The article deals with the dam site shape effect produced on values of displacements in the perimeter joint of the 100 m high rockfill dam having a reinforced concrete face. Six alternative options of the dam site were considered: 3 sites having trapezoidal shape and 3 sites having triangular shape. The options also differ in slopes of rock sides (1:2, 1:5, 1:1). Displacements in a perimeter joint were identified based on the analyses of stress-strain states of rockfill dams, completed using the method of contact finite element to model the behaviour of joints. According to the author’s findings, displacements in the perimeter joint occur in three directions: the opening, the outline deflection of the face and the longitudinal displacement of the face. In the course of the modeling process, the perimeter joint opened in all six options, because horizontal displacements of the face (in the direction along the river channel) turned to be approximately equal to its settlement. In case of narrow (triangular) sites, the maximal opening of the joint occurs on the rock sides. In case of wide sites, opening at low levels increases to a considerable extent; large openings are observed not only on dam sides, but in the river channel, as well. An opening of the perimeter joint means reduction of values of tensile forces on the face. If the perimeter joint opens, the face is free to move in other directions. Deflections may reach large values, especially if the dam site is wide and has steep rock sides. Deflections reach maximum values in the points, where the reinforced concrete face demonstrates its maximum deflection. The studies prove that the width of the dam part in the river channel has the major effect on values of displacements in the perimeter joint.

Приведен анализ влияния формы створа на величины перемещений в периметральном шве каменной плотины с железобетонным экраном высотой 100 м. Рассмотрено 6 вариантов створов с разными шириной русловой части створа и наклоном бортов. Перемещения в периметральном шве были получены с помощью вычислительной программы, которая позволяет моделировать работу швов с помощью контактных конечных элементов. Установлено, что в периметральном шве перемещения происходят в трех направлениях: раскрытия, контурные прогибы и продольные смещения экрана. Во всех вариантах произошло раскрытие периметрального шва. Исследования показали, что наибольшее влияние на величину перемещений в периметральном шве оказывает ширина русловой части плотины.