Ground Movement Analysis of Earth Support System

Ground movements associated with a new insitu earth reinforcement lateral support system are analyzed using a two-dimensional plane strain finite element technique specially developed for reinforced soil and soil-structure interaction problems. Incremental construction and nonlinear soil characterization are included. The calculated ground movements are represented in terms of angular and lateral distortions. These were selected as indications of potential building damage ajacent to an open excavation. Typical design charts of angular and lateral distortions in relation to the depth of excavation and reinforcement length are presented. The system described in this paper is unique and in many instances offers a better choice over the conventional temporary earth support systems currently being used. The working stress analysis when coupled with the limit analysis calculation provide not only an adequate design of the system, but also information concerning ground movements critical to building damage adjacent to open cuts.