Answer Happy

Slightly overconsolidated clay is located 15 ft below the surface (OCR=1.3). The Cc and Cs of the clay are 0.25 and 0.05, respectively, and Cv=1.5x10-12/min The initial void ratio is 0.45. Please calculate the consolidation settlement. Assuming intact rock underneath clay, ie, the rock underneath cannot provide drainage path. (Cs=Cw). How long does it take to finish 75% of consolidation? 4p = 1 ksf Sand 8 feet y = 110 pcf. Water Table 7 feet Ysar - 115 per Clay w = 34%, LL = 50%. Yser = 120 pef 17 feet
Table 11.8 Variation of T, with U U (%) U (%) T, TV TV 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 T 0 0.00008 0.0003 0.00071 0.00126 0.00196 0.00283 0.00385 0.00502 0.00636 0.00785 0.0095 0.0113 0.0133 0.0154 0.0177 0.0201 0.0227 0.0254 0.0283 0.0314 0.0346 0.0380 0.0415 0.0452 0.0491 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 0.0531 0.0572 0.0615 0.0660 0.0707 0.0754 0.0803 0.0855 0.0907 0.0962 0.102 0.107 0.113 0.119 0.126 0.132 0.138 0.145 0.152 0.159 0.166 0.173 0.181 0.188 0.197 0.204 U (%) 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 0.212 0.221 0.230 0.239 0.248 0.257 0.267 0.276 0.286 0.297 0.307 0.318 0.329 0.304 0.352 0.364 0.377 0.390 0.403 0.417 0.431 0.446 0.461 0.477 0.493 0.511 U (%) 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 0.529 0.547 0.567 0.588 0.610 0.633 0.658 0.684 0.712 0.742 0.774 0.809 0.848 0.891 0.938 0.993 1.055 1.129 1.219 1.336 1.500 1.781 93 94 95 96 97 98 99 100 00 O A. 175 years o B. 144 years o C 203 years OD.98 years