At-Rest Earth Pressure Sample Clauses

At-Rest Earth Pressure. Used for rigid walls (e.g., reinforced concrete walls) that deflect less than that indicated in Table 1. Table 1 - When to Use At-Rest Earth Pressure Type of Backfill Wall Deflection / Wall Height Dense sand 0.001 Medium dense sand 0.002 Loose sand 0.004 Compacted Silt 0.002 Compacted lean clay 0.010 Compacted fat clay 0.010 (Xxxxxx & Xxxxxx, 1991) • At-Rest earth pressure shall also be used for walls that are restrained above the dredge line by braces/tiebacks and are backfilled with compacted fill. See also Section 3.8j.ii. • At-Rest earth pressure shall be calculated as follows: Level Ground 𝜎0𝐻 = 𝐾0 𝛾 𝑧 , 𝑤ℎ𝑒𝑟𝑒 𝐾0 = (1 − 𝑠𝑖𝑛𝜙′)𝑂𝐶𝑅(𝑠𝑖𝑛𝜙′) Sloping Backslope Where: 𝜎0𝐻 = 𝐾0 𝛾 𝑧 (1 + s𝑖𝑛 𝛽) σ0H – Horizontal At-Rest Earth Pressure (lbf/ft2) K0 – At-Rest Earth Pressure Coefficient ϕ’ – Effective Friction Angle (deg) OCR – Over-Consolidation Ratio β – Backslope Angle (deg)