EBK FUNDAMENTALS OF GEOTECHNICAL ENGINE
5th Edition
ISBN: 8220101425829
Author: SIVAKUGAN
Publisher: CENGAGE L
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Textbook Question
Chapter 4, Problem 4.7CTP
For the soils that are classified by the following AASHTO symbols, what would be the most likely USCS symbols? (Reference: Liu, 1970)
Gravels & sands: A-l-a, A-l-b, A3, A-2-4, A-2-5, A-2-6, A-2-7
Fines: A-4, A-5, A-6, A-7-5, A-7-6
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Table 2
British Soil Classification System for Engineering Purposes
Soil groups
GRAVEL and SAND may be qualified
sandy GRAVEL and gravelly SAND.
etc., where appropriate
Subgroups and laboratory identification
Subgroup
symbol
Fines
(% less
than
0.06 mm)
Group
symbol
Liquid
limit
Slightly silty or
GW
GW
clayey GRAVEL G
GP
GPu GPg
O to 5
Silty GRAVEL
G-MGWM GPM
Clayey GRAVEL
G-F
G-C GWC GPC
5 to 15
GM
GF
GC
Very silty GRAVEL
GML, etc
15 to 35
GCL
GCI
GCH
GCV
GCE
Very clayey
GRAVEL
Slightly silty or
clayey SAND
Sw
SW
O to 5
SP
SPu SPg
SWM SPM
swc SPC
Silty SAND
S-M
S-F
S-C
5 to 15
Clayey SAND
Very silty SAND
SM
SML, ete
SF
SC
15 to 35
SCL
SCI
SCH
SCV
SCE
Very clayey SAND
MG
FG
CG
Gravelly SILT
MLG, etc
CLG
CIG
CHG
CVG
CÉG
Gravelly CLAY
90
MS
FS
CS
Sandy SILT
MLS, ete
Sandy CLAY
CLS, etc
SILT (M-SOIL)
M
F.
ML, ete
CLAY
<35
50 to 70
70 to 90
-90
ORGANIC SOILS Descriptive letter O' suffixed to any group or
subgroup symbol
Pt
PEAT
Suos ANIH
more than 35% of the material
COARSE SOILS
less than…
3. Three boreholes (BH) along a proposed road intersection are shown in Figure la and b. The
soils in each borehole were classified using ASTM-CS. Sketch a soil profile along the center
line.
BH
ВН 2
BH 3
100 m
100 m
(a) Plan
El: 100.2
El: 99.5
E1: 102.7
SP
ML
CH
10
SP-SM
15 -
GP-GM
ВН 2
ВН З
20
ВН 1
(b) Borehole soil
Figure 1
Depth (m)
Plastic limit is present in sandy soils. If this statement is correct justify
Your answer, if not correct justify your answer.
Chapter 4 Solutions
EBK FUNDAMENTALS OF GEOTECHNICAL ENGINE
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- State whether the following are true or false. a. In the AASHTO classification Table 4.1, the soils that are more suitable for roadwork are located on the left than right. b. In AASHTO classification system, the better performing fine grained soils are the ones with lower group indices. c. In AASHTO classification system, sands are classified as grains with 0.075-4.75 mm diameter. d. The USCS symbol for clayey gravel is CG. e. A soil with USCS symbol SM is sandy silt.arrow_forward; Classify according to USCS and AASHTO: a. 16% fine gravel (20 mm max size), 61% fine sand, 23% silty fines. LL=33%, PL = 27%arrow_forwardClassify the following soils by USCS classification system. Percent finer than (sieve analysis) Liquid Limit Plasticity Limit Soil Cu Co No. 4 No. 200 1 71 4 Non Plastic 3.4 2.6 -- 2 70 30 33 12 Group Symbol Criteria for Assigning Group Symbols Gravels Clean Gravels C, 2 4 and 1 C¸>3° GW More than 50% Less than 5% fines“ GP of coarse fraction Gravels with Fines PI7 and plots on or above “A" line (Figure 3.20) GM Coarse-Grained Soils retained on No. 4 More than 12% fines“ GC More than 50% of sieve retained on No. 200 Sands Cu2 6 and 1 C>3° Clean Sands SW sieve 50% or more of Less than 5% fines" SP coarse fraction Sands with Fines PI7 and plots on or above “A" line (Figure 3.20) SM passes No. 4 sieve More than 12% fines»d SC PI >7 and plots on or above "A" line (Figure 3.20)° PI< 4 or plots below “A" line (Figure 3.20)° CL Inorganic Silts and Clays Liquid limit less than 50 ML Liquid limit-oven dried Liquid limit-not dried Fine-Grained Soils Organic < 0.75; see Figure 3.20; OL zone OL…arrow_forward
- .Q4 If gravel voulme conversion factor is like below and bedding layer should ,be compacted how much volume of loose gravel is needed (unit: m3) Soil Type Initial condition Gravel Bank Loose Compacted Bank 1 0.9 1.05 Converted to Loose 1.11 1 1.17 Compacted 0.95 0.86 1 إجابتكarrow_forward2. Based on the USCS, what is the 20 points percentage of the gravel in this sample? * Sieve Percent 100 Sieve 90 opening (mm) passing (finer) No. 80 70 4 4.75 99.0 60 10 2 94.0 50 20 0.85 67.4 40 30 30 0.6 51.4 20 40 0.425 39.4 10 60 0.25 23.4 140 0.106 13.4 0.01 0.1 1 10 200 0.075 2.0 Particle size (mm) Pan O (a) 0 % O (b) 6% O (c) 1% O (d) 32.6% Percent finer by weightarrow_forwardPROBLEM NO. 2 A fined grained soil (no sand) is found to have a liquid limit of 70%, and a plastic limit of 38%. 70 CH 60 PIOLL- -line RZ0.73(L 20) CL U-e 10 OL 30 MH -CL- ML 10 ML OH or OL 10 16 20 30 40 $0 70 80 Liquid limit a. What is the plasticity index for this soil? b. On the plasticity chart for USCS, what soil type is 90 100 this? c. On the plasticity chart for the AASHTO Classification System, what soil type is this? Plasticitý indexarrow_forward
- What is the soil type based on the USCS classification. cent paing Sieve#4, 52% Per nt pass Sieve#10, 42% Perce bassin Sieve#200, 10% LL=19, P 13,C 2.1, Cu38 O GC O GC-GM O GW-GC-GM O GW-GCarrow_forwardClassify soil B using USCS. LL-46%, PL=28%. Group symbol is and Group name is Grarel Sard Clay Coerse Med'um Fme 100 90 70 B 50 20 10 A 10 I 0.420 0.10 075 O 01 4.75 2 Particle Diameter (mm)arrow_forwardTo determine the plasticity limit in soils are available 2 test, E1= test #1 y E2= test #2. Identify the following events: 1- at least one test is available 2- both test are available 3- only test # 2 is available 4- none is availablearrow_forward
- Based on the sieve analysis a soil has % finer for the following sieves: No. 10- 86% ; No. 40- 56% and No. 200- 8%. No Plasticity. Classify the soil by AASHTO classification and give also the group index. Oa. A-1-b(0) Ob. A-3 (0) O c. A-2-6 (0) O d. A-2-7(1)arrow_forwardOutline the plasticity chart by placing its borders for the classification of fine particle soilsarrow_forwardBased on the sieve analysis a soil has % finer for the following sieves: No. 10- 42% ; No. 40- 28% and No. 200- 12%. The liquid limit 18 and Plasticity index is 13. Classify the soil by AASHT0 classification and give also the group index. a.A-2-6 (0) b.A-2-7(1) c.A-1-b(0) d.A-3 (0)arrow_forward
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