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BFC 21702
CONFIDENTIAL
UNIVERSITI TUN HUSSEIN ONN MALAYSIA ANSWER SCHEME - TEST I SEMESTERI I SESSION 201 4/201 5 COURSE NAME
:
GEOTECHNIC SI
COURSE CODE
:
BFC2170 2
PROGRAMME
:
2 BFF
EXAMINATIONDATE
:
DURATION
:
1 HOUR AND 30 MINUTES
:
ANSWERALL QUESTIONS
INSTRUCTION
MARCH2015
THIS QUESTION PAPER CONSISTS TEN OF (10) PAGES 1
BFC 21702
CONFIDENTIAL Q1 (a) (i) Define the transported soil. List three major types of transported soils and described how each is formed. Answer: The transported soil are formed by the deposition of sediments that have transported from their places of origin by various agent.
been (1 mark)
Types of transported soil 1. Glacial soils- formed by transportation and deposition of glaciers 2. Alluvial soils – Transported by running water and deposited along stream 3. Lacustrine soils – fromed by deposition in quiet lakes 4. Marine soils – formed by deposition in the seas 5. Aeolian soils – formed by transported and deposited by wind 6. Colluvial soils – formed by movement of soil by gravity
Any three
(3 marks) (ii) The amount of moisture content in the fine grain soil will influence their characteristic. Explain briefly the liquid state, plastic state, semisolid state and solid state of the soil. Answer: Liquid state – the soil able to flow as liquid Plastic state – the soil can be molded into any desired shape without rupture Semisolid state- the soil cannot be molded without visible cracks appearing Solid state – the soil become solid and no further volume change occurs since all the water in the soil has been removed. (4 marks) (b) Sieve and hydrometer analysis have been performed on a soil sample from Kahang, Kluang Johor. The results of this test are shown in Figure Q1. (i) according
Determine the percentage of gravel, sand, silt and clay of the soil sample to AASHTO classification system.
% clay = 47 – 0 = 47% (4 marks) (ii) Estimate the effective size, the coefficient of uniformity and the coefficient of gradation of the soil sample. Answer: Effective size, D10 = 0
(1 mark)
D30 = 0
(1 mark)
D60 = 0.09
(1 mark)
coefficient of uniformity, Cu =
D60
D10 =
=
0.09
=0
(1 mark)
0
(D30)2 = (0)2 = 0
(1 mark) coefficient
of gradation, Cc D ·D60 0·0.09 10
(iii) From the Atterberg limit test, the liquid limit (LL) is 26% and plastic limit (PL) is 14%. If the sieve size of the sieve No. 10, No. 40 and No. 200 are 2.0 mm, 0.425 mm and 0.075 mm respectively, classify the soil according to AASHTO soil classification system. Show your steps of classification in detail. Answer: From Figure Q1, % passing at No. 200 sieve = 76% more than 35%, so refer to Silt-clay material table.
(2
marks) Possibility of the groups are A-4, A-5, A-6 and A-7. (2 mark) Given the LL = 26% and PL = 14%. Base on the Atterberg limit and Table Q1, group A-6 is suitabale for the given data. (4 marks)
3
BFC 21702
Q2
(a) Briefly explain with the aid of sketches what are three phase diagram and two phase diagrams that normally used in determining weight volume relationship. (6 marks) Answer:Three phase diagram for partially saturated condition. Two phase diagrams for saturated and dry conditons.
[3 x 2M = 6M] (b)Please derive that the moist unit weight of soil in the follwing form.
(Gs+e.Sr) γ moist =
γw 1+e
(4 marks) 4
BFC 21702
Answer:-
(c)The wet unit weight of a soil sample is 18.55 kN/m 3. Its specific gravity of solids and water content are 2.72 and 12.3%, respectively. Determine the: (i)
dry unit weight (kN/m3) (5 marks)
Answer:-
5
BFC 21702
(ii) void ratio, e (5 marks) Answer:-
6
BFC 21702
(iii)
degree of saturation. (5 marks)
Answer:-
-
END OF QUESTION -
TEST I SEMESTER / SESSION : SEM II / 2014/2015 COURSE : GEOTECHNICS I
PROGRAMME : 2 BFF COURSE CODE : BFC 21702
7
BFC 21702
CLAY
Coarse
Fine
SILT
SAND
GRAVEL
Figure Q1: Particle size distribution of Kahang, Kluang soil sample
Soil Classification
PI = -LLPL Cu = D60 D10
c=
(D·30D)
CD
10
8
2 60
BFC 21702
TEST I SEMESTER / SESSION : SEM II / 2014/2015 COURSE : GEOTECHNICS I
PROGRAMME : 2 BFF COURSE CODE : BFC 21702
TABLE Q1: AASHTO Soil Classification System
9
BFC 21702
TEST I SEMESTER / SESSION : SEM II / 2014/2015 COURSE : GEOTECHNICS I
PROGRAMME : 2 BFF COURSE CODE : BFC 21702
TABLE Q2: Various forms of relationship for g, gd and gsat
