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Dam Incidents and Failures – Cases in the Czech Republic 大坝事故和失败——捷克共和国的案例
IF 0.4 Pub Date : 2023-03-01 DOI: 10.2478/sjce-2023-0003
Stanislav Kotaška, J. Říha
Abstract Dam incidents and failures mainly occur during extreme floods. In the Czech Republic (CR), large-scale regional floods were recorded in different regions in 1985, 1987, 1997, 2002, 2006, 2010, and 2013, while local floods especially occurred in 1991, 1996, 1997, 1998, 2002, 2004, 2005, 2009, and 2010. During these events, numerous incidents and total breaches of small dams were recorded, and a few large dams were also critically endangered, although they were not completely breached. This paper presents a comprehensive summary of incidents and failures affecting small dams in the CR since 1985. The most significant incidents concerning large dams are listed as well. The statistics show that 62 small dams were completely breached and that 350 were seriously damaged over 35 years in the period 1985–2020. The annual frequency amounts to 1.85 collapsed and 10 small damaged dams per year. The most common causes of the complete breaching of dams were overtopping (85 %) and internal erosion (15 %).
摘要大坝事故和溃坝主要发生在特大洪水时期。捷克共和国1985年、1987年、1997年、2002年、2006年、2010年和2013年发生了不同地区的大规模区域性洪水,而1991年、1996年、1997年、1998年、2002年、2004年、2005年、2009年和2010年发生了局地洪水。在这些事件中,记录了许多小水坝的事件和完全决口,一些大型水坝虽然没有完全决口,但也处于极度濒危状态。本文对1985年以来影响长江流域小坝的事故和溃坝进行了综合总结。还列出了与大型水坝有关的最重大事件。统计数据显示,1985年至2020年的35年间,有62座小水坝完全溃决,350座严重受损。每年有1.85座水坝倒塌,10座小型水坝受损。大坝完全决口最常见的原因是漫顶(85%)和内部侵蚀(15%)。
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引用次数: 1
The Impact of Climate Change and Regulation of the Water Regime on the Morphological Structure of the Floodplain Forests in Petržalka, Slovakia 气候变化和水态调控对斯洛伐克Petržalka漫滩森林形态结构的影响
IF 0.4 Pub Date : 2023-03-01 DOI: 10.2478/sjce-2023-0006
Viktória Gáspár, A. Škrinár
Abstract The main landscape-forming component has always been the forests in the lowlands. The devastation and disturbance of forest areas by anthropogenic activity change the ecological conditions in their environment. Climate and atmospheric changes affect the balance of the mutual relationships between individual components, as well as the existence of direct and feedback relationships in forest ecosystems. The transformation of bioclimatic and ecological conditions have caused the degradation of the Pannonian floodplain forest communities in Slovakia. Urbanization in Bratislava has caused the fragmentation of the surrounding forests. With changes in sunlight and heat conditions, flood-plain communities are forced to become acclimatized to drier conditions, which lead to morphological and structural changes in their composition. In this study we examined phytocenological records from 1999 to 2020 from various sources. The survey points to the impact of climate change and anthropogenic influences on biodiversity. The absence of floods and the drying of floodplain forest soils could have caused this change in the species' composition.
摘要低地森林一直是形成景观的主要成分。人为活动对林区的破坏和干扰,改变了林区环境的生态条件。气候和大气变化影响着森林生态系统中各组分之间相互关系的平衡,也影响着森林生态系统中直接关系和反馈关系的存在。生物气候和生态条件的变化导致了斯洛伐克潘诺尼亚洪泛区森林群落的退化。布拉迪斯拉发的城市化导致了周围森林的破碎。随着日照和热条件的变化,洪泛平原群落被迫适应干旱条件,从而导致其组成的形态和结构变化。在这项研究中,我们从各种来源检查了1999年至2020年的植物生物学记录。该调查指出了气候变化和人为影响对生物多样性的影响。洪水的缺乏和洪泛区森林土壤的干燥可能导致了物种组成的变化。
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引用次数: 0
Hardening Accelerators (X-Seed 100 BASF, PCC, LKD and SALT) as Strength-Enhancing Admixture Solutions for Soil Stabilization 硬化加速剂(X-Seed 100 BASF, PCC, LKD和SALT)作为土壤稳定的强度增强添加剂溶液
IF 0.4 Pub Date : 2023-03-01 DOI: 10.2478/sjce-2023-0002
P. Lindh, Polina Lemenkova
Abstract This study is aimed at evaluating the strength of stabilised soil collected from the Port of Norvik, Stockholm, Sweden, where 350,000 m3 of clay had to be stabilized. The tests were performed in the laboratory of the Swedish Geotechnical Institute (SGI). The soil was stabilised by binder mixtures using Portland cement clinker (PCC) and lime and lime kiln dust (LKD). Accelerators (X-seed 100 BASF, PCC, LKD and salt) were added to the soil samples for quicker stabilization. The strength of the stabilised soil was assessed using resonance frequency measurements of seismic P-waves by an ICP accelerometer in order to estimate the shear strength of the soil and to evaluate the effects from the accelerators, binder ratios, and the curing temperature on the gains in stabilization and strength. Various proportions of the binders were tested, i.e.: 50/50 cement/lime and 50/50 PCC/lime. The temperature was measured using a calorimeter in double experiments. The results showed that the accelerators improve the strength in the stabilized specimens and enhance the soil performance for engineering construction work.
摘要本研究旨在评估从瑞典斯德哥尔摩Norvik港采集的稳定土的强度,该港需要稳定350000 m3的粘土。试验在瑞典岩土工程研究所(SGI)的实验室进行。使用波特兰水泥熟料(PCC)和石灰和石灰窑尘(LKD)的粘合剂混合物稳定土壤。将促进剂(X-seed 100 BASF、PCC、LKD和盐)添加到土壤样品中以更快地稳定。使用ICP加速度计对地震P波的共振频率测量来评估稳定土壤的强度,以估计土壤的抗剪强度,并评估加速器、粘结剂比例和固化温度对稳定和强度增益的影响。测试了不同比例的粘合剂,即:50/50水泥/石灰和50/50 PCC/石灰。在双实验中使用量热计测量温度。结果表明,加速剂提高了稳定试件的强度,提高了工程施工中的土壤性能。
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引用次数: 1
Investigation of the Effects of Additives used in Reducing Asphalt Production Temperatures 添加剂在降低沥青生产温度中的作用研究
IF 0.4 Pub Date : 2023-03-01 DOI: 10.2478/sjce-2023-0004
Süleyman Nurullah Adahi Şahin, M. İpek, Mehmet Bariş Gökçek
Abstract This study is related to evaluations of the performance and usability evaluations of existing and also newly produced Warm Mixed Asphalt (WMA) additives. Viscosity, softening point, and penetration tests were performed on bitumen with additives without changing the bitumen rate for the additives. For the asphalt concrete, Marshall Stability tests were performed. WMA additives are used to reduce asphalt production temperatures and, consequently, the temperature of the mixture significantly. According to the Marshall Stability test, it was determined that the WMA samples fulfilled values within the local standards. The Hot Mixed Asphalt (HMA) and Warm Mixed Asphalt (WMA) additives were compared as to additive costs and energy savings considering the reduced production temperatures. Additives have great potential to be used in adverse weather conditions and in many countries.
摘要本研究对现有和新生产的温拌沥青(WMA)添加剂进行了性能评价和可用性评价。在不改变沥青率的情况下,对添加了添加剂的沥青进行了粘度、软化点和渗透试验。对沥青混凝土进行了马歇尔稳定性试验。WMA添加剂用于降低沥青生产温度,从而显著降低混合料的温度。根据马歇尔稳定性测试,确定WMA样品符合当地标准内的值。考虑到生产温度的降低,对热拌沥青(HMA)和温拌沥青(WMA)添加剂的成本和节能进行了比较。添加剂在许多国家的恶劣天气条件下具有巨大的应用潜力。
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引用次数: 0
Comparative Study of Lightweight Concretes Based on Hemp and Flax Straw 大麻与亚麻秸秆轻质混凝土的对比研究
IF 0.4 Pub Date : 2022-12-01 DOI: 10.2478/sjce-2022-0023
M. Babenko, A. Eštoková, S. Unčík, M. Savytskyi
Abstract The article presents the results of a study involving the properties of flax and hemp-based lightweight concretes as well as the initial characteristics of different straw-based materials. A comparison of straw-based lightweight concretes with and without ordinary Portland cement (OPC) showed that hemp concrete has a 5.6 % higher strength at a 10% deformation, and at the same time, has a 13% greater thermal conductivity coefficient than flax concrete. The physical-chemical study based on a thermal analysis in an air environment has shown that the overall picture of thermal degradation for flax and hemp concretes is similar. Nevertheless, additional peaks of mass loss have been defined for flax concrete. The demonstrated exothermal process is a positive aspect, considering the life cycle of the material and the recycling stage. The paper proposes reference points for the development of new building materials based on straw.
摘要本文介绍了亚麻和大麻基轻质混凝土的性能研究结果,以及不同秸秆基材料的初始特性。稻草基轻质混凝土与普通硅酸盐水泥(OPC)的比较表明,大麻混凝土在10%的变形下强度高5.6%,同时导热系数比亚麻混凝土高13%。基于空气环境中热分析的物理化学研究表明,亚麻和大麻混凝土的热降解总体情况相似。然而,已经为亚麻混凝土定义了额外的质量损失峰值。考虑到材料的生命周期和回收阶段,所展示的放热过程是一个积极的方面。本文提出了以秸秆为原料开发新型建筑材料的参考点。
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引用次数: 1
Physical-Mechanical Properties of Waterproofing Materials Applied to Roofs in the Context of UV Degradation 紫外线降解条件下屋顶防水材料的物理力学性能
IF 0.4 Pub Date : 2022-12-01 DOI: 10.2478/sjce-2022-0027
Jozef Kováč, M. Palko, A. Kleinová
Abstract The subject of the article is a physical-mechanical analysis of waterproofing materials exposed to an external environment. Physical and mechanical properties have a direct impact on the life of waterproofing materials and their later remediation. In the introduction, the factors influencing the properties of waterproofing materials are presented. The main part of the article covers the basic possibilities of testing the materials testing the materials, normative testing conditions, and critical aspects of their implementation. In this article we deal with the laboratory testing of a waterproofing membrane based on PVC-P in terms of its degradation from UV radiation, humidity, and the temperature.
摘要本文的主题是防水材料在外部环境下的物理力学分析。物理力学性能直接影响防水材料的使用寿命及其后期的修复。介绍了影响防水材料性能的因素。文章的主要部分涵盖了测试材料的基本可能性,测试材料的规范性测试条件,以及其实施的关键方面。在这篇文章中,我们讨论了基于PVC-P的防水膜在紫外线辐射、湿度和温度下的降解的实验室测试。
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引用次数: 0
Redesign of an Intake Fish Pass Structure 进气鱼道结构的重新设计
IF 0.4 Pub Date : 2022-12-01 DOI: 10.2478/sjce-2022-0028
L. Čubanová, P. Dusicka, Martin Orfánus, J. Rumann
Abstract The article describes the process of redesigning the intake structure of the fish pass at the Žilina water structure in Slovakia. The existing intake structure does not meet the passability requirements for the target species of migratory fish. A design utilizing intake windows at various levels that cover fluctuations in the water level in the reservoir, which has been successfully used for other water structures, has been proposed. The new design was subjected to hydraulic calculations and simulations in the HECRAS 2D, 2D numerical model in order to achieve the required parameters such as the discharges, depths, and velocities within the limits for the specified fish zone.
摘要本文介绍了斯洛伐克Žilina水结构鱼道进气结构的重新设计过程。现有的进水口结构不符合目标洄游鱼类通过性要求。提出了一种利用不同水平的进水窗来覆盖水库水位波动的设计,这种设计已成功地用于其他水结构。新设计在HECRAS 2D、2D数值模型中进行了水力计算和模拟,以便在指定鱼区范围内获得所需的参数,如流量、深度和速度。
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引用次数: 1
The Effectiveness of the Implementation of Research Results in a Technological Scheme of Water Purification 一种水净化技术方案研究成果的实施效果
IF 0.4 Pub Date : 2022-12-01 DOI: 10.2478/sjce-2022-0024
O. Galkina, Sergiy Kunytskyi, Tamara Shevchenko
Abstract The paper proposes technical solutions for the use of the reagent method of water preparation at coke plants in order to bring it to a quality suitable for use in the circulating water supply system of the PJSC Kharkiv Coke Plan. It is proposed to dilute phenolic water in a biochemical installation in a mixer before purification and to purify water with a flocculant. The paper recommends dosing the flocculant solution automatically using a preparation station. Additional purification of the clarified water is carried out using a filtration unit with a filter media from a layer of quartz sand. The economic effect from the implementation of the technical measures is achieved not only due to the reduction in fresh water consumption by 60 540 m3/year and the cessation of the discharge of phenolic water into the city sewer network, but also the replacement of the reagent with a more efficient one and a decrease in its consumption. It has been found that the introduction of the technical solutions for the circulating water supply system is economically and environmentally justifiable.
摘要本文提出了在焦化厂使用试剂法制水的技术解决方案,以使其达到适合PJSC哈尔科夫焦炭计划循环水供应系统使用的质量。建议在净化前在混合器中的生化装置中稀释酚类水,并用絮凝剂净化水。本文建议使用制备站自动给药絮凝剂溶液。使用具有来自石英砂层的过滤介质的过滤单元对澄清水进行额外的纯化。该技术措施的实施取得了经济效果,这不仅是因为淡水消耗量减少了60 540 m3/年,酚类水停止排入城市下水道网络,而且还因为用更高效的试剂代替了试剂,减少了其消耗。已经发现,引入循环水供应系统的技术解决方案在经济和环境上是合理的。
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引用次数: 0
The Compaction of Energy and Properties of Roller-Compacted Concrete Pavement with Fillers 填料碾压混凝土路面能量压实及性能研究
IF 0.4 Pub Date : 2022-12-01 DOI: 10.2478/sjce-2022-0025
N. Saoudi, H. Cherfa, B. Saoudi, Bodjemaa Zaanoun
Abstract This case study aims to investigate the effects of compaction methods on the mechanical behavior of roller compacted concrete pavement (RCCP) mixtures, which consist of the replacement of different cement by 0%, 5%, and 10% limestone by volume fraction and which were compacted by two compaction methods. These methods are commonly discussed in the literature and were developed to simulate the site conditions in the laboratory. A modified Proctor test was adopted in the mix’s proportional process to optimize the aggregate’s percentage content of RCCP. The experimental series consisted of compression and split tensile performance tests to investigate the development of compaction performances at 28 days. The results showed that, where 10% of the cement was substituted by limestone, the RCC gives important flexural strength values compared to the quantity of the cement substitute. Qualitatively, the reduction in the strength of the concrete using the modified Proctor compaction method led to the weakness of the bond between the layers.
摘要本案例研究旨在研究压实方法对碾压混凝土路面(RCCP)混合料力学性能的影响。碾压混凝土路面混合料由体积分数为0%、5%和10%的石灰石代替不同的水泥组成,并采用两种压实方法压实。这些方法在文献中经常讨论,并且是为了在实验室中模拟现场条件而开发的。在混合料的配比过程中采用了改良的普氏试验,以优化集料中RCCP的百分比含量。试验系列包括压缩和劈拉性能试验,以研究28天压实性能的发展。结果表明,当10%的水泥被石灰石替代时,与水泥替代物的数量相比,碾压混凝土具有重要的抗弯强度值。定性地说,使用改良的普氏压实法降低混凝土强度导致层间粘结薄弱。
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引用次数: 0
The Potential and Implications of Automated Pre-Processing of LiDAR-Based Digital Elevation Models for Large-Scale Archaeological Landscape Analysis 基于激光雷达的数字高程模型自动预处理用于大规模考古景观分析的潜力和意义
IF 0.4 Pub Date : 2022-12-01 DOI: 10.2478/sjce-2022-0022
D. Novak, Filip Pruzinec, T. Lieskovský
Abstract LiDAR-derived digital elevation models (DEMs) have transformed the archaeological study of landscape features, broadened our technical capabilities, and enhanced the accuracy with which terrain relief is described. These models also place demands on how researchers and analysts interpret DEM content in the context of the modern landscape. LiDAR-based DEMs contain modern man-made structures that can significantly influence model properties. Although data are usually filtered and some of these artificial features are removed during bare-earth classification, many terrain interventions remain visible. This large-scale case study applies established methods to a freely available DEM of the Czech Republic in an attempt to evaluate differences between original and filtered DEMs. It applies a fully automated filtering procedure using vector topographic maps to avoid manual corrections that would make the procedure problematic when used on a macro scale. The results of our archaeological GIS analysis demonstrate that this procedure, despite its relative simplicity, can achieve a significantly better representation of a landscape compared to that offered by an unfiltered DEM. Finally, we propose a series of future steps with a view to developing a more comprehensive and accurate model and overcoming its limitations.
摘要激光雷达衍生的数字高程模型(DEM)改变了景观特征的考古研究,拓宽了我们的技术能力,并提高了描述地形起伏的准确性。这些模型还要求研究人员和分析人员如何在现代景观的背景下解释DEM内容。基于激光雷达的DEM包含现代人造结构,可以显著影响模型特性。尽管在裸土分类过程中通常会对数据进行过滤,并去除其中一些人工特征,但许多地形干预措施仍然可见。这项大规模案例研究将既定方法应用于捷克共和国免费提供的DEM,试图评估原始DEM和过滤DEM之间的差异。它使用矢量地形图应用全自动过滤程序,以避免在宏观尺度上使用时会使程序出现问题的手动校正。我们的考古GIS分析结果表明,尽管该程序相对简单,但与未经过滤的DEM相比,它可以实现更好的景观表现。最后,我们提出了一系列未来步骤,以期开发一个更全面、更准确的模型并克服其局限性。
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引用次数: 0
期刊
Slovak Journal of Civil Engineering
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