Development of calculation and practice of implementation for berth wall under seismic load

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A retaining wall is a basic enclosing element of hydraulic structures (Figure 1). The author suggests a classical theory for calculating the gravity retaining wall of the berth based on a principle preventing the process of liquefaction of structurally unstable sandy soils under seismic load. The dynamic stability of the soil structure during the liquefaction process is estimated using a coefficient of cyclic loading, which links the dynamic stresses under seismic action and static stresses in the soils of the base. A higher dynamic stability of the soil structure during the liquefaction process can be effectively achieved by increasing the density of the soil composition. In addition, the author suggests considering the decreasing angle of internal friction of the soil against the rear surface of the retaining wall during seismic action, depending on the earthquake intensity. The paper presents the calculations of gravity retaining walls for seismic load on the soils of the natural foundation base and pile foundation. The calculations were made for various types of retaining walls, a reinforced concrete corner wall with a front console and a massive reinforced concrete wall. The calculations consider a wide range of dimensions of retaining walls and characteristics of backfill soils comprising sandy soils on weak clay soils of the base. In order to achieve the required soil density, which excludes the process of liquefaction of sandy soil structure, the author proposes his own effective methods of dynamic consolidation of sandy soils with shock, explosive and vibration effects.

21st International Conference on Soil Mechanics and Geotechnical Engineering (Vienna)

TC203