|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | 软土地面中机械化双叠隧道的三维数值模拟(英文)显示文摘研究目的:通过三维数值模拟,研究隧道施工过程对双叠隧道的影响。创新要点:使用全三维数值模拟方法研究软土中双叠隧道施工对先挖隧道或地面的影响。研究方法:1.运用FLAC软件创建双叠隧道的三维数值模型(图1);2.分情况模拟机械化双叠隧道的挖掘过程;3.研究不同情况下的地面沉降,水平地面位移,以及隧道衬砌的法向位移、法向力、纵向力和弯曲力矩等。重要结论:1.新隧道施工对现有的隧道有很大的影响,最大影响出现在先挖上层隧道的情况下;2.一般来说,上层隧道的挖掘会比下层隧道产生更大的地面沉降;3.下层隧道产生的法向力总是比上层隧道大;4.在多数情况下,下层隧道产生的法向位移和弯曲力矩要比上层隧道小。 | Ngoc-Anh DO Daniel DIAS Pierpaolo ORESTE | 2014 | Journal of Zhejiang University-Science A(Applied Physics & Engineering)2014，15，11： | 12 |
| 2 | Behavior of noncircular tunnels excavated in stratified rock masses-Case of underground coal mines显示文摘The amount of tunnels excavated along stratified/sedimentary rock masses in Quangninh coal mine area,Vietnam, is gradually increasing. Rock mass in Quangninh is characterized by beddings between rock layers. The behavior of stratified rock masses surrounding the tunnels depends on both the intact rock and the beddings between rock layers. The main characteristics of stratified rock masses that need to be considered are their heterogeneity and anisotropy. Depending on the dip angle of rock layers, movements and failure zones developed surrounding the tunnels can be asymmetrical over the vertical axis of tunnel. This asymmetry causes adverse behaviors of the tunnel structures. The objective of this study is to highlight convergences and yielded zones developed in rock masses surrounding noncircular tunnels in Quangninh coal mine area using a finite element method. The presence of bedding joints is explicitly simulated. The numerical results indicated that with the increase in dip angle of bedding joints, the stress asymmetry over the tunnel vertical axis increases. It gradually leads to an asymmetry of the failure zone surrounding the tunnel. An increase of rock mass quality means a decrease of rock mass sensitivity to the discontinuities. In addition,a dip angle of the bedding joints of approximately 45° could be considered as the critical angle at which the rock mass mechanism changes between sliding and bending. | Ngoc Anh Do Daniel Dias Van Diep Dinh Tien Tung Tran Van Canh Dao Viet Doan Dao Phuc Nhan Nguyen | 2019 | Journal of Rock Mechanics and Geotechnical Engineering2019，11，1： | 9 |
| 3 | Three-dimensional finite difference analysis of shallow sprayed concrete tunnels crossing a reverse fault or a normal fault: A parametric study显示文摘Urban tunnels crossing faults are always at the risk of severe damages.In this paper,the efects of a reverse and a normal fault movement on a transversely crossing shallow shotcreted tunnel are investigated by 3D finite difference analysis.After verifying the accuracy of the numerical simulation predictions with the centrifuge physical model results,a parametric study is then conducted.That is,theleffects of various parameters such as the sprayed concrete thickness,the geo-mechanical properties of soil,the tunnel depth,and the fault plane dip angle are studied on the displacements of the ground surface and the tunnel structure,and on the plastic strains of the soil mass around tunnel.The results of each case of reverse and normal faulting are independently discussed and then compared with each other.It is obtained that deeper tunnels show greater displacements for both types of faulting. | Masoud RANJBARNIA Milad ZAHERI Daniel DIAS | 2020 | Frontiers of Structural and Civil Engineering2020，14，4： | 4 |
| 4 | 主动学习型克里金模型在掌子面可靠度分析中的应用——以双层土隧道为例(英文)显示文摘本文旨在研究双层土壤中隧道开挖时掌子面的稳定性问题。首先,假设双层土壤的分界面位于隧道拱顶上方,以极限分析方法为依据,采用旋转破坏机制构建掌子面失稳模型,同时,考虑了开挖介质的剪切强度参数随机性对掌子面稳定性的影响。采用克里金模型代替其原始的功能函数,进而采用蒙特卡洛法计算掌子面的破坏概率,从而大大提高了计算效率和节约了计算成本。本文采用主动学习函数对克里金模型进行训练,因此,可以确保其对掌子面破坏概率的预测高效而不失准确性。本文首先建立了隧道掌子面破坏模型,通过计算分析,验证了所提出模型的正确性,随后讨论了随机变量的初始采样点数、相关系数、分布类型和变异系数等对隧道掌子面稳定性的影响。研究结果表明该方法是一种高效精确的可靠度分析方法,可以为隧道设计提供一定的理论指导和依据。 | 李天正 DIAS Daniel | 2019 | Journal of Central South University2019，26，7： | 4 |
| 5 | Effect of surcharge loading on horseshoe-shaped tunnels excavated in saturated soft rocks显示文摘Underground facilities are usually constructed under existing buildings,or buildings are constructed over existing underground structures.It is then imperative to account for the current overburden loads and future surface loadings in the design of tunnels.In addition,tunnels are often constructed beneath the groundwater level,such as cross-river tunnels.Therefore,it is also important to consider the water pressure impact on the tunnel lining behaviour.Tunnels excavated by a conventional tunnelling method are considered in this paper.The hyperstatic reaction method(HRM)is adopted in this study to investigate the effect of surcharge loading on a horseshoe-shaped tunnel behaviour excavated in saturated soft rocks.The results obtained from the HRM and numerical modelling are in good agreement.Parametric studies were then performed to show the effects of the water pressure,surcharge loading value and its width,and groundwater level on the behaviour of the horseshoe-shaped tunnel lining,in terms of internal forces and displacements.It displays that the bending moment,normal forces and radial displacements are more sensitive to the water pressure,surcharge loading and groundwater level. | Dianchun Du Daniel Dias Ngocanh Do | 2020 | Journal of Rock Mechanics and Geotechnical Engineering2020，12，6： | 3 |
| 6 | Probabilistic analysis of ultimate seismic bearing capacity of strip foundations显示文摘This paper presents a reliability analysis of the pseudo-static seismic bearing capacity of a strip foundation using the limit equilibrium theory. The first-order reliability method(FORM) is employed to calculate the reliability index. The response surface methodology(RSM) is used to assess the Hasofer e Lind reliability index and then it is optimized using a genetic algorithm(GA). The random variables used are the soil shear strength parameters and the seismic coefficients(k_h and k_v). Two assumptions(normal and non-normal distribution) are used for the random variables. The assumption of uncorrelated variables was found to be conservative in comparison to that of negatively correlated soil shear strength parameters. The assumption of non-normal distribution for the random variables can induce a negative effect on the reliability index of the practical range of the seismic bearing capacity. | Adam Hamrouni Badreddine Sbartai Daniel Dias | 2018 | Journal of Rock Mechanics and Geotechnical Engineering2018，10，4： | 3 |
| 7 | Structural phase relations in perovskite-structured BiFeO_(3)-based multiferroic compounds显示文摘In this review,the state of the art in understanding the structural phase relations in perovskite-structured BiFeO_(3)-based polycrystalline solid solutions is presented and discussed.Issues about the close relation between the structural phase and overall physical properties of the reviewed systems are pointed out and discussed.It is shown that,by adjusting the structural symmetric arrangement,the ferroelectric and magnetic properties of BiFeO_(3)-based polycrystalline solid solutions can be tuned to find specific multifunctional applications.However,an intrinsic mechanism linking structural arrangement and physical properties cannot be identified,revealing that this subject still deserves further discussion and investigation. | Valdirlei Fernandes FREITAS Gustavo Sanguino DIAS Otávio Algusto PROTZEK Diogo Zampieri MONTANHER Igor Barbosa CATELLANI Daniel Matos SILVA Luiz Fernando CÓTICA Ivair Aparecido dos SANTOS | 2013 | Journal of Advanced Ceramics2013，2，2： | 2 |
| 8 | 水位下降条件下非均质边坡稳定性分析(英文)显示文摘与均质边坡相比,非均质边坡对于实际工程中更具意义。本研究着重讨论土体非均质性在四种水位下降模式下对边坡稳定性的影响。在考虑分层与强度随深度线性增加两类典型非均质性的基础上,定义了非均匀性系数以量化土体强度的非均质性程度。采用改进的离散上限分析法,计算了不同工况下非均质边坡的安全系数Fs,研究了Fs 随摩擦角非均匀系数以及水位高度的变化规律。整体上看Fs 与摩擦角非均匀系数呈线性相关,而水位对Fs 的影响与均质边坡基本相似。 | 孙志彬 疏醒 Daniel DIAS | 2019 | Journal of Central South University2019，26，7： | 2 |
| 9 | Stability of fruit quality traits in diverse watermelon cultivars tested in multiple environments显示文摘Lycopene is a naturally occurring red carotenoid compound that is found in watermelon.Lycopene has antioxidant properties.Lycopene content,sugar content and hollowheart resistance are subject to significant genotype×environment interaction(G×E),which makes breeding for these fruit quality traits difficult.The objectives of this study were to(i)evaluate the influence of years and locations on lycopene content,sugar content and hollowheart resistance for a set of watermelon genotypes,and(ii)identify genotypes with high stability for lycopene,sugar,and hollowheart resistance.A diverse set of 40 genotypes was tested over 3 years and 8 locations across the southern United States in replicated,multi-harvest trials.Lycopene was tested in a subset of 10 genotypes.Data were analyzed using univariate and multivariate stability statistics(BLUP-GGE biplot)using SASGxE and RGxE programs.There were strong effects of environment as well as G×E interaction on watermelon quality traits.On the basis of stability measures,genotypes were classified as stable or unstable for each quality trait.'Crimson Sweet'is an inbred line with high quality trait performance as well as trait stability.'Stone Mountain','Tom Watson','Crimson Sweet'and'Minilee'were among the best genotypes for lycopene content,sugar content and hollowheart resistance.We developed a stability chart based on marketable yield and average ranking generated from different stability measures for yield attributes and quality traits.The chart will assist in choosing parents for improvement of watermelon cultivars.See http://gffzz783b6e01a04243c3h9bp0fuuvf6bc69qk.ffgz.tsg.suse.edu.cn/cucurbit/wmelon/wmelonmain.html. | Mahendra Dia Todd C Wehner Penelope Perkins-Veazie Richard Hassell Daniel S Price George E Boyhan Stephen M Olson Stephen R King Angela R Davis Gregory E Tolla Jerome Bernier Benito Juarez | 2016 | Horticulture Research2016，3，1： | 2 |
| 10 | Exfoliated titanate, niobate and titanoniobate nanosheets as solid acid catalysts for the liquid-phase dehydration of d -xylose into furfural显示文摘 | Ana S. Dias Sérgio Lima Daniel Carriazo Vicente Rives Martyn Pillinger Anabela A. Valente | 2006 | Journal of Catalysis2006，，2： | 1 |
| 11 | Soil spatial variability impact on the behavior of a reinforced earth wall显示文摘This article presents the soil spatial variability effect on the performance of a reinforced earth wall.The serviceability limit state is considered in the analysis.Both cases of isotropic and anisotropic non-normal random fields are implemented for the soil properties.The K arhunen-Loeve expansion method is used for the discretization of the random field.Numerical finite difference models are considered as deterministic models.The Monte Carlo simulation technique is used to obtain the deformation response variability of the reinforced soil retaining wall.The influences of the spatial variability response of the geotechnical system in terms of horizontal facing displacement is presented and discussed.The results obtained show that the spatial variability has an important influence on the facing horizontal displacement as well as on the failure probability. | Adam HAMROUNI Daniel DIAS Badreddine SBARTAI | 2020 | Frontiers of Structural and Civil Engineering2020，14，2： | 1 |
| 12 | Atypical posterior reversible encephalopathy syndrome: a flare of systemic lupus erythe- matosus显示文摘 | Cecilia Monteiro Isabel Almeida Daniel Dias etal | 2012 | The Journal of rheumatology2012，1，39： | 1 |
| 13 | Three-Dimensional Numerical Simulation of a Mechanized Twin Tunnels in Soft Ground显示文摘 | Ngoc-Anh Do Daniel Dias Pierpaolo Oreste Irini Djeran-Maigre | 2014 | Tunnelling and Underground Space Technology incorporating Trenchless Technology Research2014，，： | 1 |
| 14 | Impact of constitutive models on the numerical analysis of underground constructions 显示文摘 | Yousef Hejazi Daniel Dias Richard Kastner | 2008 | Acta Geotechnica2008，3，： | 1 |
| 15 | High-performance web site design techniques显示文摘 | Arun Iyengar Jim Challenge Daniel Dias | 2000 | IEEE Intemet Computing2000，4，2： | 1 |
| 16 | Contribution of marrow-derived progenitors to vascular and cardiac regeneration显示文摘 | Shahin Rafii Sarah Meeus Sergio Dias Koichi Hattori Beate Heissig Sergey Shmelkov Daniel Rafii David Lyden | 2002 | Seminars in Cell and Developmental Biology2002，，1： | 1 |
| 17 | Movements caused by the excavation of tunnels using face pressurized shields — Analysis of monitoring and numerical modeling results显示文摘 | Daniel Dias Richard Kastner | 2013 | Engineering Geology2013，，1： | 1 |
| 18 | Discrete element modelling of a granular platform supported by piles in softsoil-validation on a small scale model test and comparison to a numerical analysis in a continuum 显示文摘 | ORIANNE JENCK DANIEL DIAS | 2009 | Computers and Geotechnics2009，36，6： | 1 |
| 19 | Technological Aspects of 13- Carotene Production显示文摘 | Bernardo Dias Ribeiro Daniel Weingart Barreto Maria Alice Zarur Coelho | 2011 | Food Bioprocess Tech2011，，4： | 1 |
| 20 | Numerical analysis of the behavior of mechanically stabilized earth walls reinforced with different types of strips显示文摘 | Abdelkader Abdelouhab Daniel Dias Nicolas Freitag | 2011 | Geotextiles and Geomembranes2011，29，11： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员