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St. Barbara Catholic School <br />Project No.: D-6289-01 <br />Design Values <br />Representative values were selected from the test data and other sources <br />tabulated below: <br />Field Density <br />Expansion Index <br />Angle of Internal Friction (Ultimate/Peak) <br />Cohesion (Ultimate/Peak) <br />Modulus of Subgrade Reaction (k) <br />Subgrade R Value <br />Earthquake -Induced Liquefaction Potential <br />CITY OF SANTA ANA <br />Planning and Building Agency <br />may, lS. <br />Approved <br />FOR PERMIT ISSUANCE <br />Master ID: <br />and is <br />120 pcf <br />0 <br />31/32, 32/33, 34/35 deg <br />300/350, 250/300 & 200/250 psf <br />100 pci (upper soil) <br />30 <br />Earthquake -induced vibrations can cause liquefaction mostly in silts and fine sands below <br />the groundwater. Liquefaction results in a complete loss of soil strength and can cause <br />structures to settle or even overturn if it occurs in the bearing zone. If liquefaction occurs <br />beneath sloping ground, phenomena known as lateral spreading can occur. <br />The susceptibility of a soil to undergo liquefaction is dependent upon five basic and <br />interdependent criteria. These criteria are: <br />1. Penetration resistance (the relative soil density). Liquefaction has been shown to <br />be unlikely where the relative density of the soils is greater than seventy (70%) <br />percent. A soil that has relative density of less than seventy (70%) percent, may <br />liquefy depending on a number of factors. <br />2. The water table, perched or otherwise, must be present for liquefaction to occur. <br />Soils above the water table do not liquefy. <br />12 <br />