On-site observations of the static behavior of a section of the cellular abutment of the Kanev hydroelectric station

Abstract

The abutments of the Kanevhydroelectric station are of a cellular construction with a precast-monollthic frame [2, 4]~ Cellular constructions are cost effective and technologically efficient in construction works [2], but they have been investigated little with respect to their behavior.The investigated section, which is part of the downstream wing wall of the left-bank abutment of the Kanev hydrostatlon, has a height along the face wall of 26.8 m, length along the face wall of 25 m, and bottom width of 23.75 m. The section consists of 6.8-m square cells arranged in three rows with three in each row. The 1-m-thick face all is monolithic. The 0.5-m-thick walls of the cells are made of precast reinforced-concrete slabs each 3 m high with 0.5-cm horizontal joints between adjacent (with respect to height) slabs. Adjacent slabs located in the same tier are joined by loop projections of the reinforcement sealed at the junctions of the cells (Fig. i). The section has a monolithic reinforced-concrete cellular foundation with a height from 1.5 to 4.5 m with a wall thickness of 1 m. The cells and recesses of the section are filled with sand with compaction. Compaction of the sand in the recesses was carried out layerwise by sheepsfoot rollers. The sand in the cells was compacted after filling each tier by a S-629 hydraulic vibrator inserted into the ground to a depth of 5 m at five points of each cell -in the middle and at the corners.In the foundation of the hydrostation and abutment are fine and medium sands compacted to 7d = 1.7 tons/m 3 and n = 35-37% [3].