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Anisotropic time-dependent behaviors of shale under direct shearing and associated empirical creep models

Journal of Rock Mechanics and Geotechnical Engineering 2024年第4期16卷 1262-1279页

作者： Yachen Xie Michael Z.Hou hejuan liu Cunbao Li Shenzhen Key Laboratory of Deep Engineering Sciences and Green Energy Shenzhen UniversityShenzhen518060China Institute of Subsurface Energy Systems Clausthal University of TechnologyClausthal-Zellerfeld38678Germany State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China

Understanding the anisotropic creep behaviors of shale under direct shearing is a challenging *** this context,we conducted shear-creep and steady-creep tests on shale with five bedding orientations (i.e.0°,30°,45°,60°,and 90°),under multiple levels of direct shearing for the first *** results show that the anisotropic creep of shale exhibits a significant stress-dependent *** a low shear stress,the creep compliance of shale increases linearly with the logarithm of time at all bedding orientations,and the increase depends on the bedding orientation and creep *** high shear stress conditions,the creep compliance of shale is minimal when the bedding orientation is 0°,and the steady-creep rate of shale increases significantly with increasing bedding orientations of 30°,45°,60°,and 90°.The stress-strain values corresponding to the inception of the accelerated creep stage show an increasing and then decreasing trend with the bedding orientation.A semilogarithmic model that could reflect the stress dependence of the steady-creep rate while considering the hardening and damage process is *** model minimizes the deviation of the calculated steady-state creep rate from the observed value and reveals the behavior of the bedding orientation's influence on the steady-creep *** applicability of the five classical empirical creep models is quantitatively *** shows that the logarithmic model can well explain the experimental creep strain and creep rate,and it can accurately predict long-term shear creep *** on an improved logarithmic model,the variations in creep parameters with shear stress and bedding orientations are *** abovementioned findings,a mathematical method for constructing an anisotropic shear creep model of shale is proposed,which can characterize the nonlinear dependence of the anisotropic shear creep behavior of shale on the bedding orientation.

关键词： Rock anisotropy Direct shear creep Creep compliance Steady-creep rate Empirical model Creep constitutive model

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Numerical modeling of thermal breakthrough induced by geothermal production in fractured granite

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Journal of Rock Mechanics and Geotechnical Engineering 2020年第4期12卷 900-916页

作者： hejuan liu Hongwei Wang Hongwu Lei Liwei Zhang Mingxing Bai Lei Zhou State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China University of Chinese Academy of Sciences Beijing100049China College of Energy Chengdu University of TechnologyChengdu610059China Department of Petroleum Engineering Northeast Petroleum UniversityDaqing163318China State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing400030China

It is well known that the complicated channeling of fluid flow and heat transfer is strongly related with the intricate natural fracture ***,it is still challenging to set up the fracture network model which is strong *** with other methods(*** continuum model(ECM),discrete fracture model(DFM),and ECM-DFM),the fracture flow module in the COMSOL Multiphysics simulator is powerful in definition of fractures as the inner flow boundary existing in the porous *** it is selected to simulate the fluid flow and heat transfer in the geothermal-developed fractured granite of Sanguliu area located at Liaodong Peninsula,Eastern *** natural faults/fractures based on field investigation combined with the discrete fracture network(DFN)generated by the MATLAB are used to represent the two-dimensional geological *** results show that early thermal breakthrough occurs at the production well caused by quick flow of cold water along the highly connected *** hydraulic fracturing treatments with proper injection rates,locations,*** efficiently hinder the thermal breakthrough time in the natural fracture *** well spacing helps the long-term operation of geothermal production,but it is highly dependent on the geometrical morphology of the fracture *** enhancement of reservoir properties at the near-well regions can also increase the geothermal production *** results in this study can provide references to achieve a sustainable geothermal exploitation in fractured granitic geothermal reservoirs or hot dry rocks at depth.

关键词： Thermal breakthrough Discrete fracture network(DFN) Monte Carlo method Fracture aperture Granite

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Clogging caused by coupled grain migration and compaction effect during groundwater recharge for unconsolidated sandstone reservoir in groundwater-source heat pump

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第8期16卷 2947-2959页

作者： Fujian Yang Jing Luo Guiling Wang hejuan liu Dawei Hu Hui Zhou State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China University of Chinese Academy of Sciences Beijing100049China Sinopec Star Hubei New Energy Development Co. Ltd.Wuhan430010China Institute of Hydrogeology and Environmental Geology Chinese Academy of Geological SciencesShijiazhuang050061China

In unconsolidated sandstone reservoirs,presence of numerous movable grains and a complex grain size composition necessitates a clear understanding of the physical clogging process for effective groundwater recharge in groundwater-source heat pump *** investigate this,a series of seepage experiments was conducted under in situ stress conditions using unconsolidated sandstone samples with varying grain *** clogging phenomenon arises from the combined effects of grain migration and compaction,wherein the migration of both original and secondary crushed fine-grain particles blocks the seepage ***,grain composition influences the migration and transport properties of the *** samples composed of smaller grains,the apparent permeability demonstrates a transition from stability to *** contrast,samples with larger grains experience a skip at the stability stage and directly enter the decrease stage,with a minor exception of a slight increase ***,a unique failure mode characterized by diameter shrinkage in the upper part of the sample is observed due to the combined effects of grain migration and in situ stress-induced *** testing results contribute to a better understanding of the clogging mechanism caused by the coupled effects of grain migration and compaction during groundwater recharge in unconsolidated sandstone reservoirs used in groundwater-source heat pump systems.

关键词： Groundwater-source heat pump Clogging Grain migration Compaction effect Groundwater recharge Unconsolidated sandstone

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Coupled thermo-hydro-mechanical simulation of CO2 enhanced gas recovery with an extended equation of state module for TOUGH2MP-FLAC3D

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Journal of Rock Mechanics and Geotechnical Engineering 2016年第6期8卷 904-920页

作者： Yang Gou Zhengmeng Hou Mengting Li Wentao Feng hejuan liu Energy Research Center of Lower Saxony GoslarGermany Sino-German Energy Research Center Sichuan UniversityChengduChina Institute of Petroleum Engineering Clausthal University of TechnologyClausthal-ZellerfeldGermany Institut National de la Recherche Scientifique-Eau Terre Environnement Research Center(INRS-ETE) QuébecCanada

As one of the most important ways to reduce the greenhouse gas emission,carbon dioxide（CO2）enhanced gas recovery（CO2-EGR） is attractive since the gas recovery can be enhanced simultaneously with *** on the existing equation of state（EOS） module of TOUGH2 MP,extEOS7C is developed to calculate the phase partition of H2O-CO2-CH4-NaCl mixtures accurately with consideration of dissolved NaCI and brine properties at high pressure and temperature *** show that it can be applied up to the pressure of 100 MPa and temperature of 150℃.The module was implemented in the linked simulator TOUGH2MP-FLAC3 D for the coupled hydro-mechanical simulations.A simplified three-dimensional（3D）1/4 model（2.2 km×1 km×1 km） which consists of the whole reservoir,caprock and baserock was generated based on the geological conditions of a gas field in the North German *** simulation results show that,under an injection rate of 200,000 t/yr and production rate of 200,000 sm3/d,CO2breakthrough occurred in the case with the initial reservoir pressure of 5 MPa but did not occur in the case of 42 *** low pressure conditions,the pressure driven horizontal transport is the dominant process;while under high pressure conditions,the density driven vertical flow is *** the considered conditions,the CO2-EGR caused only small pressure *** largest pore pressure increase（2 MPa） and uplift（7 mm） occurred at the caprock bottom induced by only *** caprock had still the primary stress state and its integrity was not *** formation water salinity and temperature variations of ±20℃ had small influences on the CO2-EGR *** order to slow down the breakthrough,it is suggested that CO2-EGR should be carried out before the reservoir pressure drops below the critical pressure of CO2.

关键词： Carbon dioxide (CO2) enhanced gas recovery (CO2-EGR) CO2 sequestration Equation of state (EOS) Coupled thermo-hydro-mechanical (THM) modeling TOUGH2MP-FLAC3D

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A Numerical Simulation Study of Temperature and Pressure Effects on the Breakthrough Pressure of CO_(2)in Unsaturated Low-permeability Rock Core

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Acta Geologica Sinica(English Edition) 2023年第3期97卷 911-924页

作者： HU Zhikai LI Yi LI Qi DIAO Yujie MA Xin liu hejuan FENG Guanhong WANG Fugang YU Qingchun Key Laboratory of Coast Civil Engineering Structure and Safety of Education Ministry School of Civil EngineeringTianjin UniversityTianjin 300350China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071China Key Laboratory of Carbon Dioxide Geological Storage Center for Hydrogeology and Environmental Geology SurveyChina Geological SurveyBaodingHebei 071051China Key Laboratory of Groundwater Resources and Environment(Jilin University) Ministry of EducationChangchun 130021China MOE Key Laboratory of Groundwater Circulation and Environmental Evolution China University of Geosciences(Beijing)Beijing 100083China

Gas breakthrough pressure is a key parameter to evaluate the sealing capacity of caprock,and it also plays important roles in safety and capacity of CO_(2)geological *** on the published experimental results,we present numerical simulations on CO_(2)breakthrough pressure in unsaturated low-permeability rock under 9 multiple P-T conditions(which can keep CO_(2)in gaseous,liquid and supercritical states)and thus,a numerical method which can be used to accurately predict CO_(2)breakthrough pressure on rock-core scale is *** simulation results show that CO_(2)breakthrough pressure and breakthrough time are exponential correlated with P-T ***,pressure has stronger effects on experimental results than that of ***,we performed sensitivity studies on the pore distribution indexλ(0.6,0.7,0.8,and 0.9)in van Genuchten-Muale *** show that with the increase ofλ,CO_(2)breakthrough pressure and breakthrough time both show decreasing *** other words,the larger the value ofλis,the better the permeability of the caprock is,and the worse the CO_(2)sealing capacity *** numerical method established in this study can provide an important reference for the prediction of gas breakthrough pressure on rock-core scale and for related numerical studies.

关键词： CO_(2)geological storage CO_(2)breakthrough pressure unsaturated low-permeability rock multiple P-T conditions numerical simulation

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全运会新闻叙事的历时性特征研究

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首都体育学院学报 2024年第1期36卷 57-67,87页

作者：张汝莹刘贺娟中国矿业大学(北京)文法学院北京100083 北京体育大学新闻与传播学院北京100084

新闻媒体报道是大型体育赛事推广的重要途径,能影响公众对大型体育赛事的认知和态度。采用新闻叙事学理论与系统功能语言学理论相结合的分析框架,通过文本挖掘与人工编码,以我国主流报纸近十多年的全运会新闻报道为例,探究全运会新闻叙... 详细信息

新闻媒体报道是大型体育赛事推广的重要途径,能影响公众对大型体育赛事的认知和态度。采用新闻叙事学理论与系统功能语言学理论相结合的分析框架,通过文本挖掘与人工编码,以我国主流报纸近十多年的全运会新闻报道为例,探究全运会新闻叙事的历时性特征。经研究发现,全运会新闻从关注赛事的竞技属性与社会效益向人才培养、群众体育等以人物为中心的主题转变,叙事模式从事件叙事、属性叙事向情感叙事转变,信息源与叙述方式日趋多样。全运会新闻叙事的历时性特征变化主要体现为:1)报道立场由结果导向转向过程导向;2)叙事内容由叙述赛事的外部性特征转向体验性特征;3)叙事模式从宣传模式转向人文关怀模式。这主要受我国生产力水平、体育文化软实力、地区经济发展水平、受众体育观念的影响,但是与我国主流报纸对国际体育赛事的新闻报道相比,全运会的新闻报道在叙事方式上仍有待进一步转变。

关键词：全运会新闻叙事主题建模叙事特征历时性变化

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中国主流英文媒体双奥新闻议程设置的嬗变——基于主题词的多元对应分析视角

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首都体育学院学报 2024年第4期36卷 374-384,415页

作者：张汝莹刘贺娟中国矿业大学(北京)文法学院北京100083 北京体育大学新闻与传播学院北京100084

中国主流英文媒体报道的双奥新闻是中国对外讲好体育故事的窗口,可以影响海外受众对我国体育发展状况的认知。采用基于主题词的多元对应分析法,分析中国主流英文媒体报道的双奥新闻的主要议题及其历时性变化,旨在探究双奥新闻议程设置... 详细信息

中国主流英文媒体报道的双奥新闻是中国对外讲好体育故事的窗口,可以影响海外受众对我国体育发展状况的认知。采用基于主题词的多元对应分析法,分析中国主流英文媒体报道的双奥新闻的主要议题及其历时性变化,旨在探究双奥新闻议程设置的嬗变。研究结果表明,夏奥会新闻聚焦于赛事的经济效益及竞技成绩,冬奥会新闻的主要议题则涉及外交、文化、科技、卫生等众多领域,议程设置及报道方式也更加多样。我国主流英文媒体报道双奥新闻的议程设置实现了从求同到自塑个性形象、从本土视角到全球视角、从凸显中国优势单项到注重中国多领域创新、从成果导向到过程导向的嬗变,反映了过去十余年我国主流英文媒体对双奥新闻的报道模式的变化和中国民众体育理念的转变。

关键词：中国主流英文媒体基于主题词的多元对应分析双奥新闻报道议程设置历时性特征

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叙事学视角下的体育赛事直播

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沈阳体育学院学报 2009年第5期28卷 45-48页

作者：刘贺娟刘红霞北京体育大学博士后流动站北京100084 沈阳体育学院体育社会科学研究中心辽宁沈阳110102

基于以文本内部形式为研究对象的叙事学理论,将08/09年NBA决赛直播视为影像文本,运用文本分析法对其进行剖析,进而得出体育赛事直播在叙事学视角下的独特规律。结果表明,对抗语境和设置悬念、延宕、叙事元素多样化、注重细节展示的叙事... 详细信息

基于以文本内部形式为研究对象的叙事学理论,将08/09年NBA决赛直播视为影像文本,运用文本分析法对其进行剖析,进而得出体育赛事直播在叙事学视角下的独特规律。结果表明,对抗语境和设置悬念、延宕、叙事元素多样化、注重细节展示的叙事策略以及英雄原型的选用,使本次直播取得了叙事学意义上的成功,获得了观众的喜爱;由于此次直播过于注重对获胜方英雄姿态的渲染,未能呈现给受众真实的比赛现场。

关键词： NBA赛事直播文本分析叙事策略英雄原型

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几种典型迭代算法在生物发光断层成像中的对比研究及评估（英文）

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激光与光电子学进展 2015年第8期52卷 254-262页

作者：刘合娟侯榆青贺小伟蒲鑫西北大学信息科学与技术学院陕西西安710127

生物发光断层成像是一种新型光学分子影像技术。基于稀疏正则化的迭代算法在解决重建中病态问题起着关键的作用。将4种典型的基于l1正则化的迭代算法(内点法、同伦算法、一阶方法和拉格朗日算法)应用于重建过程中,分别进行数学推导,并... 详细信息

生物发光断层成像是一种新型光学分子影像技术。基于稀疏正则化的迭代算法在解决重建中病态问题起着关键的作用。将4种典型的基于l1正则化的迭代算法(内点法、同伦算法、一阶方法和拉格朗日算法)应用于重建过程中,分别进行数学推导,并从重建精度和重建速度方面进行了实验对比和性能评估。实验结果表明尽管4种方法均能较好地重建出光源位置,但时间代价和重建能量大小上存在差异,据此结果为不同情况下重建算法的选取提出建议。

关键词：医用光学生物发光断层成像光源重建迭代算法 l1正则化

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日本动漫体育电影的文化审视

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日本研究 2010年第1期 120-124页

作者：刘贺娟北京体育大学

体育题材作品在日本动漫作品中占据了很大比重,日本人是怎样用动漫的形式诠释体育,透过动漫体育电影这个窗口可以看出日本民族的文化特征。于是,就有了日本动漫体育电影话题的产生,本文将以日本动漫体育电影为文本,分析日本动漫体育电... 详细信息

体育题材作品在日本动漫作品中占据了很大比重,日本人是怎样用动漫的形式诠释体育,透过动漫体育电影这个窗口可以看出日本民族的文化特征。于是,就有了日本动漫体育电影话题的产生,本文将以日本动漫体育电影为文本,分析日本动漫体育电影的叙事结构,并透视动漫体育电影中折射的民族文化性格。

关键词：日本文化动漫电影动漫文化

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