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Lutzky Associates Development, LP - Geolechnical Investigation <br />MACTEC Project 4953-03-2631 <br />September 18.2003 <br />6.8 RETAINING WALLS AND WALLS BELOW GRADE <br />Lateral Earth Pressure <br />For design of cantilevered retaining walls, where the surface of the backfill is level, it may be <br />assumed that drained soils will exert a lateral pressure equal to that developed by a Abid with a <br />*nsity of 30 pounds per cubic foot. <br />Walls below grade restrained at the top should be designed to resist a trapezoidal distribution of <br />lateral earth pressure. The recommended pressure distribution for the case where the grade is level <br />behind the wall is illustrated below, with the maximum pressure equal to 22H in pounds per sq lia,e <br />goot, where H is the height of the wall in feet. The recommended earth pressure is calculated <br />assuming that a drainage system will be installed below the walls, so that external water pressure <br />will not develop against the walls. We also recommend that a drainage system be installed in the <br />base-isolator crawl space beneath the base-isolated building to collect any incidental water that <br />may intrude under the building. <br />L <br />O2H <br />0 <br />4 8 <br />-0 <br /><t <br />H=HEIGHT OF <06H <br />a <br />WALL BELOW GRADE IN FT <br />0 <br />a <br />-3- <br />O2H <br />9 / 9 <br />//k//E//A//A//k//A//A ,pe-22 H -D <br />(P S F.) <br />In addition to the recommended earth pressure; retaining walls adjacent to areas subject to <br />vehicular traffic should be designed to resist a uni form lateral pressure of 100 pounds per square <br />¢got, acting as a result of an assumed 300 pounds per.square foot surcharge behind the walls duedo <br />ngrmal vehicular traffic. If the traffic is kept back at least 10 feet from the walls, the traffic <br />surcharge may be neglected. Retaining walls should also be designed to resist any applicable <br />26