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: Typical 4x4 footing with 4 ksf load Definition and entry of variables: B= least lateral dimension of footing (ft.) L= longest lateral dimension of footing (ft.) L/8 = a= 1.1 From Figure 3.23 in Das a r= M= g0= Es, 0.8 From Figure 3.23 in Das 0.3 Poisson's ratio c= N= Type of soil 1* 0.4-0.5 0.1-O.3 0.2-0.) 0.3 0.3S -0.1-1.00 0.3-0.4 0.1-0.4 (depends somewhat on Clay, saturated Clay, unsaluratcd Sandy clay Silt Sand, gravelly sand commonly used Rock intensity of contact pressure (ksf) 368 Values or value ranges for Poisson’s ratio n Young's Modulus (ksf) cohesion (psf) Avg SPT "N" value from borings 23 type of rock) 0.1-0.3 Loess fee Concrete 0.36 0.1 S 3.0 2.5 Sands: E, = 8N (tsf) __-------- 20 Clays (normally consolidated) a* E, = 250c to 500c 1.5 For circular foundation a =“ 1 a„ - 0.85 a, - 0.88 1.0 0.5 l 2 3 4 5 6 7 8 Clays (overconsolidated) Es = 750c to 1000c 10 L/B Average N for SBH-3 to ±11’ Ave N=23 (8)23=184 TSF Figure 3.23 Values of a, or.., and a,—Eqs. (3.62), (3.63), (3.66), (3.67) Calculate settlement Assume Rigid foundation AH = Sources: Values of a: Values of p: AH formula: Es formulas: 0.38" 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