Effective Stress Principle For Partially Saturated Rock Fractures
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The scale of the fractures can vary, making the seismic velocity and anisotropy substantially scale dependent. Previous studies10, 11, 12, 21 discussed the applicability of Biot’s effective . 李毅， 1988 年生，教授，博士生导师，长沙理工大学水利与环境工程学院副院长，湖南省青年骨干教师培养对象， 中国工程教育认证协会秘书 ， 入选湖南省科技人才托举工程、湖南省“三尖”创新人才工程。This work explains how capillary forces affect the strength and deformation of rock that is partially-saturated with two immiscible fluids. Bertels SP, Dicarlo DA, Blunt MJ (2001) Measurement of aperture distribution, capillary pressure, relative permeability, and in situ saturation in a rock fracture using computed tomography scanning. This fluid usually is the pore liquid. Laboratory Study of Effective Stress Coefficient for Saturated Claystone.Regarding a fully saturated porous material, only one single fluid fills the pore space.Schlagwörter:Effective Stress CoefficientStress On RocksPublish Year:2020
Effective Stress Principle for Partially
Since cave mining offers substantial benefits, .
Effective Stress Principle for Partially Saturated Rock Fractures
For a partially saturated rock, the void space volume V a is taken into account in the following way.Effective stress coefficient a ij increases with fracture growth, even beyond unity.4370530 Corpus ID: 257211917; A New Model for Evaluating Rock Drillability Considering the Rock Plasticity and Chip Hold Down Effect Caused by Hydrostatic Column Pressure Under High Confining Pressure
Shear Behavior and Properties of Granite Fractures Under
Δσ’, Δσ, and Δu are the changes in effective stress, total stress, and pore water pressure, respectively, and α is a coefficient describing the efficiency of pore water pressure in opposing the applied stresses. Based on the measured effective stress coefficients of rock fractures subjected to varying normal stresses and water pressures . Based on discrete element models, bulk modulus method . As the strain depends on the effective state of stress variation, the derived stress–strain equations include the coefficient of earth .In the present paper, we investigate how water acts to weaken rock in two complementary ways: mechanically through the generalized effective stress principle, and chemically through time-dependent rock-fluid reactions that allow subcritical crack growth.Equation () can be regarded as a calculation formula for the effective stress coefficient (α), which overcomes the measurement difficulties when using the definition formulas of Eqs.Sustainable ore extraction in cave mining heavily relies on the effective fragmentation or caveability of the orebody. Actually, the situation is a bit more intricate as the effective . Using the fracture mechanics approach applied to a .Geosciences ˙ = (˙ (˙ (˙ (˙ . A series of direct shear tests were conducted on granite fractures covering various reservoir impoundment-relevant pore water pressures.Request PDF | Effective Stress Principle for Partially Saturated Rock Fractures | IntroductionSoils and rocks are commonly characterized as a porous or .Schlagwörter:Effective Stress CoefficientPublish Year:2021Crack stress thresholds in rocks have long been a popular subject in rock mechanics and engineering research.An effective stress principle for saturated fractured porous media is proposed based on the double-porosity representation.Section snippets Equivalent effective stress model for rocks with a single fracture. 2023, 13, 10592 2 of 14 where h is the effective stress coefficient of a geomaterial.Schlagwörter:Effective Stress CoefficientStress On Rocks
2D Phase-Field Modelling of Hydraulic Fracturing Affected by
Previous studies10, 11, 12, 21 discussed the applicability of Biot’s effective stress model in describing the response of porous materials to external stresses and internal pore pressures, which can be expressed as: d ε = 1 K (d σ − α d p) where K is the usual . The aperture distribution of the . Yavuz Corapcioglu 4 presents the variation of fracture normal displacement with normal stress based on the experimental results in Xu and Xie.Schlagwörter:Publish Year:2020Earth ScienceCited By:11adshelp[at]cfa. As can be seen in Fig. Bertels SP, Dicarlo DA, Blunt MJ (2001) Measurement of aperture distribution, capillary pressure, relative permeability, and in situ saturation in a rock .Citation: Li, F.Schlagwörter:Publish Year:2016The Effective Stress Principle In this study, the applicability of existing methods .The applicability of the classic Terzaghi or Biot effective stress laws to fractured rocks is not clear. In this study, the phase-field method is further developed to be employed for modelling the HF propagation and the evolution .
Effects of Notches on Breakdown Pressures and Fracture
33 The difference of the .This paper describes a methodology for the measurement of the capillary pressure curve of dense nonaqueous phase liquids (DNAPLs) in a water-saturated sandstone induced fracture.Geschätzte Lesezeit: 10 min
Effective Stress Principle for Partially Saturated Rock Fractures
Soils and rocks are commonly characterized as a porous or fractured medium, with liquid and gaseous fluids occupying and moving in the void space.The interaction between a propagating hydraulic fracture (HF) and a pre-existing natural fracture (NF) embedded in saturated poroelastic rock formations is studied numerically in 2D plane–strain configurations.The effective stress initially presented by Terzaghi [23], has been widely used to describe the deformation behaviors of poroelastic media to the total stress and . In this case, the liquid saturation s L reduces to one, and the pressure-difference-saturation condition becomes unnecessary. One aspect of that .Schlagwörter:The Effective Stress PrincipleKagan Tuncay, M.Schlagwörter:Effective Stress CoefficientStress On RocksPublish Year:2021
Predicting the behavior of a saturated rock with variations in pore fluid pressure during geo-energy production and storage, deep geological disposal of nuclear wastes, etc. In this work, systematic .Request PDF | Wetting collapse analysis on partially saturated oil chalks by a modified cam clay model based on effective stress | This paper presents an interpretation of wetting collapse in . Moreover, the governing equations simplify, such that the gas balances of mass and . The presence of water in .2 Numerical Upscaling Procedure. Saturated rock masses with two distinct scales of porosity are widely distributed in nature, and play a crucial role in engineering fields such as carbon dioxide sequestration, 1 geothermal energy development, 2 oil extraction, 3 etc. Department of Energy’s Office of Scientific and Technical InformationWhen the void is completely closed again, the rock is treated as a .Schlagwörter:Benjamin LoretPublish Year:2019Benjamin.The effective stress principle, proposed by Karl von Terzaghi in the first half of the twentieth century, is the basis for understanding the mechanical behavior of saturated porous materials .Hydraulic fracturing technology has been widely used in the tight reservoir reconstruction.Fachinformationsdienst BAUdigital A platform for research: civil engineering, architecture and urbanism The grid-like distributed and low-order pores formed during the rock formation occupy the primary .Schlagwörter:Effective Stress CoefficientStress On RocksPublish Year:2020
Both the solid grains and the fractured porous [email protected] effective stress principle (ESP) plays a basic role in geology and engineering problems as it is involved in fundamental issues concerning strain and failure of rock and soil, as well as of other porous materials such as concrete, metal powders, biological tissues, etc.
Although since its introduction in the 1920s the main ESP aspects .In order to study the damage properties of red sandstone under combined action of temperature, water and stress, the uniaxial compression test was carried out . In the case of compression, the void space decreases progressively with crushing of the rock without taking account of the water remaining at zero pressure (Fig. a 1 is the largest, and a 3 > a 2.
a ij and E ij exhibit anisotropy with loading. Unfortunately, with the deepening of mining depth and the increase of geo-stress, the propagation mechanism of medium-pressure fractures in the reservoir is significantly different from that of conventional shallow reservoirs. 2 (a), the fluid pressures decline in the formation in the region where production has occurred and with time the pressure transient moves further.Saturated rock masses with two distinct scales of porosity are widely distributed in nature, and play a crucial role in engineering fields such as carbon dioxide sequestration, 1 geothermal energy development, 2 oil extraction, 3 etc. Two methods are given to determine the effective stress coefficient of saturated fractured rocks.
A thorough laboratory investigation of mechanical and flow behaviors is crucial for understanding the complex response of coalbeds to CO2 injection-enhanced coalbed methane recovery (CO2-ECBM) operation.
A quantitative and analytical approach is adopted to estimate two important parameters for coupled hydro-mechanical analysis at the scale of a fractured rock mass, namely the equivalent Biot .edu The ADS is operated by the Smithsonian Astrophysical Observatory under NASA Cooperative Agreement NNX16AC86ASchlagwörter:Publish Year:2016Y. The water saturation front also moves further .This principle works also with dilating shear bands arising beyond critical points of saturated grain fabrics, and with . Two mechanisms of the scale-dependent phenomenon may be considered: scattering and .
Details of specimen preparation, capillary barrier design, and capillary pressure measurement setup, procedure, and results are given. is carried out using .Geological sequestration of CO2 in coal seams is of significant interest to both academia and industry.Understanding and predicting the shear mechanical characteristics of rock fractures subjected to different pore water pressures is vital for the safety and the stability of the reservoir bank slope. In order to obtain the seismic response, we locally solve Equations 1-4 for a representative elementary volume (REV) of the formation of interest by means of a .Explore millions of resources from scholarly journals, books, newspapers, videos and more, on the ProQuest Platform.3 An Effective Stress Principle for Smooth Parallel Fractures
Effective Stress Principle for Partially Saturated Rock Fractures
Actually, the situation is a bit more intricate as the effective stress \(\overline{ {\varvec{\sigma }}}\) that is involved in the elastic relations, termed Biot’s stress, is not exactly the same as the effective stress \( {\varvec{\sigma }}’\) that drives the .While Terzaghi justified his principle of effective stress for water-saturated soil empirically, it can be derived by means of the neutrality of the mineral with respect to changes of the pore water pressure \(p_w\). The first method, named bulk .The effective stress coefficient is critical to accurately predict the hydromechanical coupling behavior of single water-bearing rock fractures.Fachinformationsdienst BAUdigital Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik103564 Corpus ID: 216259043; On the effective stress coefficient of saturated fractured rocks @article{Chen2020OnTE, title={On the .
Since Biot [3] modified the effective stress principle, numerous studies have inves-tigated it in . 所在学科：水利工程（水利水电工程、水工结构工程）
Effective stress principle for partially saturated media
Section snippets Methodology.Based on the results of recent studies, comprehensive characterization of the behavior of infilled rock fractures under saturated and unsaturated conditions requires knowledge of morphological .The stress that drives the strain in fluid-saturated porous media is referred to as the effective stress.@article{osti_59526, title = {Effective stress principle for partially saturated media}, author = {McTigue, D F and Wilson, R K and Nunziato, J W}, abstractNote = {In support of the Nevada Nuclear Waste Storage Investigation (NNWSI) Project, we have undertaken a fundamental study of water migration in partially saturated media.Schlagwörter:Effective Stress CoefficientCubic Sandstone SpecimensSchlagwörter:The Effective Stress PrinciplePublish Year:2021Firstly, the results for water-gas fracture pressures and water saturation profiles in the fracture network are presented.The effective stress principle (ESP) plays a basic role in geology and engineering problems as it is involved in fundamental issues concerning strain and .
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