scholarly journals The Effect of inclined intermediate Sheet Pile on Seepage Properties Under Hydraulic Structure Using SEEP/W Program

2021 ◽  
Vol 1076 (1) ◽  
pp. 012131
Author(s):  
Ibtihal H. Salim ◽  
Burkan Saeed Othman
Keyword(s):  
Hydraulic Structure ◽  
Sheet Pile ◽  
Seepage Properties

scholarly journals Influence of immersion depth of the sheet pile on the intensity of suffusion processes in pressure hydraulic structures

2021 ◽  
Vol 326 ◽  
pp. 00039
Author(s):  
Iurii Bik ◽  
Vera Degtiareva ◽  
Oksana Pridanova ◽  
Aleksandr Kudriashov ◽  
Ruslan Dubrovin
Keyword(s):  
Hydraulic Structure ◽  
Fluid Motion ◽  
Pressure Head ◽  
Point Of View ◽  
Dirichlet Boundary Conditions ◽  
Immersion Depth ◽  
Pressure Gradients ◽  
Sheet Pile ◽  
Erosion Processes ◽  
Calculation Results

The research examines the influence of constructive features of a pressure hydraulic structure on the intensity of suffusion processes in the tailwater. The equations of non-vortex filtration fluid motion under a hydraulic structure in the form of a sheet pile wall are calculated by the finite element method using the Neumann and Dirichlet boundary conditions. The influence of immersion depth of the sheet pile on the erosion processes in the tailwater is investigated. The possibility of protecting the pressure head structure by creating an apron in the tailwater which prevents soil suffusion is analyzed. Calculations show that the greatest pressure gradients are observed at the sheet pile tip and at the outlet to the tailwater. From the point of view of the suffusion process, the zone at the lower end of the sheet pile is not dangerous; therefore, predictions about the suffusion intensity for a particular structure should be made on the basis of the output gradients at the tailwater border. Calculations show that the constructive features of a pressure hydraulic structure have a significant impact on the processes of suffusion and pile heave. The graphs are based on the calculation results; they clearly demonstrate that the filtration rate in the structure tailwater sharply decreases with an increase in the depth of driving the sheet pile, regardless of the soil type of the structure base. Besides, an additional protective effect is provided by a structure in the apron tailwater.

scholarly journals Influence of Cavity Under Hydraulic Structures on Seepage Characteristics

2018 ◽  
Vol 7 (4.20) ◽  
pp. 461 ◽  
Author(s):  
Asmaa Abdul Jabbar Jamel ◽  
Muataz Ibrahim Ali
Keyword(s):  
Coefficient Of Determination ◽  
Hydraulic Structures ◽  
Structure Model ◽  
Sheet Pile ◽  
Uplift Pressure ◽  
Coefficient Of Permeability ◽  
Seepage Characteristics ◽  
The Stability ◽  
Seepage Properties ◽  
Different Characteristics

Cavities under hydraulic structures have a significant influence on the stability of these structures. This study depends on (SEEP/W) software for a hydraulic structure model with an upstream sheet pile. Thus, different results are obtaining for discharge, uplift pressure and exit gradient. For the output a dimensional analysis is perform to study the effect of these variables. Also (SPSS), where special equations are obtaining for seepage discharge, uplift pressure and exit gradient has a coefficient of determination and correlation (0.9, 0.89, 0.8) respectively. The effect of the presence of the cavities on seepage properties whenever the location of the cavity before the sheet pile increased its effect on the discharge and uplift pressure in contrast to the exit gradient where cavity approaching the end of the structure that is increasing its impact on the exit gradient. Also decrease the depth of the cavity from ground increase its impact on the characteristics of seepage, as well as the greater coefficient of permeability and the diameter of the cavitation will increase seepage properties. Also shows that when comparing the state of the presence of cavity with the absence of it, different behaviors with different characteristics of seepage will appear at different percentage.

scholarly journals The use of deep-laid pits when using precipitation runoff for irrigation in the mountain-piedmont zone

2021 ◽  
Author(s):  
O. G. Degtyareva ◽  
◽  
S. M. Vasilyev ◽  
Keyword(s):  
Agricultural Land ◽  
Hydraulic Structure ◽  
Negative Impact ◽  
Rainfall Runoff ◽  
Sheet Pile ◽  
Soil Movement ◽  
Safety Requirements ◽  
Piedmont Zone ◽  
Software Product ◽  
Pile Model

Purpose: to study the effect of nonlinear soil movement in a deep-laid pit when designing an above-ground reservoir for irrigation as part of a system for regulating the precipitation runoff in the mountain-piedmont zone, subject to the technical regulations on the structure safety and subsequent safe operation. Materials and methods: the construction of a deep-laid pit in difficult geological design conditions in the mountain-piedmont zone of a hydraulic structure, which is responsible in terms of safety, namely, a system for regulating the rainfall runoff for irrigating agricultural land, prompted us to a more detailed study of measures to prevent soil uplift. In the analysis two conditions were modeled, namely, the construction of a deep-laid pit for an above-ground reservoir in the mountain-piedmont zone for irrigation without measures to prevent soil uplift and with appropriate measures. Results and discussion: when analyzing the results of soil uplift calculation without taking additional measures, it is stated that the soil uplift has a negative impact on the reservoir and in this case the hydraulic structure safety is not ensured. As an alternative option, the use of pit sheathing with a Larsen sheet pile model VL606a is considered. As a result of numerical modeling using the MIDAS software product, which made it possible to take into account all the factors necessary for solving such problems, it was found that the indicators are included in the confidence zone and, as a result, this structure will meet all safety requirements. Conclusions: when constructing a deep-laid pit without additional measures, the soil uplift is 52.5 cm, and when arranging additional measures in the form of a sheet pile – 1.97 cm, which must be taken into account when designing an above ground reservoir for irrigation as part of a system for regulating the precipitation runoff in a mountain-piedmont zone.

METHODS OF FORECAST CALCULATION OF GROUND WATER BACKWATER IN THE ZONE OF HYDRAULIC STRUCTURES INFLUENCE

2020 ◽  
pp. 109-116
Author(s):  
N.P. KARPENKO ◽  
◽  
M.A. SHIRYAEVA
Keyword(s):  
Numerical Model ◽  
Computer Program ◽  
Ground Water ◽  
Programming Language ◽  
Hydraulic Structure ◽  
Hydraulic Structures ◽  
Software Model ◽  
Computational Program ◽  
Specific Object ◽  
Zone Of Influence

The purpose of the work is to consider methods for calculating the forecast of groundwater backwater in the zone of influence of hydraulic structures. The analysis of analytical dependences of calculation of the forecast of groundwater backwater for various calculation schemes is carried out. For a homogeneous scheme of the geofiltration structure, a numerical model is proposed and a computational program for calculating the groundwater backwater is developed. It allows calculating the groundwater backwater from the channel at any time in the discrete mode. To simplify the solution of the problem of calculating the groundwater backwater, a computer program was created in the programming language Phyton Version 8.3 which quickly solves this hydrogeological problem. A possible range of geofiltration parameters is proposed for calculating the groundwater backwater near main channels. The adaptation and implementation of the software model was carried out for a specific object – the Bolshoy Stavropol channel-5, for which forecast calculations were made. The results of predictive calculations of groundwater backwater are the basis for the assessment of areas of possible flooding – the territory within which the level of ground water increases as a result of their backup by a hydraulic structure.

The Effect of Cutoffs on the Uplift Pressure Beneath the Hydraulic Structures Floor

2018 ◽  
Vol 6 (3) ◽  
pp. 20-28
Author(s):  
Faisal Al Tabatabaie ◽  
Dhabia Sabeeh Al Waily
Keyword(s):  
Potential Energy ◽  
Hydraulic Structure ◽  
Hydraulic Structures ◽  
Outer Face ◽  
Analogue Model ◽  
Electrical Analogue ◽  
Uplift Pressure ◽  
Different Depths ◽  
The Stability ◽  
Critical Sections

The use of cutoffs underneath the hydraulic structures is considered a safe solution to ensure the stability of hydraulic structure against uplift pressure and piping phenomenon in addition to the sliding and overturning forces of the water. These cutoffs are used at critical sections underneath the floor of hydraulic structure to substitute with their depths the horizontal lengths of the creep line of the hydraulic structure base. In this paper, the experimental method- by using electrical analogue model- was carried out to plot the flow net and study the efficiency of the front and rear faces of the cutoffs for dissipating the potential energy of the percolating water underneath the floor of hydraulic structure. An electrical analogue model which was used in this study consists of twenty five models with different depths of upstream and downstream cutoffs. After plotting the flow net for all models, it is concluded that the efficiency of the inner sides are less than that of the outer sides which were investigated before in this topic of this work that both faces reduction values in the uplift pressure are considered the same, where the efficiency of the outer face of upstream cutoff is (70.35) % and for the inner face is (29.64)%, while for the downstream cutoff the efficiency for the outer face is (76.21)% and for the inner face is (23.79)% .

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