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Lutzky Associates Development. LP - Geotechnical Investigalion <br />MACTEC Project 4953-03-2631 <br />September 18.2003 <br />6.10 SHORING <br />General <br />Where there is not sufficient space for sloped embankments, temporary shoring will be required. <br />One method of shoring would consist of steel soldier piles placed in drilled holes, backfilled with <br />concrete. For the expected depth of excavation for this project, cantilever shoring may be <br />sufficient. <br />The following information on the design and installation of the shoring system is as complete as <br />possible at this time. In the event excavations are planned to be deeper than about 15 feet, we <br />should be contacted so that we can provide additional recommendations. <br />Lateral Pressures <br />For retained soil heights of up to about 15 feet, cantilevered shoring may be used. For design of <br />cantilevered shoring, a triangular distribution of lateral earth pressure may be used. It may be <br />assumed that the retained soils with a level surface behind the cantilevered shoring will exert a <br />lateral pressure equal to that developed by a fluid with a density of 30 pounds per cubic foot. <br />Design of Soldier Piles <br />For the design of soldier piles spaced at least two diameters on centers, the allowable lateral <br />bearing value (passive value) of the soils below the level of excavation may be assumed to be <br />600 pounds per square foot per foot of depth from the excavated surface and up to a maximum <br />of 6,000 pounds per square foot. To develop the full lateral value, provisions should be taken to <br />assure firm contact between the soldier piles and the undisturbed soils. The concrete placed in the <br />soldier pile excavations may be a lean-mix concrete. However, the concrete used in that portion of <br />the soldier pile which is below the planned excavated level should be of sufficient strength to <br />adequately transfer the imposed loads to the surrounding soils. <br />Lagging <br />Continuous lagging will be required between the soldier piles. The soldier piles should be <br />designed for the full anticipated lateral pressure. However, the pressure on the lagging will be less <br />29