Operation of pipe water transmission structure in interaction with subsiding soil

Operation of pipe water transmission structure in interaction with subsiding soil

R.Xujakulov,S.Saidov,M.Safarova,B.Boltaboev,T.Roziqov, E.Azimov,M.Abdiyev .

¹Karshi Engineering and Economic Institute, 180100, Kashkadarya, Uzbekistan

E-mail: [e-mail]

Abstract: As is known, in compliance with all the requirements and recommendations of regulatory documents on the design of irrigation systems on subsident soils, deformations of the foundations of structures often significantly exceed the calculated ones, which can cause loss of operational suitability of irrigation structures. The above determines the need for further study of the features of the interaction of irrigation facilities with their subsidence bases. This article is devoted to this problem, in particular, to the study of the influence of stress redistribution in the moistened subsidence bases of tubular hydraulic structures on the stress state of their elements and the stress-strain state of loess subsidence bases of hydraulic structures in the Karshi steppe.


Keywords: humidity, process, deformation, horizontal expansion, flyer, priming, circuit, pressure depth, diameter zone, stamp, border.

1. 
   Introduction
   

The increasing demand for improved irrigation systems in the world requires a more comprehensive and extensive study of the reliability and safety of hydraulic structures. In this regard, increasing the reliability during the operation of hydraulic structures of irrigation systems, and especially on subsident soils, is very important, because loess subsident soils are widespread on the globe, a significant part of loess rocks is located in Central Asia, including in the Republic of Uzbekistan. In these areas, in developed countries, including Australia, Asia, the UK, Europe, the USA, China, Russia, and special attention is paid to the development of effective methods for the design and construction of hydraulic structures.
Worldwide, special attention is paid to the research and development of hydraulic structures in irrigation systems aimed at studying, detecting and preventing damage, failures and accidents. In this regard, it is especially important to create a mechanism to ensure the reliability of irrigation systems and planned preventive maintenance and repair that meets modern requirements of innovative development.
Currently, large-scale measures are being implemented in the country to extend the service life of hydraulic structures on irrigation systems that are built and are being built on loess subsidence soils, to reduce damage from their breakdowns and failures, as well as to develop safety criteria.
A number of scientists, both in the Republic of Uzbekistan and abroad, were engaged in the problem of ensuring the reliability and safety of hydraulic structures of irrigation systems, including: M.A.Bandurin [13], D.R.Bazarov [3-4], M.R.Bakiev[11-12], Yu.S.Vasiliev and others [1], A.B.Veksler, V.A.Volosukhin[22], S.V.Zasov[14], B.D.Kaufman [16], Yu.M.Kosichenko [19], N.N.Frolov [27], and others.
The great importance is the reclamation of loess soils, which are fertile lands and occupy vast territories of the Russian Federation, but are located mainly in the arid regions of Russia, Ukraine and Central Asia, including in the Republic of Uzbekistan. However, the reclamation of these territories presents certain difficulties due to the specifics of the work of hydraulic structures on loess subsidence soils, which consists in the manifestation of significant and uneven deformations when the foundations are moistened.
One of the most important tasks of designing and constructing reclamation network structures on loess subsidence soils is to ensure their long-term trouble-free operation. Improving the methods of designing hydraulic structures on subsidence bases requires further study of very complex physical processes occurring in the foundations of structures during their construction and operation. This is confirmed by the fact that even if all the requirements and recommendations of regulatory documents on the design of irrigation systems on subsident soils are met, deformations of the foundations of structures often significantly exceed the calculated ones, which can cause loss of operational suitability of irrigation structures. Works are devoted to this problem [2], [5-6], [7-10], [14-15], [17-21], [23-26].
The above determines the need for further study of the features of the interaction of irrigation facilities with their subsidence bases, which is the main purpose of the research conducted by the author.