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CONFIDENTIAL
BFC21702
UNIVERSITI TUN HUSSEIN ONN MALAYSIA
TEST 1 SEMESTER I SESSION 2017/2018
COURSE NAME
:
GEOTECHNICS 1
COURSE CODE
:
BFC21702
PROGRAMME CODE
:
EXAMINATION DATE
:
5 NOVEMBER 2017 / MARCH 2017
DURATION
:
1 HOUR 30 MINUTES
INSTRUCTIONS
:
1. ANSWER ALL QUESTIONS 2. WRITE DOWN YOUR ANSWERS IN THE ANSWER BOOKLET 3. ATTACH TTACH ALL A LL YOUR YOU R ANSWERS ANS WERS IN GRAPH PAPERS TO THE ANSWER BOOKLET
BACHELOR OF CIVIL BFF ENGINEERING WITH HONOURS
THIS QUESTION PAPER CONSISTS OF SIX (6) PAGES 1
CONFIDENTIAL
CONFIDENTIAL Q1
BFC21702
(a)
Liquid Limit ( LL) can be defined as the moisture content at which soil begins to behave as a liquid material and begins to flow. Sketch and explain the difference of liquid limit measurement method using Casagrande apparatus and Fall Cone method. (5 marks)
(b)
Two soil samples were collected in Melaka, Malaysia denoted as sample A and B. Both samples were tested using different liquid limit measurement methods and the result were recorded in Table Q1(a). (i)
Plot and determine the liquid limit ( LL) of sample A and B. (3 marks)
(ii)
Determine the flow index of both soil samples. Equation List can be used as references. (3 marks)
(iii) If given correlation between plastic index and flow index is PI(%) = 4.12 I F(%) and/or PI(%) = 0.74 I FC(%), determine the PI of each sample. (3 marks) (iv)
(c)
Based on Q1(b)(iii), choose which PI is more reasonable for construction project. Explain your answer. (2 marks)
Organic soils have been taken in Mersing, Sri Alam and Penggarang, Johor and denoted as sample X, Y and Z, respectively. The grain -size analysis of the soils are tabulated in Table Q1(b). (i)
Classify the soils using the AASHTO classification system in Table Q1(c). (3 marks)
(ii)
Calculate the Group Index of each soil. Use Equation List as your references. (3 marks)
(iii)
Choose the best soil to be used as subgrade material for the road construction. Justify your answer. (3 marks)
2
CONFIDENTIAL
CONFIDENTIAL
Q2
(a)
BFC21702
Explain the following components of soil based on weight-volume relationships. (i) (ii) (iii) (iv)
Bulk Density Specific Gravity Degree of saturation Unit weight (4 marks)
(b)
Soil mass consist of three main phases including fully saturated, partially saturated and dry soil. Illustrate and indicate the phase diagram of : (i)
Partially saturated soil with volume of soil solids equal to one. (3 marks)
(ii)
Fully saturated soil with volume of soil solids equal to one. (3 marks)
(c)
If
G s
s w ,where s is
proof that
V s has
the unit weight of soil and
relationship with
W s w G s
w is
the unit weight of water,
. (5 marks)
(d)
A soil sample collected in Ulu Tiram, Johor has a volume of 0.28 m 3 and weighs 5450 N. The oven dry weight of the soil is 4928 N. If G s = 2.73, calculate: (i)
The moisture content (%) and moist unit weight (kN/m 3). (2 marks)
(ii)
Dry unit weight (kN/m 3) and void ratio (%). (3 marks)
(iii)
Porosity (%) and degree of saturation (%). (4 marks)
END OF QUESTIONS
3
CONFIDENTIAL
CONFIDENTIAL
BFC21702
TEST 1 SEMESTER/SESSION COURSE NAME
: SEM I / 2017/2018 : GEOTECHNICS I
PROGRAMME CODE : 2 BFF COURSE CODE : BFC21702
TABLEQ1(a) : Samples collected in Melaka, Malaysia Soil Sample A
B
Number of blows,
Moisture content,
Cone Penetration,
Moisture content,
N
w (%)
d (mm)
w (%)
32
37
17
37
27
42
28
42
22
48
39
45
18
53
58
49
`
TABLE Q1(b) : Samples collected from Mersing, Sri Alam and Penggarang, Johor
Soil Type
Sieve analysis – Percent finer
Liquid
Plastic
No.10
No.40
No.200
Limit
Limit
X
100
92
80
56
33
Y
83
48
20
20
5
Z
92
68
30
42
24
4
CONFIDENTIAL
CONFIDENTIAL
BFC21702
TEST 1 SEMESTER/SESSION COURSE NAME
: SEM I / 2017/2018 : GEOTECHNICS I
PROGRAMME CODE : 2 BFF COURSE CODE : BFC21702
TABLE Q1(c): AASHTO Classification System (AASHTO M-145) General Classification Group classification Sieve analysis (% passing) No.10 (2.0 mm) No.40 (425µm) No.200 (75µm) Characteristics of fraction passing No. 40 (425µm)
Granular Material (35% or less passing 0.075 mm (Sieve No. 200) A-1 A-2 A-3 A-1-a A-1-b A-2-4 A-2-5 A-2-6
50 max 30 max 15 max
50 max 25 max
Liquid Limit Plasticity Index 6 max Usual types of significant Stone fragments, constituent gravel and sands materials General rating as subgrade a For A-7-5, PI ≤ LL-30 @ PL ≥ 30 b For A-7-6, PI > LL – 30 @ PL < 30
A-2-7
Fine Grained Soils (>35% passing 0.075 min (No. 200) A-7 A-4 A-5 A-6 A-7-5a A-7-6b
