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1 Final Exam, Second Semester: 2015/2016 Civil Engineering Department Course Title: SOIL MECHANICS Date: 9/6/2016 Course No: Time: 2 hours Lecturer: Dr. Mohammed Mustafa Al-Iessa No. of pages: 9 Instructions: ALLOWED: Non-programmable calculator, pens and drawing tools (no red colour). NOT ALLOWED: Papers, literatures and any handouts. Otherwise, it will lead to the non-approval of your examination. Shut down Telephones, and other communication devices. Please note: Write your name and your matriculation number on every page of the solution sheets. All solutions together with solution methods (explanatory statement) must be inserted in the labelled position on the solution sheets. Support your answer with diagrams, equations and examples when possible You can submit your exam after the first hour. Question 1 A : (6 marks) A wet soil sample has a total mass (m t = 2212 gm), air content (A% = 6%), volume of soil solids (v s = 729 cm 3 ), and a specific gravity (G s = 2.71). Find: a) Water content (w%). b) Degree of saturation (S%). c) Wet unit weight (ɣ wet in kn/m 3 ). Page 1 of 9
2 Question 1 B : (4 marks) Classify the following soil according to UNIFIED soil classification system: D 10 = mm D 30 = 0.12 mm D 60 = mm L. L. = 30 % P.L. = 22 % % Passing #4 sieve = 95 % % Retained on #200 sieve = 90 % Page 2 of 9
3 Question 2 A : (8 marks) For the soil profile and loading condition shown in figures. Determine the change in vertical total stress ( Δσ v ) at point ( A ). Structure, Weight = 3360 kn 2 m Structure 2 m 2 m ɣ = 21 kn/m 3 7 m A 2 m A 3 m 2 m 3 m SOIL PROFILE PLAN Page 3 of 9
4 Question 2 B : (4 marks) For the soil element and stresses shown in figure. Determine the principal stresses (σ 1 and σ 3 ) and their orientation (θ). 400 kn/m 2 40 kn/m kn/m kn/m 2 40 kn/m kn/m 2 Page 4 of 9
5 Question 3 : For the soil profile and flow condition shown in figure. Determine: a) The effective stress (σ ) at level (C). b) Total head (h t ) at (C) for critical hydraulic head (H critical ) at (B). Peizometer (8 marks) 4 m Soil 1 Ɣ = 18 kn/m 3 k = 0.5 cm/sec A B H 7 m 6 m Soil 2 Ɣ = 20 kn/m 3 k = 2 cm/sec Datum C Page 5 of 9
6 Question 4 A : (5 marks) Two samples of a silty clay soil were tested in consolidated undrained ( CU ) triaxial test. The following results were recorded at failure: Sample No. Cell Pressure (σ 3 ) in kn/m 2 Deviator stress (σ d ) in kn/m 2 Pore water pressure at failure (U f ) in kn/m Find : Shear strength parameters in terms of effective stress (C, ø ). Page 6 of 9
7 Question 4 B : (5 marks) A fully saturated normally consolidated clay (N.C.C.) soil was tested in an Unconfined Compression test and Unconsolidated Undrained (UU) test. Given that: C = 125 kn/m 2, C = 0, ø = 0, ø = 28 o. a) In the Unconfined Compression test, the sample failed at a deviator stress (σ d ) of (250 kn/m 2 ). Find the pore water pressure at failure (U f ). b) In the Unconsolidated Undrained (UU) test, the cell pressure (σ 3 ) at failure was (400 kn/ m 2 ). Find the deviator stress (σ d ) at failure. Page 7 of 9
8 Page 8 of 9
9 Page 9 of 9
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