The following information-was collected during a geotechnical evaluation for a s

Question

The following information-was collected during a geotechnical evaluation for a subject property. The idealized soil profile for the subject property is provided in the table below. Calculate the stress at the layer interfaces. Assume the soil has a specific gravity of 2.70. The soils encountered in borings were classified as SM or SC soils. Determine the following for the information provided: Vertical effective stress with depth, Active lateral earth pressure with depth, At-rest lateral earth pressure with depth, Passive lateral earth pressure with depth, N_60 at the midpoint of the layers (i.e., L = 1.25, 3.75, ..)

Explanation / Answer

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defth saturation y dry f bulk density k0 ka kp vertical stress pressure
rest active
pressure passive
pressure (1+w)*y dry 1-sinf (1-sin)f/(1+sinf) (1+sin)f/(1-sinf) lb/ft^2 lb/ft^2 lb/ft^2 lb/ft^2 0 38 90 28 124.200 0.530 0.361 2.771 0.000 0.000 0.000 0.000 2.49 38 90 28 124.200 0.530 0.361 2.771 309.258 164.016 111.603 856.973 2.51 45 91.7 28 132.965 0.530 0.361 2.771 333.742 177.002 120.438 924.820 4.99 45 91.7 28 132.965 0.530 0.361 2.771 663.495 351.888 239.437 1838.586 5.01 33 99.4 31 132.202 0.485 0.320 3.126 662.332 321.082 211.904 2070.200 7.49 33 99.4 31 132.202 0.485 0.320 3.126 990.193 480.021 316.799 3094.970 7.51 31 96 31 125.760 0.485 0.320 3.126 944.458 457.850 302.166 2952.018 9.99 31 96 31 125.760 0.485 0.320 3.126 1256.342 609.044 401.949 3926.853 10.01 43 96.5 33 137.995 0.455 0.295 3.394 1381.330 628.735 406.992 4688.228 14.99 43 96.5 33 137.995 0.455 0.295 3.394 2068.545 941.533 609.472 7020.633 15.01 59 108.1 33 171.879 0.455 0.295 3.394 2579.904 1174.286 760.138 8756.183 19.99 59 108.1 33 171.879 0.455 0.295 3.394 3435.861 1563.889 1012.335 11661.299 20.01 48 101.8 36 150.664 0.412 0.259 3.854 3014.787 1242.123 782.198 11619.739 29.99 48 101.8 36 150.664 0.412 0.259 3.854 4518.413 1861.632 1172.320 17415.091 30.01 50 102.8 36 154.200 0.412 0.259 3.854 4627.542 1906.594 1200.634 17835.700 39.99 50 102.8 36 154.200 0.412 0.259 3.854 6166.458 2540.643 1599.912 23767.065 40.01 45 106.4 36 154.280 0.412 0.259 3.854 6172.743 2543.233 1601.542 23791.289 49.99 45 106.4 36 154.280 0.412 0.259 3.854 7712.457 3177.611 2001.027 29725.731 50.01 46 106 36 154.760 0.412 0.259 3.854 7739.548 3188.772 2008.056 29830.145 59.99 46 106 36 154.760 0.412 0.259 3.854 9284.052 3825.124 2408.784 35783.051 60.01 56 102.7 33 160.212 0.455 0.295 3.394 9614.322 4376.118 2832.744 32630.970 70 56 102.7 33 160.212 0.455 0.295 3.394 11214.840 5104.620 3304.317 38063.121

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