Patent ID: 8721228
Filing Date: 2014-05-13
Classification: E02D

Abstract:
1. A foundation-unit structure of a retaining wall placed on a foundation ground along a slope of a bedrock, the foundation-unit structure comprising: a concave portion formed on the foundation ground, and a grain-sized material layer formed by filling the inside of the concave portion with a grain-sized material, an internal frictional angle of the grain-sized material forming the grain-sized material layer comprising a magnitude equal to or greater than that of an originally used ground material supporting the grain-sized material layer, a block comprising a link body connecting front and back walls of the block, the block being positioned on the grain-sized material layer, a lower portion of a sliding resistive element configured as a plate and being positioned within the grain-sized material layer such that the sliding resistive element opposedly faces the slope of the bedrock at a back side of the sliding resistive element, an upper portion of the sliding resistive element projecting upwardly from the grain-sized material layer between front and rear walls of a respective one of said blocks of a plurality of said blocks adapted to form the retaining wall such that the sliding resistive element is positioned over and between a boundary surface in a vertical direction between the grain-sized material layer of the concave portion and an adjacent block and between said adjacent block and an adjacent successive block, the sliding resistive element being positioned vertically with respect to a respective block such that the sliding resistive element and front and back walls of a respective block are not vertically aligned or contiguous with each other, and a front space and a back space being formed between the upper portion of the sliding resistive element and the front and back walls of the block, the front and the back spaces being filled with a grain-sized material so a to form a front constraining layer and a rear constraining layer so that the front constraining layer and portions of the grain-sized material layer filled in the concave portion formed on the foundation ground below the front constraining layer are integrally formed with each other in the vertical direction, whereby when an earth pressure is applied to a respective block, a passive reaction force is generated at a front surface of the sliding resistive element so as to provide increased sliding resistance of a respective block, the sliding resistive element being slidable with respect to the front and rear walls of a respective block so as to enable said sliding resistance.