Abstract
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.
Highlights
The abruptly changing pressure movement of groundwater under a hydraulic structure causes a number of negative phenomena that must be taken into account both in the design and in the operation of pressure hydraulic structures
The conducted graphs prove that the filtration rate in the structure tailwater decreases sharply with an increase in the sheet pile depth
The process nature does not depend on the soil type of the structure base
Summary
The abruptly changing pressure movement of groundwater under a hydraulic structure causes a number of negative phenomena that must be taken into account both in the design and in the operation of pressure hydraulic structures. The factors influencing the intensity of the suffusion processes are investigated in the paper In this case, the liquid pressure movement in a flat section of the structure is considered. The well-known Laplace equation can be obtained after differentiating the first two equations and substituting the results into the last [1] It represents the dependence of the fluid pressure in the filtration zone on the calculation point coordinates in differential form. Two types of boundary conditions were considered in the calculations: Dirichlet conditions, according to which the pressure value was set on the bottom line in the headwater and tailwater; Neumann conditions, according to which the filtration area and the structure contours bounded by the design grid were considered impenetrable
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