Results of full-scale and laboratory studies of the spillway of HPP No. 2

Ulmas Khusankhudzaev,Odil Kadirov,Azizjon Jakhonov,D Bazarov

doi:10.1051/e3sconf/202126403028

Abstract

In the article, based on the results of field measurements and calculations, recommendations are given for determining the roughness coefficient of the channel of the spillway. Based on the analysis of the literature and field research data, it was recommended to take the roughness coefficient of the channel of the spillway (canal) equal to n = 0.02 - for areas with steep slopes and without sediment deposits, and in areas with the worst condition of concrete surfaces and sediment deposits, take n = 0.0225. According to the results of field surveys of the canal, it was found that the hydraulic regime at the turning section No. 2 in the plan is characterized by an uneven distribution of depths in its cross-sections. This is due to the curvilinearity of the turning section of the channel, which has an unacceptably small radius of curvature in the plan causing centrifugal forces and rising levels along the concave wall, which led to an overflow of water over the top of the channel walls. As a result of the conducted experimental - laboratory studies of the turning section of the outflow tract (channel), recommendations are given for reducing the water incursion on the banks, the height of the walls.

Highlights

In hydraulic construction, both abroad and the Republic of Uzbekistan, such urgent problems of our time as the observed decrease in the reliability and safety of the operation of hydraulic structures and their elements have come to the fore
There is an urgent need for research aimed at the development and implementation of modern technological elements of hydraulic structures, ensuring their trouble-free operation and ensuring their safety requirements
Large-scale measures are being taken in the Republic of Uzbekistan to improve the design of hydraulic structures, ensure their reliable and safe operation, improve the throughput and operating mode of spillway structures, and improve their effective mechanisms of work

Summary

Introduction

In hydraulic construction, both abroad and the Republic of Uzbekistan, such urgent problems of our time as the observed decrease in the reliability and safety of the operation of hydraulic structures and their elements have come to the fore. There is an urgent need for research aimed at the development and implementation of modern technological elements of hydraulic structures, ensuring their trouble-free operation and ensuring their safety requirements. This is especially true for hydroelectric facilities in long-term operation, of the order of 20-40 years or more. The channel (channel) outlet section with a total length of 1221.0 m is concreted, of the trapezoidal cross-section with variable width along the bottom b = 6–27 m and slope setting coefficients t = 0–2. The slope of the channel bottom along the route is variable and varies within J1 = 0.0248 - 0.0091 (in the initial section) J2 = 0.00725 + 0 (in the rest). One railway and two road bridges cross the canal route within its length

Materials and Methods

Experimental - laboratory studies of the turning section of the outflow tract

Conclusionss