Laserfiche WebLink
• Geotechnical Engineering Report lierracon <br /> Merrill Creek Operations Base Expansion • Everett, Washington <br /> December 14, 2020 • Terracon Project No. 81205012 GeoReport <br /> passes below a 45-degree "cone" extending downwards from the bottom edge of a footing should <br /> be considered to be within that footing's cone of influence, and requires addition evaluation. <br /> Design Parameters <br /> Structures with unbalanced backfill levels on opposite sides should be designed for earth <br /> pressures at least equal to values indicated in the following table. Earth pressures will be <br /> influenced by structural design of the walls, conditions of wall restraint, methods of construction <br /> and/or compaction and the strength of the materials being restrained. The "at-rest" condition <br /> assumes no wall movement and is commonly used for basement walls, loading dock walls, or <br /> other walls restrained at the top. The recommended design lateral earth pressures do not include <br /> a factor of safety and do not provide for hydrostatic pressure on the walls. <br /> For active pressure movemen <br /> S=Surcharge I-(0.002 H to 0.004 H) <br /> S For at-rest pressure <br /> -No Movement Assumed <br /> Horizontal <br /> Finished <br /> Grade <br /> / H <br /> / Horizontal <br /> Finished Grade <br /> II—p2—Il4—p,--0I Retaining Wall <br /> Lateral Earth Pressure Design Parameters <br /> Earth Pressure Coefficient for Backfill Uniform Pressure Effective Fluid <br /> Condition Type pt (psf) Pressures (psf) <br /> At-Rest Li<o) 0.43 (0.43S (58)H <br /> Seismic5 --- (12)H —At-Rest <br /> 1. Uniform, horizontal backfill, compacted to at least 92 percent of the ASTM D 1557 maximum dry density, <br /> rendering a maximum unit weight of 135 pcf. <br /> 2. Uniform surcharge,where S is surcharge pressure(psf). <br /> 3. Loading from heavy compaction equipment is not included. <br /> 4. No safety factor is included in these values. <br /> 5. Values are in addition to static earth pressures <br /> Backfill placed against structures should consist of Structural Fill, as discussed in the Earthwork <br /> section. For the pressure values presented above to be valid, the structural backfill must extend <br /> out and up from the base of the wall at an angle of at least 45 degrees. <br /> Responsive • Resourceful • Reliable 16 <br />