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Gri#in Realty SA, inc.-Geotechnical Investigation <br />Iiiw/Crandall Project 70131-7-0261.0001 <br />July 8, 1997 <br />For the design of tied-back or braced shoring, we recommend the use of a trapezoidal distribution <br />of earth pressure. The recommended pressure distribution, for the case where the grade is level <br />behind the shoring, is illustrated in the following diagram with the maximum pressure equal to <br />22H in pounds per square foot, where H is the height of the shoring in feet. (Where a combination <br />of sloped embankment and shoring is used, the pressure would be greater and must be determined <br />for each combination.) <br />u )..i//2 //03 //02 4 //r <br />0.2H <br />O . <br />CO <br />0 <br />M-HEIGHT <br />OF <br />0 <br />0.6H <br />SHORING IN FT. 0 <br />0 <br />0 <br />0 <br />0. 1H <br />0 <br />//A.//A'//£//90//A'//,0//A \|e- 22H -5,| <br />(P.S.F.) <br />In addition to the recommended earth pressure, the upper 10 feet of shoring adjacent to any <br />vehicular traffic areas should be designed to resist a uniform lateral pressure of 100 pounds per <br />square foot, acting as a result of an assumed 300 pounds per square foot surcharge behind the <br />shoring due to vehicular traffic. If the traffic is kept back at least 10 feet from the shoring, the <br />traffic surcharge may be neglected. <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 500 <br />pounds per square foot per foot of depth, up to a maximum of 2,000 pounds per square foot. To <br />develop the full lateral value, provisions should be taken to assure firm contact between the soldier <br />piles and the undisturbed soils. The concrete placed in the soldier pile excavations may be a lean- <br />mix concrete. However, the concrete used in that portion of the soldier pile which is below the <br />9