Testing device for measuring hydrodynamic gap pressure of bottom plates of plunge pool

Abstract

The invention discloses a testing device for measuring the hydrodynamic gap pressure of bottom plates of a plunge pool. The testing device comprises the plunge pool and pressure sensors, wherein the plunge pool comprises a box, a testing section and non-testing sections; the box can move along the direction of water flow; the testing section is arranged at the bottom of the box; according to the non-testing section, transverse seams are formed in the bottom of the box and between the upstream and downstream ends of the testing section respectively; a lining plate is arranged between the testing section and the bottom of the box; a bottom seam is formed between the lining plate and the testing section; the pressure sensors pass through the lining plate and enter the bottom seam. According to the testing device, a transverse distribution rule of the hydrodynamic gap pressure can be obtained, and a longitudinal distribution rule of the hydrodynamic gap pressure can also be tested; the influence on the hydrodynamic gap pressure caused by water filled from the transverse seams and longitudinal seams is comprehensively considered; the influence on the hydrodynamic gap pressure caused by different sizes of uplift pressure is considered; the hydrodynamic gap pressure of the transverse seams or the longitudinal seams under different extents of water-seal inactivation can be measured; the deformation of concrete bottom plates can be simulated, and the device more accords with actual engineering.

Description

technical field [0001] The invention belongs to the technical field of water conservancy and hydropower engineering, and in particular relates to a test device for measuring the dynamic water pressure in the gap of the bottom plate of a pond. Background technique [0002] The selection and design of flood discharge and energy dissipation methods under high water head and large flow rate is one of the key technologies in the construction of high dams. Flood water is often released through the openings of the dam body, and water cushion ponds are lined downstream of the dam to dissipate excess kinetic energy and prevent the downstream of the dam from being damaged. Scour to ensure the stability of the riverbed and the slopes on both banks. According to the shape of the cross section, the pad pond can be divided into two types: reverse arch and bottom. [0003] The stability of the pad pond depends on the stability of the bottom plate, and the stability of the bottom plate dep...

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Problems solved by technology

[0005] 1. The device designs a test section within the impact area near the impact point of the water tongue in the pool. The test section is arranged with sensors along the transverse direction, which can only analyze the distribution law of the dynamic water pressure in the gap along the horizontal direction, but cannot obtain the distribution of the dynamic water pressure in the gap along the longitudinal direction. In other words, the distribution law of the gap hydrodynamic pressure in the wall jet area upstream and downstream of the impact zone cannot be obtained, while the gap hydrodynamic pressure in the wall jet area is often greater than the surface hydrodynamic pressure, and the floor plate is subjected to a large upward force, which is The main areas of instability and damage in the pad;

[0006] 2. The test section is a reverse-arched arch ring, and the arch ring is not divided into floor plates longitudinally, that is, only transverse joints are set in the upstream and downstream, and no longitudinal joints are set along the direction of water flow. , which is inconsistent with reality;

This device does not consider the influence of uplift pressure on the gap dynamic water pressure during normal flood discharge and energy dissipation of the high dam; it also does not consider the working condition of only uplift pressure under the condition of reservoir maintenance (no water discharge under the tongue and no water in the pool), And when the uplift pressure acts alone, it is also possible to overturn the bottom plate;

[0008] 4. The degree of water-stop damage to the gaps (transverse and longitudinal joints) around the bottom plate determines the size of the water flow poured into the bottom seam of the bottom plate, which will also affect the dynamic water pressure in the gap. The device does not consider the different water-stop damage of the side seams The influence of degree on the crevice hydrodynamic pressure;

[0009] 5. The bottom plate is made of plexiglass. The bottom plate in the experimental device cannot simulate the deformation of the concrete bottom plate in the actual project. It does not meet the Cauchy criterion and cannot consider the deformation of the bottom plate under the action of large impact hydrodynamic pressure. crevice hydrodynamic pressure

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