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Experimental Investigation of Skirted Foundation in Sand Subjected to Rapid Uplift 快速抬升作用下砂土中裙边基础试验研究
Q4 Environmental Science Pub Date : 2020-12-01 DOI: 10.1515/heem-2020-0002
M. Kulczykowski
Abstract This paper reports results from 1g model tests carried out under single gravity on a skirted foundation installed in sand and subjected to a rapid uplifting force. The effects of displacement rates ranging from 5 mm/s to 450 mm/s on the ultimate capacity, suction pressure inside the skirt compartment, and time of extraction were investigated. Test results indicate that the displacement rate significantly affected the magnitude of uplift resistance, as well as the magnitude of suction under the foundation lid, but had little effect on the relationship between stress and the displacement of the foundation. The shapes of the uplift capacity-displacement curve and the suction-displacement curve were similar for all experimental displacement rates.
摘要:本文报道了在单重力作用下,对设于砂土中的裙边基础进行的1g模型试验结果,并对其进行了快速上升力试验。研究了5 ~ 450 mm/s排量对裙房极限容量、抽吸压力和抽提时间的影响。试验结果表明,位移率对基础下的抗拔阻力大小和吸力大小有显著影响,但对基础的应力与位移关系影响不大。各试验位移速率下的抬升-位移曲线和吸力-位移曲线形状相似。
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引用次数: 4
Compound Channel’s Cross-section Shape Effects on the Kinetic Energy and Momentum Correction Coefficients 复合通道截面形状对动能和动量修正系数的影响
Q4 Environmental Science Pub Date : 2020-12-01 DOI: 10.1515/heem-2020-0004
Elham Ghanbari-Adivi
Abstract Since accurate estimation of the flow kinetic energy (α) and momentum (β) is not easily possible in compound channels, determining their accurate correction coefficients is an important task. This paper has used the “flood channel facility (FCF)” data and the “conveyance estimate system (CES)” model (which is 1D, but considers a term related to the secondary flow) to study how the floodplain width and the main channel wall slope and asymmetry affect the values of α and β. Results have shown that their maximum values at the highest floodplain width are, respectively, 1.36 and 1.13 times of those at the lowest case; an increase in the slope increased their maximum values by 1.05 and 1.01 times, respectively. The mean of error values showed that the CES model estimated the values α and β more accurately than the flow discharge. The maximum differences between the estimated and experimental values were 12.14% for α and 4.3% for β; for the flow discharge, it was 24.4%.
摘要由于在复合通道中很难准确估计流动动能(α)和动量(β),因此确定它们的精确校正系数是一项重要的任务。本文利用“洪道设施(FCF)”数据和“流量估算系统(CES)”模型(该模型是一维的,但考虑了与二次流相关的术语)研究了洪泛区宽度、主河道壁坡度和不对称性对α和β值的影响。结果表明:在河漫滩宽度最大时,其最大值分别是河漫滩宽度最小时的1.36倍和1.13倍;坡度的增加使其最大值分别增加1.05倍和1.01倍。误差值均值表明,CES模型对α和β值的估计比流量更准确。α的估计值与实验值的最大差异为12.14%,β的最大差异为4.3%;流动流量为24.4%。
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引用次数: 1
Distinct Element Simulation of a Landslide Process 滑坡过程的离散元模拟
Q4 Environmental Science Pub Date : 2020-12-01 DOI: 10.1515/heem-2020-0001
L. Zabuski, J. Mierczyński
Abstract The paper presents a numerical simulation of the development of a catastrophic landslide in a sandstone quarry and methods of reconstructing the quarry to its previous condition from before the landslide. The important objective of the paper is to present the capabilities of the numerical method used in the analysis of the landslide process, namely the Distinct Element Method (DEM). This method is poorly known, though it is capable of solving important geotechnical problems in which massive displacements are modelled. The features of the method are presented on the basis of a case study. Therefore a numerical analysis is carried out to show the performance of DEM in generating a displacement of several dozen meters in the example of a catastrophic landslide that occurred some years ago in a sandstone quarry. This engineering problem makes it possible to describe and analyse the mechanisms, causes and consequences of the landslide.
摘要本文对某砂岩采石场特大滑坡的发展过程进行了数值模拟,并提出了将该采石场从滑坡前恢复到原状的方法。本文的重要目的是介绍用于滑坡过程分析的数值方法,即离散单元法(DEM)的能力。这种方法鲜为人知,尽管它能够解决大规模位移建模的重要岩土工程问题。在实例分析的基础上,介绍了该方法的特点。因此,以几年前发生在砂岩采石场的灾难性滑坡为例,进行了数值分析,以显示DEM在产生几十米位移方面的性能。这一工程问题使得描述和分析滑坡的机理、原因和后果成为可能。
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引用次数: 0
Flow-induced Vibrations of a Horizontal Elastic Band Plate Submerged in Fluid of Finite Depth 水平弹性带板在有限深度流体中的流激振动
Q4 Environmental Science Pub Date : 2019-12-01 DOI: 10.1515/heem-2019-0007
K. Szmidt, B. Hedzielski
Abstract The paper deals with forced vibrations of a horizontal thin elastic plate submerged in a semi-infinite layer of fluid of constant depth. The pressure load on this plate is induced by water waves arriving at the plate. This load is accompanied by pressure resulting from the motion of the plate. The plate and fluid motions depend on boundary conditions, and, in particular, the pressure load depends on the width of the gap between the plate and the bottom. In theoretical description of the phenomenon, we deal with a coupled problem of hydrodynamics in which the plate and fluid motions are coupled through boundary conditions at the plate surfaces. The main attention is focused on transient solutions of the problem, which correspond to fluid (and plate) motion starting from rest. In formulation of this problem, a linear theory of small deflections of the plate is employed. In order to calculate the fluid pressure, a solution of Laplace’s equation is constructed in a doubly connected fluid domain. With respect to the initial value problem considered, we confine our attention to a finite fluid domain. For a finite elapse of time, measured from the starting point, the solution in the finite fluid area mimics a solution within an infinite domain, inherent for wave propagation problems. Because of the complicated structure of boundary conditions of the coupled problem considered, the fluid domain is divided into sub-domains of simple geometry, and the solutions of the problem equations are constructed separately in each of these domains. Numerical experiments have been conducted to illustrate the formulation developed in this paper.
本文研究了水平弹性薄板在等深半无限流体层中的强迫振动。该板上的压力载荷是由到达该板的水波引起的。这种载荷伴随着由板的运动产生的压力。板和流体的运动取决于边界条件,特别是压力载荷取决于板和底部之间的间隙宽度。在对这一现象的理论描述中,我们处理了一个流体动力学耦合问题,其中板和流体运动通过板表面的边界条件耦合。主要关注的是该问题的瞬态解,它对应于从静止开始的流体(和板)运动。在该问题的公式中,使用了板的小挠度的线性理论。为了计算流体压力,在双连通流体域中构造了拉普拉斯方程的解。关于所考虑的初值问题,我们将注意力局限于有限流体域。对于从起点开始测量的有限时间流逝,有限流体区域中的解模拟了波传播问题固有的无限域内的解。由于所考虑的耦合问题的边界条件结构复杂,将流体域划分为简单几何的子域,并在每个子域中分别构造问题方程的解。数值实验对本文提出的公式进行了说明。
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引用次数: 0
Construction of Pressure Tunnels 压力隧道的施工
Q4 Environmental Science Pub Date : 2019-12-01 DOI: 10.1515/heem-2019-0006
L. Zabuski
Abstract The paper focuses on two pressure tunnels in the design of “Kąty-Myscowa” water reservoir. One of them serves as a discharge conduit, whereas the other plays an energetic role. Their depths range between 0 and 75 metres and their diameters equal 5 m. Tunnels are located in the rock mass of Carpathian flysch which is anisotropic and heterogeneous, composed of layers of sandstone and clay shales and intersected with interbedding fissures and numerous joints. The paper is divided in two parts. The first part focuses on methods of excavating and supporting, as well as injecting and sealing (i.e. waterproofing) the tunnel. In the second part, a numerical analysis using the FLAC2D code based on the finite difference method was carried for calculating displacements and internal forces in the preliminary support and in permanent lining. Results of the analysis allow for the assessment of conditions in the tunnel during its excavation and exploitation stages.
摘要本文着重介绍了“Kāty Myscowa”水库设计中的两个压力隧洞。其中一个充当排放管道,而另一个则扮演着充满活力的角色。隧道深度在0米至75米之间,直径等于5米。隧道位于喀尔巴阡山复理石岩体中,该岩体各向异性且不均匀,由砂岩和粘土页岩层组成,并与互层裂缝和众多节理相交。本文分为两部分。第一部分重点介绍隧道的开挖和支护方法,以及隧道的注入和密封(即防水)方法。在第二部分中,使用基于有限差分法的FLAC2D程序对初期支护和永久衬砌的位移和内力进行了数值分析。分析结果可用于评估隧道开挖和开采阶段的条件。
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引用次数: 0
Modeling the Impact of Riparian Vegetation on Flow Structure and Bed Sediment Distribution in Rivers 河岸植被对河流水流结构和床沙分布影响的建模
Q4 Environmental Science Pub Date : 2019-12-01 DOI: 10.1515/heem-2019-0005
M. Morri, A. Soualmia
Abstract The effect of instream vegetation growth has largely been ignored by hydrological and geomorphological research in river environments, which focused instead on the function of riparian vegetation as a regulator of bank stability or as a buffer for dissolved and particulate matter entering the channel from the hillside. However, in many lowland streams, instream vegetation can be very intensive, resulting in high biomass levels during the growing season. Instream plants have a significant influence on the dynamics of flow, sediment, and nutrients. Plant growth can cause increased frictional resistance to flow and can have a short-to medium-term effects on the geomorphology of the channel. Additionally, plant development influences the velocity of river flow, affects sedimentation dynamics and increases flood risk. To achieve a balance between flooding and ecological management of rivers in the presence of vegetation, a reliable method is required to predict the resistance of channels. In the current study, a two-dimensional hydrodynamic and morphodynamic model is developed and applied using a new scaling expression of shear stress based on vegetation characteristics. These first attempts at field simulations showed qualitatively acceptable results and demonstrated the effectiveness of the model in predicting hydraulic parameters in the presence of vegetation. This model is useful in predicting the effect of vegetation on stream flow and river morphology, as well as in managing flood hazards and stream ecology.
摘要河流环境中的水文和地貌研究在很大程度上忽略了河道内植被生长的影响,而将重点放在河岸植被作为河岸稳定性的调节器或溶解物和颗粒物从山坡进入河道的缓冲区的功能上。然而,在许多低地溪流中,河道内植被可能非常密集,导致生长季节的生物量水平很高。河道内植物对水流、沉积物和营养物质的动力学有着重要的影响。植物生长会增加对水流的摩擦阻力,并对河道的地貌产生中短期影响。此外,植物发育会影响河流流速,影响沉积动力学,并增加洪水风险。为了在有植被的情况下实现洪水和河流生态管理之间的平衡,需要一种可靠的方法来预测河道的阻力。在当前的研究中,使用基于植被特征的剪切应力的新比例表达式,开发并应用了二维流体动力学和形态动力学模型。这些现场模拟的首次尝试显示了定性可接受的结果,并证明了该模型在植被存在的情况下预测水力参数的有效性。该模型可用于预测植被对溪流流量和河流形态的影响,以及管理洪水灾害和溪流生态。
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引用次数: 0
Experimental Study of the Effectiveness of a Combined Closure of the End Gate Pipeline Valve 端闸阀组合关闭效果的实验研究
Q4 Environmental Science Pub Date : 2019-06-01 DOI: 10.1515/heem-2019-0001
Henrikh H. Herasymov, Ievgenii Gerasimov, S. Ivanov, Oleg Pinchuk
Abstract One of the ways to ensure a reliable operation of irrigation systems is to protect them from water hammer (hydraulic shock) damage that occurs when starting or stopping a pumping station. This can be achieved by creating conditions in which a water hammer will not occur in the pressure pipeline as a result of closing the end gate valve (EGV). The aim of the present study was to investigate processes occurring in the pipeline during a linear closure of the EGV, during a closure with one break point and during an intermittent closure, as well as to verify the effectiveness of a combined end gate valve closure of the pipeline. Based on experimental data and calculations, the article recommends a linear closure of the EGV with one break point.
摘要确保灌溉系统可靠运行的方法之一是保护它们免受启动或停止泵站时发生的水锤(液压冲击)损坏。这可以通过创造条件来实现,在这种条件下,关闭端闸阀(EGV)不会在压力管道中产生水锤。本研究的目的是调查EGV线性关闭期间、一个断点关闭期间和间歇性关闭期间管道中发生的过程,并验证管道组合端闸阀关闭的有效性。基于实验数据和计算,本文建议采用一个断点的EGV线性闭合。
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引用次数: 1
Identification of the Causes of a Landslide in Koronowo (Polish Lowlands) 科罗诺沃(波兰低地)山体滑坡原因查明
Q4 Environmental Science Pub Date : 2019-06-01 DOI: 10.1515/heem-2019-0004
L. Zabuski, M. Kulczykowski, W. Świdziński
Abstract The paper discusses difficulties of identifying the causes of a landslide. These difficulties are illustrated in the example of a catastrophic landslide on the embankment of the western bank of the Brda River, which affected a bridge abutment of a disused narrow-gauge railway line from Bydgoszcz to Koronowo (Polish Lowlands). The railway was closed in 1992, and after the removal of the track, the bridge served as a pedestrian overpass. The landslide occurred in February 2011. Investigations revealed that the first signs of the landslide were cracks and subsidence that appeared at the embankment crest. Then, an initially slow movement accelerated suddenly, resulting in an over 45 m total displacement of the soil mass. The primary passive cause of the landslide movement resulted from the geology of the mass (loose soils underlain by cohesive soils) and from the steep inclination of the embankment surface. Active causes, however, are often ambiguous. In this case, no significant apparent phenomena which could trigger the movement occurred in the days preceding its initiation. Therefore, a detailed analysis of atmospheric conditions was carried out to identify and explain the causes. It was proved that the fundamental triggering cause of the landslide was a combination of rainfall, snowfall, snow-melting and air temperature. Moreover, an important cause was a faulty construction of a ditch with a sewage pipe on the crest of the embankment.
摘要本文讨论了确定滑坡成因的难点。这些困难在布尔达河西岸堤岸发生灾难性滑坡的例子中得到说明,它影响了一条从比得哥什到科罗诺沃(波兰低地)的废弃窄轨铁路线的桥台。铁路于1992年关闭,在拆除轨道后,这座桥被用作人行天桥。山体滑坡发生在2011年2月。调查显示,滑坡的最初迹象是路基顶部出现的裂缝和下沉。然后,最初缓慢的运动突然加速,导致土体的总位移超过45米。滑坡运动的主要被动原因是土体(粘性土下的松散土)的地质和路堤表面的陡峭倾斜。然而,积极的原因往往是模棱两可的。在这种情况下,在开始之前的几天里,没有明显的明显现象可以触发运动。因此,对大气条件进行了详细的分析,以确定和解释原因。论证了滑坡的根本触发原因是降雨、降雪、融雪和气温的综合作用。此外,一个重要的原因是一个沟渠的施工失误,在堤坝的顶部有一个污水管道。
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引用次数: 0
Three-Dimensional Analysis of a Landslide Process on a Slope in Carpathian Flysch 喀尔巴阡复理石坡面滑坡过程的三维分析
Q4 Environmental Science Pub Date : 2019-06-01 DOI: 10.1515/heem-2019-0003
L. Zabuski
Abstract The paper presents a 3D (spatial) analysis of deformation processes in the landslide slope Bystrzyca in Szymbark near Gorlice (Low Beskid – Carpathians; N 49°37′ 09″, E 21°05′ 49″) carried out by the computer code FLAC3D based on the finite difference method. The numerical analysis was performed to determine the influence of the orientation of layers and discontinuities and of hydrogeological conditions on slope deformations and the failure mechanism during sliding processes. The massif is modeled as an elasto-plastic medium obeying the Coulomb-Mohr criterion. Two variants of hydrogeological conditions are analyzed, namely the “dry slope” (without water) and the “wet slope” (entirely saturated). The influence of the orientation of discontinuities (modeled as “ubiquitous”) on the landslide mechanism is investigated as well. Few orientations of discontinuities with respect to the dip direction of the slope surface are considered, namely consequent, insequent, and subsequent (two variants in each case). The results show a clear impact of the pattern of discontinuities and hydrogeological conditions on the deformational behavior of the landslide and the shape of the slip surface. The 3D approach and results of the numerical simulation of the landslide movement prove the necessity of 3D modeling in some cases.
摘要本文采用有限差分法,用FLAC3D程序对Gorlice(Low Beskid–Carpathians;N 49°37′09〃,E 21°05′49〃)附近Szymback Bystrzyca滑坡的变形过程进行了三维(空间)分析。进行了数值分析,以确定滑动过程中地层和不连续面的方向以及水文地质条件对边坡变形和破坏机制的影响。岩体被建模为符合库仑莫尔准则的弹塑性介质。分析了水文地质条件的两种变体,即“干坡”(无水)和“湿坡”(完全饱和)。此外,还研究了不连续面(建模为“普遍存在”)的方向对滑坡机制的影响。很少考虑相对于坡面倾斜方向的不连续性方向,即顺向、不顺向和顺向(每种情况下有两种变体)。结果表明,不连续性模式和水文地质条件对滑坡的变形行为和滑面形状有明显的影响。滑坡运动的三维方法和数值模拟结果证明了在某些情况下进行三维建模的必要性。
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引用次数: 5
Impact of Natural Disasters on Water Resources in Georgia Caused by Global Warming 全球变暖导致的自然灾害对格鲁吉亚水资源的影响
Q4 Environmental Science Pub Date : 2019-06-01 DOI: 10.1515/heem-2019-0002
N. Kandelaki, I. Iordanishvili, A. Ujma, I. Iremashvili, Konstantin Iordanishvili, Shorena Kupreishvili, V. Shurghaia, Giorgi Natroshvili
Abstract Ecological and hydrological problems of water reservoirs on rivers of the Black Sea coast in the context of the increasing air temperature and emissions of greenhouse gases, the melting of glaciers, and the occurrence of floods and forest fires have been analysed in the given article. The article presents the results of field and theoretical studies of sedimentation processes in the large water reservoirs of Georgia focusing on their morphometric conditions during the warming period.
摘要:本文分析了在气温升高、温室气体排放增加、冰川融化、洪水和森林火灾发生的背景下,黑海沿岸河流水库的生态和水文问题。本文介绍了格鲁吉亚大型水库在变暖时期沉积过程的野外和理论研究结果,重点介绍了它们的形态测量条件。
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引用次数: 1
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Archives of Hydroengineering and Environmental Mechanics
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