Analysis of Geological and Hydrogeological Conditions during the Reconstruction of the Embankment of the Izhevsk Reservoir

This article is devoted to the peculiarities of geological and hydrogeological conditions during the development of the Izhevsk Reservoir embankment reconstruction project. The study was carried out on the left bank of the Izhevsk Reservoir (Embankment of architect Dudin), within the boundaries of the embankment from the stairway of the ‘Friendship of Peoples’ monument to the mouth of the Podborenka River and the partially adjacent root slope to Militsionnaya Street with Shirokiy Lane. The filled-in section of the embankment with a width of up to 30 m was previously part of the water area of the reservoir. The area was formed in 2010–2011, mainly by dumping sandy soils up to 5.0 m thick and more, with a sheet pile wall separating the area from the reservoir. The surface of the new embankment is smooth and practically flat, with a slight slope towards the reservoir. The hydrogeological conditions of the area are characterized by the presence of groundwater, identified within the overflow terrace and at the foot of the bedrock slope of the Izh River valley. The water comes to the surface in the form of numerous cesspools and downward-flowing springs at the foot of the slope. Within the study area, four locations of water outlet concentrations are equipped with captage. In the course of the study, a detailed analysis of physical and mechanical properties of soils and corrosivity of groundwater to the basic construction materials was carried out. The result of the study is an assessment of geological and hydrogeological conditions in terms of the structure of occurrence of geological soil layers, physical and mechanical properties of soils, depths and nature of groundwater occurrence, their corrosivity. Measures to preserve and strengthen the slopes, groundwater drainage from the territory of slopes and embankment during reconstruction works are proposed.