scholarly journals Numerical simulation of the filtration process in the right-bank of the river Don for protection the buildings against rise of groundwater in the city of Rostov-on-Don

2019 ◽  
Author(s):  
А.В. Гридневский
Keyword(s):  
Numerical Simulation ◽  
Boundary Conditions ◽  
Soil Mass ◽  
Geological Structure ◽  
Hydrogeological Model ◽  
Valley Slope ◽  
Hydrogeological Parameters ◽  
Geological Conditions ◽  
The Right ◽  
The City

Строительство на правобережье реки Дон в г. Ростове-на-Дону сопряжено с риском подтопления и высачивания подземных вод. Для обеспечения гидрогеологических прогнозов разработана численная гидрогеологическая модель склона речной долины. Она характеризует геологическую структуру, граничные условия подземного потока и параметры водопроницаемости грунтов. Идентификация гидрогеологических параметров и интенсивности влияния граничных условий выполнены методом многовариантного численного моделирования. Оценены притоки воды к дренажным сооружениям их зависимость от техногенной инфильтрации. Определены параметры неглубоко залегающих скифских глин, при которых они способствуют локальному подъему уровня подземных вод. В статье анализируются гидродинамические процессы в приустьевой части реки Темерник правобережья Дона с целью детализации представлений о гидрогеологической структуре массива грунтов, оценки параметров фильтрации и граничных условий. Полученные результаты использованы для определения водопритока в зоне высачивания к дренажным сооружениям, сопровождающим строительство. Применяемый подход основан на численном гидрогеологическом моделировании, системно учитывающем параметры геофильтрации в их взаимосвязи. Он позволяет учесть факторы геоэкологического риска для разработки эффективных решений в борьбе с подтоплением. Самыми древними отложениями, определяющими инженерно-геологические условия города, являются морские глины нижне-сарматского яруса (N1s1) мощностью 10–15 м, служащие региональным водоупором. Глины перекрыты комплексом (15÷20 м) водопроницаемых трещиноватых известняков сарматского яруса (N1s2), переслаивающихся известняков и песков мэотического (N1m) и понтического ярусов (N1p). Завершается  толща красно-бурыми плотными отложениями (5÷15 м) скифских глин (QЕsk). Строительство в зоне высачивания создает подпор подземных вод и порождает риск ухудшения геотехнических условий эксплуатации зданий и сооружений: подтопление заглубленных конструкций, смещение по склону  водонасыщенного песчано-глинистого грунта. Construction on the right bank of the river of Don in Rostov-on-Don is associated with a risk of flooding and seepage. To provide hydrogeological forecasts, a numerical hydrogeological model of the river valley slope has been developed. It characterizes the geological structure, the boundary conditions of the underground flow, and the parameters of the permeability of the soils. The identification of hydrogeological parameters and the intensity of the influence of boundary conditions are performed by the method of multivariate numerical simulation. Inflows of water to drainage structures are estimated, their dependence on man-caused infiltration. According to calculations, shallow-lying Scythian clays provide a local rise of the groundwater level. The article analyzes the hydrodynamic processes in the mouth of the Temernik river on the right bank of the Don with the aim of detailing the hydrogeological structure of the soil mass and estimating filtration parameters and boundary conditions. The obtained results were used to determine the water inflow in the seepage area to the drainage facilities accompanying the construction. The mentioned approach is based on numerical hydrogeological modeling, systematically taking into account the parameters of geological filtration in their relationship. It allows taking into account the factors of geoecological risk for the development of effective solutions to protect against flooding. The oldest sediments that determine the engineering and geological conditions of the city are the sea clays of the Lower Sarmatian layer (N1s1) with a thickness of 10–15 m, serving as a regional aquifer. Clays are covered with a complex (15–20 m) of permeable fractured limestones of the Sarmatian layer (N1s2), interbedded limestones and sands of the Meotian (N1m) and Pontian layers (N1p). The stratum ends with red-brown dense sediments (5–15 m) of Scythian clays (QЕsk). Construction in the outflow zone creates a groundwater ascent and generates the risk of deterioration of the geotechnical conditions for the operation of buildings and structures: flooding of buried structures, displacement along the slope of water-saturated sandy-clay soil.

scholarly journals Numerical simulation of natural convection in an inclined porous cavity under time-periodic boundary conditions with a partially active thermal side wall

RSC Advances ◽  
2017 ◽  
Vol 7 (28) ◽  
pp. 17519-17530 ◽  
Author(s):  
Feng Wu ◽  
Gang Wang
Keyword(s):  
Numerical Simulation ◽  
Natural Convection ◽  
Boundary Conditions ◽  
Periodic Boundary ◽  
Side Wall ◽  
Periodic Boundary Conditions ◽  
Porous Cavity ◽  
Thermal Boundary Conditions ◽  
The Right ◽  
Time Periodic

Natural convection in an inclined porous cavity with positively or negatively inclined angles is studied numerically for time-periodic boundary conditions on the left side wall and partially active thermal boundary conditions on the right wall.

Numerical Simulation Study on Three-Dimensional Seepage Field of Deep Excavation Dewatering in Thick Aquifer

2013 ◽  
Vol 353-356 ◽  
pp. 1305-1309
Author(s):  
Yan Jun Liu ◽  
Li Zhen Shen
Keyword(s):  
Numerical Simulation ◽  
Simulation Study ◽  
Three Dimensional ◽  
Pumping Test ◽  
Calculation Model ◽  
Test Results ◽  
Deep Excavation ◽  
Test Procedures ◽  
Hydrogeological Parameters ◽  
Geological Conditions

This article describes the pumping test procedures and test results of the subway project 30m deep excavation dewatering in thick aquifer. A groundwater three-dimensional seepage numerical calculation model is established. We use the model to calculate and compare the calculated results and the actual results, obtain hydrogeological parameters by inversion. Further, we have a numerical simulation study on deep excavation dewatering with the hydrogeological parameters, the Simulation results and excavation pre-dewatering test results are consistent. Test results show that the model can reflect the deep excavation dewatering process with complex geological conditions.

Numerical Analysis on the Subgrade Settlements in Case of Different Tunneling Excavation Plans across Railway

2014 ◽  
Vol 488-489 ◽  
pp. 424-428
Author(s):  
Ming Xin Zheng ◽  
Yang Qiang Chen ◽  
Yang Lin Ou
Keyword(s):  
Numerical Simulation ◽  
Rapid Development ◽  
Ground Surface ◽  
Water Tunnel ◽  
Engineering Project ◽  
Railway Line ◽  
Geological Conditions ◽  
The One ◽  
The Right ◽  
Engineering Projects

Taking the draw water tunnel of the Jiulong river across railway in Fujian province as the research object,the influence of the subgrade settlement of Yingtan-Xiamen double railway and Xiamen-Shenzhen high-speed railway as a result of the double draw water tunnel excavation is analyzed by FLAC3D. Through numerical simulation the condition of whether the subgrade is reinforcement and whether have train load on the subgrade, the result of subgrade settlement in both single tunnel perforation and double tunnel perforation is derived. It shows that: the position of maximum settlement is just above the tunnel centerline, the proportion of subgrade settlement caused by the right line excavation is 67.5% and the one caused by the left line excavation is 32.5% when subgrade is unreinforced and there is no train load; the proportion of subgrade settlement caused by the right line excavation is 60% and the one caused by the left line excavation is 40% when subgrade is reinforced but there is no train load. The proportion of subgrade settlement caused by the right line excavation is 63% and the one caused by the left line excavation is 37% when subgrade is reinforced and there is train load. The results fit well with monitoring data and can be used as a reference for similar engineering projects. Currently, with the rapid development of China's economic, the situation of other engineering projects crossing the existing railway line has been increasing. Most researchers is carried out through the way of on-site monitoring to analyze deformation of ground surface and the railway embankment, and then comes up with the safety assessment and displacement control measures of the tunnel construction[. The common methods of ground surface deformation analysis and prediction contain empirical formula, model test and numerical simulation[. There are a lot of numerical simulation achievements for new construction crossing the existing railway[3-, which mainly focused on the embankment settlement for single or multiple tunnel beneath a single railway line. Based on previous studies, this paper analyzes the railway embankment settlement under the condition whether there is reinforced roadbed or not, and whether the two-lane tunnel crosses many railway line with a combination of train load conditions through the method of three-dimensional model, and compares with the measured data to verify the reliability of numerical simulation. 1 Engineering project and its engineering geological conditions

STUDIES OF GEOLOGICAL CONDITIONS AND THE ASSESSMENT OF AQUIFER PROPERTIES FOR THE MODEL STUDIES OF GROUNDWATER FLOW IN THE GRUDZIĄDZ AREA

2018 ◽  
Vol 471 ◽  
pp. 51-60
Author(s):  
Izabela JAMORSKA ◽  
Arkadiusz KRAWIEC ◽  
Marek MARCINIAK
Keyword(s):  
Negative Impact ◽  
Field Work ◽  
Office Work ◽  
Hydrogeological Model ◽  
Model Studies ◽  
Hydrogeological Parameters ◽  
Efficiency Assessment ◽  
Geological Conditions ◽  
Observation Wells ◽  
Intake Water

The paper presents the results of a preliminary study of geology and hydrogeological conditions of a Grudziądz groundwater intake. The focus of the study was to develop a conceptual model that will be used in further investigation to create a hydrogeological model. In the intake area two multi-aquifer formations have been distinguished: Quaternary and Paleocene-Cretaceous. The Quartenary multi-aquifer formation, which consists of two aquifers separated by poorly permeable rocks, is primary utility. Groundwater in the Paleocene-Cretaceous aquifer has an elevated mineral content, which makes it not usable. The intake is located near Grudziądz and areas of intense farming, which leads to a hazard of anthropopressure, and may have a negative impact on the groundwater quality and quantity. In-office work conducted for the preparation of article included gathering and description of archival data from over 120 years of intake existence. Data from 53 hydrogeological boreholes have been analyzed. In 2017, field work was also conducted, including several measurements of water table in wells and piezometers of the intake. Water samples have also been collected for chemical analyses. An efficiency assessment of some observation wells has been made, establishing their hydrogeological parameters using the PARAMEX method.

The simulation of groundwater spatiotemporal changes under the uncertainty of hydrogeological conditions

2021 ◽  
Author(s):  
Huan-Sheng Lin ◽  
Yuan-Chien Lin
Keyword(s):  
Groundwater Flow ◽  
Local Governments ◽  
Groundwater Resources ◽  
Observation Data ◽  
Hydrogeological Model ◽  
Groundwater Simulation ◽  
Hydrogeological Parameters ◽  
Geological Conditions ◽  
Freshwater Resource ◽  
Spatiotemporal Changes

<p>Groundwater is a reliable freshwater resource in many areas, and it is also an important source of backup water during the drought. Therefore, understanding the characteristics of groundwater resources is crucial and can be explored by building correct hydrogeological models for simulation. To build a perfect hydrogeological model, it is necessary to grasp the correct geological conditions and hydrogeological parameters to establish an effective numerical simulation of groundwater flow. However, geological conditions always contain some uncertainties, which may cause a certain impact on the spatiotemporal changes of groundwater.</p><p>Therefore, this study uses the groundwater flow numerical model, MODFLOW, to build the groundwater simulation model. The ideal case and real case at Touqiao Minshiung Industrial Zone in Chiayi is built from 2009 to 2013. The results show that under different hydrogeological parameters, geology, and other conditions, groundwater will have different patterns of variation. The Empirical Orthogonal Function (EOF) method is also used to compare the dominated patterns. The simulation results show the R<sup>2</sup> can all reach 0.9 compare with the groundwater real observation data. This study can further explore the drought-resistant availability of groundwater in various regions under different geological conditions, it will help relevant agencies and local governments to better manage groundwater resources.</p><p>Keywords: groundwater simulation, MODFLOW, uncertainty, hydrogeology, EOF</p><p> </p><p>__________________</p><p>*Department of Civil Engineering, National Central University</p>

scholarly journals NOISE PROTECTIVE SCREENS AS MEANS OF OPTIMIZATION OF NOISE MODE

2021 ◽  
Vol 1 (161) ◽  
pp. 296-300
Author(s):  
V. Abrakitov ◽  
O. Skrypnyk ◽  
S. Nesterenko
Keyword(s):  
Boundary Conditions ◽  
Mirror Symmetry ◽  
Multiple Reflection ◽  
Geometric Construction ◽  
Sound Beam ◽  
Additional Correction ◽  
Geometrical Form ◽  
The Right ◽  
The City

One of factors that negatively influence on an environment is noise. Noise can negatively influence on a health man. Determination of effective measures of noise rotection of workplaces became the aim of our researches. Certainly, that the most more showy measure are the so-called screens. It is significant, it is the most effective entrance of the city. They became the theme of our research. By us were the studied systems of classifications of screens. They are divided depending on such parameters: on the method of action; after a geometrical form; after an outline in a plan; after the method of arranging, on material. Defining advantages or lacks of the two following charts is impossible (id est there is not sense). They are accepted as given. Consideration of frequent is carried out from the source of noise, that it is located in a narrow corridor between an abat-voix and other obstacle. For simplification it is possible to accept the location of source of noise directly on the surface of soil: the point of source of noise is successfully approximated by a location directly on the surface of soil; distance between this surface and very had an actual mestome to the locations, easily yields to the calculation, i always can be a little rather entered in a calculation as an insignificant additional correction. If we consider reflections not from the left, but from the right screen, absolutely adequate formulas can be derived, in which (taking into account the mirror symmetry of geometric construction), the corresponding indexes are simply replaced... At some stage, the multiple reflection stops. This happens when the height of one of the reflection points exaggerates the height of one of the screens. The sound beam has nothing more to reflect, and it enters the space (to the sky). Therefore, when describing each reflection, we provide boundary conditions for its happening. A voice ray falls on a screen, and reflected from a that screen under the same corner q. It is suggested to "delete" a voice ray by us, directing him to sky above an oppositely stand-up screen after the first beating back.

scholarly journals Numerical Simulation and Reinforcing Technology Research on Collapse of Weak Interlayer Shaft

2019 ◽  
Vol 3 (5) ◽  
Author(s):  
Youzhong Lu
Keyword(s):  
Numerical Simulation ◽  
Three Dimensional ◽  
Loose Body ◽  
Geological Structure ◽  
Simulation Software ◽  
Mechanical State ◽  
Technology Research ◽  
Geological Conditions ◽  
Weak Interlayer ◽  
Comprehensive Processing

The three-level shaft of the mixed pit shaft of Yixin Mine, built in 1983, failed continuously due to the influence of geological structure and the effect of water, which formed a collapsed space with a length of 18m,a depth of 12m,and a height of 12m at the level of -255m and to the southwest end. The 54m pit shaft below the -258m elevation of the pit shaft was filled with collapsed rocks forming a large loose body. The comprehensive processing plan for falling grouting and anchoring was proposed according to the geological conditions of the vertical shaft of the mixed pit shaft, adopting three-dimensional numerical simulation software as well as calculating the mechanical state of the vertical pit shaft surrounding rocks and using 3 to 5 parameters of Williams-Warnke failure criterion.

Art, Idleness and Food: The Ethics of War Communism and the Origins of Production Art, 1918–1919

2019 ◽  
Vol 29 (1) ◽  
pp. 273-287
Keyword(s):  
Theory And Practice ◽  
State Institutions ◽  
Early Production ◽  
Policy Measures ◽  
Soviet Ideology ◽  
The Right ◽  
The Impact ◽  
The City ◽  
Further Development ◽  
Theory Of Production

The article examines the impact of the discourses concerning idleness and food on the formation of “production art” in the socio-political context of revolutionary Petrograd. The author argues that the development of the theory and practice of this early productionism was closely related to the larger political, social and ideological processes in the city. The Futurists, who were in the epicenter of Petrograd politics during the Civil War (1918–1921), were well acquainted with both of the discourses mentioned, and they contrasted the idleness of the old art with the dedicated labor of the “artist-proletarians” whom they valued as highly as people in the “traditional” working professions. And the search for the “right to exist” became the most important goal in a starving city dominated by the ideology of radical communism. The author departs from the prevailing approach in the literature, which links the artistic thought of the Futurists to Soviet ideology in its abstract, generalized form, and instead elucidates ideological influences in order to consider the early production texts in their immediate social and political contexts. The article shows that the basic concepts of production art (“artist-proletarian,” “creative labor,” etc.) were part of the mainstream trends in the politics of “red Petrograd.” The Futurists borrowed the popular notion of the “commune” for the title of their main newspaper but also worked with the Committees of the Rural Poor and with the state institutions for procurement and distribution. They took an active part in the Fine Art Department of Narkompros (People’s Commissariat of Education). The theory of production art was created under these conditions. The individualistic protest and “aesthetic terror” of pre-revolutionary Futurism had to be reconsidered, and new state policy measures were based on them. The harsh socio-economic context of war communism prompted artists to rethink their own role in the “impending commune.” Further development of these ideas led to the Constructivist movement and strongly influenced the extremely diverse trends within the “left art” of the 1920s.

A utopia do direito à cidade: Possibilidades de superação da dicotomia favela-bairro no Rio de Janeiro

GEOgraphia ◽  
2010 ◽  
Vol 7 (14) ◽  
Author(s):  
Márcio Piñon de Oliveira
Keyword(s):  
Rio De Janeiro ◽  
The Other ◽  
Right To The City ◽  
Other Hand ◽  
The Right ◽  
The City

A utopia do direito à cidade,  no  caso específico do Rio de Janeiro, começa, obrigatoriamente, pela  superação da visão dicotômica favela-cidade. Para isso, é preciso que os moradores da favela possam sentir-se tão cidadãos quanto os que têm moradias fora das favelas. A utopia do direito à cidade tem de levar a favela a própria utopia da cidade. Uma cidade que não se fragmente em oposições asfalto-favela, norte-sul, praia-subúrbio e onde todos tenham direito ao(s) seu(s) centro(s). Oposições que expressam muito mais do que diferenças de  localização e que  se apresentam recheadas de  segregação, estereótipos e  ideologias. Por outro  lado, o direito a cidade, como possibilidade histórica, não pode ser pensado exclusivamente a partir da  favela. Mas as populações  que aí habitam guardam uma contribuição inestimável para  a  construção prática  desse direito. Isso porque,  das  experiências vividas, emergem aprendizados e frutificam esperanças e soluções. Para que a favela seja pólo de um desejo que impulsione a busca do direito a cidade, é necessário que ela  se  pense como  parte da história da própria cidade  e sua transformação  em metrópole.Abstract The right  to the city's  utopy  specifically  in Rio de Janeiro, begins by surpassing  the dichotomy approach between favela and the city. For this purpose, it is necessary, for the favela dwellers, the feeling of citizens as well as those with home outside the favelas. The right to the city's utopy must bring to the favela  the utopy to the city in itself- a non-fragmented city in terms of oppositions like "asphalt"-favela, north-south, beach-suburb and where everybody has right to their center(s). These oppositions express much more the differences of location and present  themselves full of segregation, stereotypes and ideologies. On  the other  hand, the right to  the city, as historical possibility, can not be thought  just from the favela. People that live there have a contribution for a practical construction of this right. 

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