recovery from fractures, could benefit from these results.
Keywords: Fracture, mechanical behaviour, normal stress, experimental device, roughness, analytical model, parametric study
Correspondence: Antoine Marache, Université Bordeaux 1, GHYMAC, Av. des Facultés, 33405 Talence Cedex, France
[ 此贴被rendelu在2008-04-29 12:31重新编辑 ]
