Question

Deadline: 4pm, Thursday, Oct 10. Hand in the submission electronically in DOC, PDF, or JPEG format) through MyUni Assignment online portal. Late submissions penalised 5% per day. Plagiarism will be penalised severely. 1. (10 marks): This tutorial continues Tutorial No. 4. The soil profile for proposed roadway construction is represented in Figure 1. A soil sample was recovered at A, and was tested in an oedometer device. The test results are provided in Table 1. The void ratio of the soil sample was e -0.98. Depth (m) % Tout (kN/m") Clayey Sand 19, 21 V Water Table Clay 19, 20 A Bedrock 22, 23 Figure 1 Soil profile for proposed roadway embankment construction. Table 1. Oedometer test results. Effective Stress, a' (kPa) Void Ratio,e 12.5 1.019 Comments Loading 0.985 Unloading 100 200 400 200 100 50 100 200 400 0.705 0.714 0.733 0.762 0.757 Reloading 0.686 0.450 800

Answer 1

Given data:

Effective Stress σ'(Kpa)	Void ratio (e)
12.5	1.019
25	1.013
50	1.001
100	0.985
200	0.938
400	0.705
200	0.714
100	0.733
50	0.762
100	0.757
200	0.733
400	0.686
800	0.45

a) Plot of consolidation curve

(b)

1.20 Recompression Virgin Compression curve 1.00 0.80 Void Ratio (e) Unloading 0.20 0.00 10 logo' 100 1000

(c) and (d)

Horizontal Bisector Tangent Void Ratio (e) O'P = 101 kPa 10 log o' 100 1000

cf compression andere (0.985-0.938) Ce = na E hogy = 0.156 Swelleng eneve (s = (0.762 -0.754) dog (100/50) i 0.016 di Consolidation betliment Ge= Cc. Ho dog (Totat Ho Mo) : 0.156* 9. dog (108 +2601 H0.969 l log Sc. - 0.367m Hou, Ho-am Co= 0.988 To is calmulated for point it from surfan. To = 1982 + 7 (20-10) - 108 Knelm.