IMPACT OF ERRORS IN WATER DRAINAGE SYSTEMS OF HIGHWAYS ON THE MARINE TERRACE GEOSYSTEMS    

S. V. Rybal’chenko^1,* , А. S. Оganezov^2,**

 ¹Special Design Engineering Bureau for Automation of Marine Researches, Far East Branch, Russian Academy of Sciences, ul. Maksima Gor’kogo, 25, Yuzhno-Sakhalinsk, 693000 Russia

²Sakhalin State University, Kommunisticheskii pr., 33, Yuzhno-Sakhalinsk, 693000 Russia

* E-mail: rybalchenko_sv@mail.ru
** E -mail: artusur@mail.ru

Errors in drainage system arrangement at the stage of research, design, construction and operation of highways play a significant role in the intensification of processes that pose threat to the structural integrity of roads and road safety. Unorganized collection and removal of surface water from the roadway lead to the development of denudation, erosion, rheological and mudflow processes in the roadbed body or in a close proximity to it.  Due to the peculiarities of sea terraces (geomorphological, geological and hydrological), the transport and operational characteristics of highways are significantly reduced. On the basis of field observations, the most characteristic defects of road elements located on sea terraces are identified. Two groups of defects in drainage systems have been distinguished: the lack of organized drainage and structural defects of culverts. Defects in drainage systems damage various road units. The mechanism of the negative impact of defects in drainage systems on the structural integrity of transport highways embraces a number of phenomena: stagnation of water on the surface, filtration and pressure of hydrodynamic flows, temporary off-channel flows from the slopes of the subgrade, as well as hazardous exogenous processes in the body of the earth canvas and in the right-of-way. In order to prevent the consequences of defects in drainage systems at the stage of design, construction, reconstruction and operation of highways, it is necessary to meet all the necessary requirements of normative documents in the field of wastewater disposal, as well as to take into account engineering geological, geomorphological and climatic features of the territories of sea coasts, including sea terraces.

Keywords: culverts, subgrade, defects in water disposal systems, dangerous exogenous processes, filtration flows, erosion

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