J_2024 05 09_West Orange Stormwater Management Plan

5165-243*1 D PSEG West Orange Switching Station Improvements West Orange, Essex County, New Jersey Immediate Settlement Analysis Analysis description: 12’x15' Transformer pad with 2.8 ksf load Definition and entry of variables: B= 12 least lateral dimension of footing (ft.) L= 15 longest lateral dimension of footing (ft.) 1.25 L7B = 1.2 a= From Figure 3.23 in Das ar = 0.9 M= 0.3 Poisson's ratio qa =» 2.8 intensity of contact pressure (ksf) E,. 448 Young's Modulus (ksf) 28 cohesion (psf) Avg SPT "N" value from borings c= N= Values or value ranges for Poisson’s ratio p Type of soil /< 0.4-0.5 0.1-0.3 0.2-0.3 0.3 0.35 -0.1-1.00 0.3-0.4 O.l-0.4 (depends somewhat Clay.saturated Clay, uusaturated Sandy clay Silt Sand, gravelly sand From Figure 3.23 in Das commonly used Rock type of rock) 0.1-0.3 0.36 0.15 Loess Ice Concrete 3.0 • 2.3 Sands: a^ E, = 8N (tsf) , 2.0 a Clays (normally consolidated) ^--------- E, = 250c to 500c 1.5 1.0 0.3 1 For circular foundation a =1 a„ - 0.85 a, - 0.88 *! 2 3 4 5 6 7 8 Clays (overconsolidated) E, = 750c to 1000c____________ Ave of N for SBH-3 to 25’ Ave N =30 10 LfB Figure 3.23 Values of a. a„. and o,—Eqs. (3.62), (3.63), (3.66), (3.87) (8)28=224 TSF Calculate settlement Assume rigid foundation AH' Sources: Values of a: Values of p: AH formula: Es formulas: 0.74 Principles of Foundation Engineering by Das, 2nd Edition, p. 157 Foundation Analysis & Design by Bowles, 4th Edition, p. 100 Principles of Foundation Engineering by Das, 2nd Edition, p. 156 Principles of Foundation Engineering by Das, 2nd Edition, p. 161