2 m 1.5 m 3 m 8 m A B 4 m 3 m C 4 m 2.5 m 2.5 m Y(1) = 16.0 kN/m³ =26° Y(2) = 19.0 kN/m³ (2) = 28° Y(3) = 19.0 kN/m³ (3)=30° Fig. 2 8. Explain the phenomena of "bottom heave" and "piping" during a cut. Bearing capacity equation: q=cNFFF+NFFF+0.5BN F F F Equations and Tables: K. 1-sino' K₁ = 0.95-sin ' Shape factors by De Depth factors by Hansen (1970) Inclination factors by Meyerhof (1963) Beer (1970) and Hanna and Meyerhof (1981) LN Fo=1+(x) F =1+(-) tan 6 F =1+0.4(+) B F₁ =1+2 tan ø'(1-sin ø')² | F, = (1- B F₁ = F₁₂ = (1-B 90° F, =1-0.4() F₁ =1 Table 4.2 Bearing Capacity Factors NE Na Ny N N N K o(overconsolidate) K o(normally consolidated) √OCR 0 5.14 1.00 0.00 1 5.38 1.09 0.07 2 5.63 1.20 0.15 K = tan² (45-%) 34567 5.90 1.31 0.24 6.19 1.43 0.34 6.49 1.57 0.45 21 6.81 1.72 0.57 7.16 1.88 0.71 K₁ = cosa-√cos a-cos² ' =COS& K, cosa + √cos² a-cos² o' 8 7.53 2.06 0.86 =COS& 9 7.92 2.25 1.03 cosa + √cos² a-cos² ' Cosa – -√cos² cos² a-cos² ' 10 8.35 2.47 1.22 11 8.80 2.71 1.44 27 12 9.28 2.97 1.69 K sin² (B+) 13 sin ẞ sin(ẞ-8)[1+ sin('+5) sin(-a)2 sin(B-8) sin(a+B)" 14 15 345 9.81 3.26 1.97 10.37 3.59 2.29 10.98 3.94 2.65 SERDAR2222222223 16 11.63 4.34 3.06 17 12.34 4.77 3.53 18 13.10 5.26 4.07 19 13.93 5.80 4.68 20 14.83 6.40 5.39 15.82 7.07 6.20 16.88 7.82 7.13 18.05 8.66 8.20 24 19.32 9.60 9.44 25 20.72 10.66 10.88 26 22.25 11.85 12.54 23.94 13.20 14.47 28 25.80 14.72 16.72 29 27.86 16.44 19.34 30 30.14 18.40 22.40 31 32.67 20.63 25.99 (continued) K₁ sin(B-) Table 4.2 Bearing Capacity Factors (Continued) sin ẞ sin(B+)[1- sin('+) sin('+a)₁₂ Vsin(+6) sin(a + ẞ) $' No Na N₁ φ' No N₁₂ Ny 32 35.49 23.18 30.22 42 93.71 85.38 155.55 33 38.64 26.09 35.19 43 105.11 99.02 186.54 34 42.16 29.44 41.06 44 118.37 115.31 224.64 35 46.12 33.30 48.03 45 133.88 134.88 271.76 36 50.59 37.75 56.31 46 152.10 158.51 330.35 37 55.63 42.92 66.19 47 173.64 187.21 403.67 38 61.35 48.93 78.03 48 199.26 222.31 496.01 39 67.87 55.96 92.25 49 229.93 265.51 613.16 40 75.31 64.20 109.41 50 266.89 319.07 762.89 41 83.86 73.90 130.22

2 m 1.5 m 3 m 8 m A B 4 m 3 m C 4 m 2.5 m 2.5 m Y(1) = 16.0 kN/m³ =26° Y(2) = 19.0 kN/m³ (2) = 28° Y(3) = 19.0 kN/m³ (3)=30° Fig. 2 8. Explain the phenomena of "bottom heave" and "piping" during a cut. Bearing capacity equation: q=cNFFF+NFFF+0.5BN F F F Equations and Tables: K. 1-sino' K₁ = 0.95-sin ' Shape factors by De Depth factors by Hansen (1970) Inclination factors by Meyerhof (1963) Beer (1970) and Hanna and Meyerhof (1981) LN Fo=1+(x) F =1+(-) tan 6 F =1+0.4(+) B F₁ =1+2 tan ø'(1-sin ø')² | F, = (1- B F₁ = F₁₂ = (1-B 90° F, =1-0.4() F₁ =1 Table 4.2 Bearing Capacity Factors NE Na Ny N N N K o(overconsolidate) K o(normally consolidated) √OCR 0 5.14 1.00 0.00 1 5.38 1.09 0.07 2 5.63 1.20 0.15 K = tan² (45-%) 34567 5.90 1.31 0.24 6.19 1.43 0.34 6.49 1.57 0.45 21 6.81 1.72 0.57 7.16 1.88 0.71 K₁ = cosa-√cos a-cos² ' =COS& K, cosa + √cos² a-cos² o' 8 7.53 2.06 0.86 =COS& 9 7.92 2.25 1.03 cosa + √cos² a-cos² ' Cosa – -√cos² cos² a-cos² ' 10 8.35 2.47 1.22 11 8.80 2.71 1.44 27 12 9.28 2.97 1.69 K sin² (B+) 13 sin ẞ sin(ẞ-8)[1+ sin('+5) sin(-a)2 sin(B-8) sin(a+B)" 14 15 345 9.81 3.26 1.97 10.37 3.59 2.29 10.98 3.94 2.65 SERDAR2222222223 16 11.63 4.34 3.06 17 12.34 4.77 3.53 18 13.10 5.26 4.07 19 13.93 5.80 4.68 20 14.83 6.40 5.39 15.82 7.07 6.20 16.88 7.82 7.13 18.05 8.66 8.20 24 19.32 9.60 9.44 25 20.72 10.66 10.88 26 22.25 11.85 12.54 23.94 13.20 14.47 28 25.80 14.72 16.72 29 27.86 16.44 19.34 30 30.14 18.40 22.40 31 32.67 20.63 25.99 (continued) K₁ sin(B-) Table 4.2 Bearing Capacity Factors (Continued) sin ẞ sin(B+)[1- sin('+) sin('+a)₁₂ Vsin(+6) sin(a + ẞ) $' No Na N₁ φ' No N₁₂ Ny 32 35.49 23.18 30.22 42 93.71 85.38 155.55 33 38.64 26.09 35.19 43 105.11 99.02 186.54 34 42.16 29.44 41.06 44 118.37 115.31 224.64 35 46.12 33.30 48.03 45 133.88 134.88 271.76 36 50.59 37.75 56.31 46 152.10 158.51 330.35 37 55.63 42.92 66.19 47 173.64 187.21 403.67 38 61.35 48.93 78.03 48 199.26 222.31 496.01 39 67.87 55.96 92.25 49 229.93 265.51 613.16 40 75.31 64.20 109.41 50 266.89 319.07 762.89 41 83.86 73.90 130.22

Principles of Foundation Engineering (MindTap Course List)

8th Edition

ISBN:9781305081550

Author:Braja M. Das

Publisher:Braja M. Das

Chapter15: Braced Cuts

Section: Chapter Questions

Problem 15.11P

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