Foundation-Engineering-Quiz Notes | EduRev

: Foundation-Engineering-Quiz Notes | EduRev

 Page 1


 DC-IITB-Foundation Engineering-Quiz-1, Page 1/2 
1. In a rock core sampling method at site, the total length of drilling was 2 m in 
rocky strata. There were seven intact pieces of rocks of lengths 150 mm, 220 
mm, 75 mm, 185 mm, 235 mm, 250 mm and 265 mm were collected. 
Compute the recovery ratio and RQD for the rock sample. Also comment on 
the in-situ rock quality as per Peck et al. (1974).                                            
 
2. At a site for soil exploration, three types of sampler tubes were available with 
outside diameter, inside diameter and length respectively as follows, (i) 
Sampler tube 1: 75 mm, 72 mm, 600 mm; (ii) Sampler tube 2: 110 mm, 107 
mm, 600 mm; (iii) Sampler tube 3: 50 mm, 35 mm, 600 mm. Now to obtain 
undisturbed soil sample, which sampler tube you will recommend and why? 
Also mention among the above, which sampler tube is used for SPT.           
 
3. In a triaxial shear test for a soil sample, cell pressure (confining pressure) was 
measured as 25 kN/m
2
 and the failure occurred at an additional vertical axial 
stress of 35 kN/m
2
. If the obtained failure plane makes an angle 52
0
 with 
horizontal, estimate the basic shear strength parameters of the soil sample.       
 
4. At a site in Mumbai, number of blows during SPT in a borehole of 15 cm 
diameter at depth of 5 m below ground level for three consecutive penetration 
of 15 cm each were recorded as 12, 15 and 16. Water table was found at 2 m 
below ground level and the visual soil classification was reported as fine silty 
sand.  Saturated unit weight of soil above and below water table was reported 
as 17 kN/m
3
. Actual velocity of impact of hammer was measured as 2.5 m/sec. 
After incorporating necessary corrections, estimate the corrected (N
1
)
60
 value 
for the soil sample at that depth. Also comment on the soil friction angle of 
this soil.                                                                                                           
 
 
5. A rigid concrete vertical retaining wall of height 6 m is supporting 
cohesionless dry backfill soil with unit weight of 18 kN/m
3
 and soil friction 
angle of 35
0
. The backfill soil slope is inclined at 15
0
 with horizontal. Estimate 
the total earth pressure at rest acting on the wall using Jaky’s equation. Two 
designers have given total active force and passive resistance acting on the 
wall using respectively Rankine’s and Coloumb’s methods of earth pressure 
analysis. Compute these values and as a chief designer, mention which value 
can be adopted for design of such wall under active and passive state of earth 
pressures respectively and why? Show all necessary and relevant results using 
figures which can be adopted directly at a design office.                               
 
 
******** END ******** 
Page 2


 DC-IITB-Foundation Engineering-Quiz-1, Page 1/2 
1. In a rock core sampling method at site, the total length of drilling was 2 m in 
rocky strata. There were seven intact pieces of rocks of lengths 150 mm, 220 
mm, 75 mm, 185 mm, 235 mm, 250 mm and 265 mm were collected. 
Compute the recovery ratio and RQD for the rock sample. Also comment on 
the in-situ rock quality as per Peck et al. (1974).                                            
 
2. At a site for soil exploration, three types of sampler tubes were available with 
outside diameter, inside diameter and length respectively as follows, (i) 
Sampler tube 1: 75 mm, 72 mm, 600 mm; (ii) Sampler tube 2: 110 mm, 107 
mm, 600 mm; (iii) Sampler tube 3: 50 mm, 35 mm, 600 mm. Now to obtain 
undisturbed soil sample, which sampler tube you will recommend and why? 
Also mention among the above, which sampler tube is used for SPT.           
 
3. In a triaxial shear test for a soil sample, cell pressure (confining pressure) was 
measured as 25 kN/m
2
 and the failure occurred at an additional vertical axial 
stress of 35 kN/m
2
. If the obtained failure plane makes an angle 52
0
 with 
horizontal, estimate the basic shear strength parameters of the soil sample.       
 
4. At a site in Mumbai, number of blows during SPT in a borehole of 15 cm 
diameter at depth of 5 m below ground level for three consecutive penetration 
of 15 cm each were recorded as 12, 15 and 16. Water table was found at 2 m 
below ground level and the visual soil classification was reported as fine silty 
sand.  Saturated unit weight of soil above and below water table was reported 
as 17 kN/m
3
. Actual velocity of impact of hammer was measured as 2.5 m/sec. 
After incorporating necessary corrections, estimate the corrected (N
1
)
60
 value 
for the soil sample at that depth. Also comment on the soil friction angle of 
this soil.                                                                                                           
 
 
5. A rigid concrete vertical retaining wall of height 6 m is supporting 
cohesionless dry backfill soil with unit weight of 18 kN/m
3
 and soil friction 
angle of 35
0
. The backfill soil slope is inclined at 15
0
 with horizontal. Estimate 
the total earth pressure at rest acting on the wall using Jaky’s equation. Two 
designers have given total active force and passive resistance acting on the 
wall using respectively Rankine’s and Coloumb’s methods of earth pressure 
analysis. Compute these values and as a chief designer, mention which value 
can be adopted for design of such wall under active and passive state of earth 
pressures respectively and why? Show all necessary and relevant results using 
figures which can be adopted directly at a design office.                               
 
 
******** END ******** 
Page 3


 DC-IITB-Foundation Engineering-Quiz-1, Page 1/2 
1. In a rock core sampling method at site, the total length of drilling was 2 m in 
rocky strata. There were seven intact pieces of rocks of lengths 150 mm, 220 
mm, 75 mm, 185 mm, 235 mm, 250 mm and 265 mm were collected. 
Compute the recovery ratio and RQD for the rock sample. Also comment on 
the in-situ rock quality as per Peck et al. (1974).                                            
 
2. At a site for soil exploration, three types of sampler tubes were available with 
outside diameter, inside diameter and length respectively as follows, (i) 
Sampler tube 1: 75 mm, 72 mm, 600 mm; (ii) Sampler tube 2: 110 mm, 107 
mm, 600 mm; (iii) Sampler tube 3: 50 mm, 35 mm, 600 mm. Now to obtain 
undisturbed soil sample, which sampler tube you will recommend and why? 
Also mention among the above, which sampler tube is used for SPT.           
 
3. In a triaxial shear test for a soil sample, cell pressure (confining pressure) was 
measured as 25 kN/m
2
 and the failure occurred at an additional vertical axial 
stress of 35 kN/m
2
. If the obtained failure plane makes an angle 52
0
 with 
horizontal, estimate the basic shear strength parameters of the soil sample.       
 
4. At a site in Mumbai, number of blows during SPT in a borehole of 15 cm 
diameter at depth of 5 m below ground level for three consecutive penetration 
of 15 cm each were recorded as 12, 15 and 16. Water table was found at 2 m 
below ground level and the visual soil classification was reported as fine silty 
sand.  Saturated unit weight of soil above and below water table was reported 
as 17 kN/m
3
. Actual velocity of impact of hammer was measured as 2.5 m/sec. 
After incorporating necessary corrections, estimate the corrected (N
1
)
60
 value 
for the soil sample at that depth. Also comment on the soil friction angle of 
this soil.                                                                                                           
 
 
5. A rigid concrete vertical retaining wall of height 6 m is supporting 
cohesionless dry backfill soil with unit weight of 18 kN/m
3
 and soil friction 
angle of 35
0
. The backfill soil slope is inclined at 15
0
 with horizontal. Estimate 
the total earth pressure at rest acting on the wall using Jaky’s equation. Two 
designers have given total active force and passive resistance acting on the 
wall using respectively Rankine’s and Coloumb’s methods of earth pressure 
analysis. Compute these values and as a chief designer, mention which value 
can be adopted for design of such wall under active and passive state of earth 
pressures respectively and why? Show all necessary and relevant results using 
figures which can be adopted directly at a design office.                               
 
 
******** END ******** 
Page 4


 DC-IITB-Foundation Engineering-Quiz-1, Page 1/2 
1. In a rock core sampling method at site, the total length of drilling was 2 m in 
rocky strata. There were seven intact pieces of rocks of lengths 150 mm, 220 
mm, 75 mm, 185 mm, 235 mm, 250 mm and 265 mm were collected. 
Compute the recovery ratio and RQD for the rock sample. Also comment on 
the in-situ rock quality as per Peck et al. (1974).                                            
 
2. At a site for soil exploration, three types of sampler tubes were available with 
outside diameter, inside diameter and length respectively as follows, (i) 
Sampler tube 1: 75 mm, 72 mm, 600 mm; (ii) Sampler tube 2: 110 mm, 107 
mm, 600 mm; (iii) Sampler tube 3: 50 mm, 35 mm, 600 mm. Now to obtain 
undisturbed soil sample, which sampler tube you will recommend and why? 
Also mention among the above, which sampler tube is used for SPT.           
 
3. In a triaxial shear test for a soil sample, cell pressure (confining pressure) was 
measured as 25 kN/m
2
 and the failure occurred at an additional vertical axial 
stress of 35 kN/m
2
. If the obtained failure plane makes an angle 52
0
 with 
horizontal, estimate the basic shear strength parameters of the soil sample.       
 
4. At a site in Mumbai, number of blows during SPT in a borehole of 15 cm 
diameter at depth of 5 m below ground level for three consecutive penetration 
of 15 cm each were recorded as 12, 15 and 16. Water table was found at 2 m 
below ground level and the visual soil classification was reported as fine silty 
sand.  Saturated unit weight of soil above and below water table was reported 
as 17 kN/m
3
. Actual velocity of impact of hammer was measured as 2.5 m/sec. 
After incorporating necessary corrections, estimate the corrected (N
1
)
60
 value 
for the soil sample at that depth. Also comment on the soil friction angle of 
this soil.                                                                                                           
 
 
5. A rigid concrete vertical retaining wall of height 6 m is supporting 
cohesionless dry backfill soil with unit weight of 18 kN/m
3
 and soil friction 
angle of 35
0
. The backfill soil slope is inclined at 15
0
 with horizontal. Estimate 
the total earth pressure at rest acting on the wall using Jaky’s equation. Two 
designers have given total active force and passive resistance acting on the 
wall using respectively Rankine’s and Coloumb’s methods of earth pressure 
analysis. Compute these values and as a chief designer, mention which value 
can be adopted for design of such wall under active and passive state of earth 
pressures respectively and why? Show all necessary and relevant results using 
figures which can be adopted directly at a design office.                               
 
 
******** END ******** 
Page 5


 DC-IITB-Foundation Engineering-Quiz-1, Page 1/2 
1. In a rock core sampling method at site, the total length of drilling was 2 m in 
rocky strata. There were seven intact pieces of rocks of lengths 150 mm, 220 
mm, 75 mm, 185 mm, 235 mm, 250 mm and 265 mm were collected. 
Compute the recovery ratio and RQD for the rock sample. Also comment on 
the in-situ rock quality as per Peck et al. (1974).                                            
 
2. At a site for soil exploration, three types of sampler tubes were available with 
outside diameter, inside diameter and length respectively as follows, (i) 
Sampler tube 1: 75 mm, 72 mm, 600 mm; (ii) Sampler tube 2: 110 mm, 107 
mm, 600 mm; (iii) Sampler tube 3: 50 mm, 35 mm, 600 mm. Now to obtain 
undisturbed soil sample, which sampler tube you will recommend and why? 
Also mention among the above, which sampler tube is used for SPT.           
 
3. In a triaxial shear test for a soil sample, cell pressure (confining pressure) was 
measured as 25 kN/m
2
 and the failure occurred at an additional vertical axial 
stress of 35 kN/m
2
. If the obtained failure plane makes an angle 52
0
 with 
horizontal, estimate the basic shear strength parameters of the soil sample.       
 
4. At a site in Mumbai, number of blows during SPT in a borehole of 15 cm 
diameter at depth of 5 m below ground level for three consecutive penetration 
of 15 cm each were recorded as 12, 15 and 16. Water table was found at 2 m 
below ground level and the visual soil classification was reported as fine silty 
sand.  Saturated unit weight of soil above and below water table was reported 
as 17 kN/m
3
. Actual velocity of impact of hammer was measured as 2.5 m/sec. 
After incorporating necessary corrections, estimate the corrected (N
1
)
60
 value 
for the soil sample at that depth. Also comment on the soil friction angle of 
this soil.                                                                                                           
 
 
5. A rigid concrete vertical retaining wall of height 6 m is supporting 
cohesionless dry backfill soil with unit weight of 18 kN/m
3
 and soil friction 
angle of 35
0
. The backfill soil slope is inclined at 15
0
 with horizontal. Estimate 
the total earth pressure at rest acting on the wall using Jaky’s equation. Two 
designers have given total active force and passive resistance acting on the 
wall using respectively Rankine’s and Coloumb’s methods of earth pressure 
analysis. Compute these values and as a chief designer, mention which value 
can be adopted for design of such wall under active and passive state of earth 
pressures respectively and why? Show all necessary and relevant results using 
figures which can be adopted directly at a design office.                               
 
 
******** END ******** 
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