THE ANALYSIS OF PIPELINE LOADING FEATURES OF WATER SUPPLY AND WASTEWATER DISTRIBUTION SYSTEMS IN THE COASTAL ZONE TO SUBSTANTIATE THEIR CALCULATION METHODS

Abstract

The article discusses the features of loading pipelines of water supply and sanitation systems in seaside cities located in coastal zones. An analysis of the operating conditions of such pipelines on the southern coast of Crimea has shown that accidents related to their destruction often occur as a result of storm impacts. It has been demonstrated that during storms, pipelines are subjected to additional loads, which, depending on their intensity, can lead to destruction and loss of the operational state of water supply and sanitation systems, as well as violate environmental safety requirements in coastal zones. The current regulatory documents do not provide recommendations for calculating pipelines of water supply and sanitation systems located in the coastal zone, which may be exposed to storm effects. To assess the strength of such pipelines, we propose calculation equations for two loading schemes. The calculation of the water supply system pipeline located in the coastal zone of the city of Alushta was performed, and the results were analyzed.

Subject of research. The nature of loading of pipelines of water supply and sanitation systems in the coastal zone, taking into account the impact of wave loads.

Materials and methods. Based on the analysis of loading features, two calculation schemes are proposed, which are encountered in the practice of operation of pipelines of water supply and sanitation systems located in the coastal zone. The first calculation option is when a part of the pipeline is laid directly on the ground, in the second calculation option – the pipeline is located on vertical supports.

Results. It has been established that when the pipeline is located above ground, the span of the supports and the level of wave action have a significant impact on the pipeline's strength. Changing the span between supports leads to an increase in the total stresses in the pipeline to a lesser extent than an increase in the wave load. With the chosen pipe material and the wave load during storms of 7 and 8 points, regardless of the span between supports, the pipeline discussed in the article does not meet the required strength.

Conclusions. When assessing the stability and reliability of water supply and sanitation systems in coastal cities located in coastal zones, it is necessary to take into account the specific features of loading. To ensure the strength and durability of above-ground pipelines in coastal zones, it is necessary to select the span between their supports based on the permissible level of wave load, and to consider these factors when selecting the pipeline material. When pipelines are located above ground in coastal zones, the maximum wave load does not significantly affect their strength, providing sufficient safety margins.