Hot questions in Geotechnical Engineering / GO Civil

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121

GATE Civil 2013 | Question: 14
Following statements are made on compacted soils, wherein DS stands for the soils compacted on dry side of optimum moisture content and WS stands for the soils compacted on wet side of optimum moisture content. Identify the $\textit{incorrect}$ statement. Soil structure ... shrinkage is high on DS and low on WS On access to water, swelling is high on DS and low on DS

Following statements are made on compacted soils, wherein DS stands for the soils compacted on dry side of optimum moisture content and WS stands for the soils compacted ...

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122

GATE2017 CE-1: 50
A consolidated undrained $(\overline{CU})$ triaxial compression test is conducted on a normally consolidated clay at a confining pressure of $100$ kPa. The deviator stress at failure is $80$ kPa, and the pore-water pressure measured at failure is $50$ kPa. The effective angle of internal friction (in degrees, up to one decimal place) of the soil is __________

A consolidated undrained $(\overline{CU})$ triaxial compression test is conducted on a normally consolidated clay at a confining pressure of $100$ kPa. The deviator stres...

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123

GATE2014-2-14
The clay mineral primarily governing the swelling behavior of Black Cotton soil is Halloysite Illite Kaolinite Montmorillonite

The clay mineral primarily governing the swelling behavior of Black Cotton soil isHalloysiteIlliteKaoliniteMontmorillonite

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124

GATE Civil 2012 | Question: 37
A layer of normally consolidated, saturated silty clay of $1$ m thickness is subjected to one dimensional consolidation under a pressure increment of $20$ kPa. The properties of the soil are: specific gravity $=2.7$, natural moisture content $=45 \%$, compression ... the primary consolidation settlement (rounded off to the nearest mm) is $2$ mm $9$ mm $14$ mm $16$ mm

A layer of normally consolidated, saturated silty clay of $1$ m thickness is subjected to one dimensional consolidation under a pressure increment of $20$ kPa. The proper...

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125

GATE2015-1-38
An earth embankment is to be constructed with compacted cohesionless soil. The volume of the embankment is $5000 \: m^3$ and the target dry unit weight is $16.2 \: kN/m^3$. Three nearby sites (see figure below) have been identified from where the required soil can be transported to ... solution (Use unit weight of water $= 10 \: kN/m^3$). Site $X$ Site $Y$ Site $Z$ Any of the sites

An earth embankment is to be constructed with compacted cohesionless soil. The volume of the embankment is $5000 \: m^3$ and the target dry unit weight is $16.2 \: kN/m^3...

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126

GATE2014-1-14
For a saturated cohesive soil, a triaxial test yields the angle of internal friction $( \phi)$ as zero. The conducted test is Consolidated Drained (CD) test Consolidated Undrained (CU) test Unconfined Compression (UC) test Unconsolidated Undrained (UU) test

For a saturated cohesive soil, a triaxial test yields the angle of internal friction $( \phi)$ as zero. The conducted test isConsolidated Drained (CD) testConsolidated Un...

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127

GATE2014-1-38
A given cohesionless soil has $e_{\text{max}} = 0.85$ and $e_{\text{min}} =0.50$. In the field, the soil is compacted to a mass density of $1800 \: kg/m^3$ at a water content of $8 \%$. Take the mass density of water as $1000 \: kg/m^3$ and $G_s$ as $2.7$. The relative density (in $\%$) of the soil is $56.43$ $60.25$ $62.87$ $65.71$

A given cohesionless soil has $e_{\text{max}} = 0.85$ and $e_{\text{min}} =0.50$. In the field, the soil is compacted to a mass density of $1800 \: kg/m^3$ at a water con...

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128

GATE Civil 2013 | Question: 15
Four columns of a building are to be located within a plot size of $10 \: m \times 10 \: m$. The expected load on each column is $4000$ kN. Allowable bearing capacity of the soil deposit is $100 \: kN/m^2$. The type of foundation best suited is isolated footing raft foundation pile foundation combined footing

Four columns of a building are to be located within a plot size of $10 \: m \times 10 \: m$. The expected load on each column is $4000$ kN. Allowable bearing capacity of ...

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129

GATE2015-2-12
If the water content of a fully saturated soil mass is $100\%$, the void ratio of the sample is: less than specific gravity of soil equal to specific gravity of soil greater than specific gravity of soil independent of specific gravity of soil

If the water content of a fully saturated soil mass is $100\%$, the void ratio of the sample is:less than specific gravity of soilequal to specific gravity of soilgreater...

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130

GATE Civil 2013 | Question: 12
In its natural condition, a soil sample has a mass of $1.980$ kg and a volume of $0.001 \: m^3$. After being completely dried in an oven, the mass of the sample is $1.800$ kg. Specific gravity G is $2.7$. Unit weight of water is $10 \: kN/m^3$. The degree of saturation of the soil is $0.65$ $0.70$ $0.54$ $0.61$

In its natural condition, a soil sample has a mass of $1.980$ kg and a volume of $0.001 \: m^3$. After being completely dried in an oven, the mass of the sample is $1.800...

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131

GATE2015-2-37
A $588 \: cm^3$ volume of moist sand weighs $1010$ gm. Its dry weight is $918$ gm and specific gravity of solids, $G$ is $2.67$. Assuming density of water as $1 \: gm/cm^3$, the void ratio is _________.

A $588 \: cm^3$ volume of moist sand weighs $1010$ gm. Its dry weight is $918$ gm and specific gravity of solids, $G$ is $2.67$. Assuming density of water as $1 \: gm/cm^...

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132

GATE2015-2-38
A $4$ m thick layer of normally consolidated clay has an average void ratio of $1.30$. Its compression index is $0.6$ and coefficient of consolidation is $1 \: m^2/yr$. If the increase in vertical pressure due to foundation load on the clay layer is equal to the existing effective overburden pressure, the change in the thickness of the clay layer is _______ mm.

A $4$ m thick layer of normally consolidated clay has an average void ratio of $1.30$. Its compression index is $0.6$ and coefficient of consolidation is $1 \: m^2/yr$. I...

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133

GATE Civil 2013 | Question: 25
The latitude and departure of a line AB are $+78$ m and $-45.1$ m respectively. The whole circle bearing of the line AB is $30^{\circ}$ $150^{\circ}$ $210^{\circ}$ $330^{\circ}$

The latitude and departure of a line AB are $+78$ m and $-45.1$ m respectively. The whole circle bearing of the line AB is $30^{\circ}$$150^{\circ}$$210^{\circ}$$330^{\ci...

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134

GATE2014-2-38
Group I enlists in-situ field tests carried out for soil exploration, while Group II provides a list of parameters for sub-soil strength characterization. Match the type of tests with the characterization parameters. ... $P-1; Q-2; R-3; S-4$ $P-2; Q-3; R-4; S-1$ $P-4; Q-1; R-2; S-3$

Group I enlists in-situ field tests carried out for soil exploration, while Group II provides a list of parameters for sub-soil strength characterization. Match the type ...

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135

GATE Civil 2012 | Question: 49
The flow net around a sheet pile wall is shown in the sketch. The properties of the soil are: permeability coefficient $0.09 \: m/day$ (isotropic), specific gravity $=2.70$ and void ratio $=0.85$. The sheet pile wall and the bottom of the soil are impermeable. The factor of safety against the occurrence of piping failure is $3.55$ $2.93$ $2.60$ $0.39$

The flow net around a sheet pile wall is shown in the sketch. The properties of the soil are: permeability coefficient $0.09 \: m/day$ (isotropic), specific gravity $=2.7...

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136

GATE Civil 2013 | Question: 38
Two different soil types (Soil $1$ an Soil $2$) are used as backfill behind a retaining wall as shown in the figure, where $\gamma_t$ is total unit weight, and $c’$ and $\phi’$ are effective cohesion and effective angle of shearing resistance. The resultant active earth forceper unit length (in kN/m) acting on the wall is $31.7$ $35.2$ $51.8$ $57.0$

Two different soil types (Soil $1$ an Soil $2$) are used as backfill behind a retaining wall as shown in the figure, where $\gamma_t$ is total unit weight, and $c’$ and...

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137

GATE Civil 2013 | Question: 13
The ratio $N_f/N_d$ is known as shape factor, where $N_f$ is the number of flow lines and $N_d$ is the number of equipotential drops. Flow net is always drawn with a constant $b/a$ ratio, where $b$ and $a$ are ... downstream heads are interchanged soil in the flow space is changed dimensions of the flow space are changed head difference causing the flow is changed

The ratio $N_f/N_d$ is known as shape factor, where $N_f$ is the number of flow lines and $N_d$ is the number of equipotential drops. Flow net is always drawn with a cons...

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138

GATE2014-1-39
The following data are given for the laboratory sample. $\sigma_0=175$ kPa; $e_0 =1.1$; $\sigma_0 + \Delta \sigma_0 =300$ kPa; $e=0.9$ If thickness of the clay specimen is $25$ mm, the value of coefficient of volume compressibility is ______ $\times 10^{-4} m^2/kN$

The following data are given for the laboratory sample.$\sigma_0=175$ kPa; $e_0 =1.1$; $\sigma_0 + \Delta \sigma_0 =300$ kPa; $e=0.9$If thickness of the clay specimen is...

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139

GATE2014-2-16
A certain soil has the following properties: $G_s=2.71$, $n=40 \%$ and $w=20 \%$. The degree of saturation of the soil (rounded off to the nearest percent) is ______

A certain soil has the following properties: $G_s=2.71$, $n=40 \%$ and $w=20 \%$. The degree of saturation of the soil (rounded off to the nearest percent) is ______

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140

GATE2014-1-16
A long slope is formed in a soil with shear strength parameters$: c'=0$ and $\phi=34^{\circ}$ ... of $1.5$, assuming a potential failure surface parallel to the slope, would be $45.3$ $44.7$ $12.3$ $11.3$

A long slope is formed in a soil with shear strength parameters$: c’=0$ and $\phi=34^{\circ}$. A firm stratum lies below the slope and it is assumed that the water tabl...

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141

GATE2014-1-13
The degree of disturbance of the sample collected by the sampler is expressed by a term called the “area ratio”. If the outer diameter and inner diameter of the sampler are $D_o$ and $D_i$ respectively, the area ratio is given by $\dfrac{D_o^2-D_i^2}{D_i^2} \\$ $\dfrac{D_i^2-D_o^2}{D_i^2} \\$ $\dfrac{D_o^2-D_i^2}{D_o^2} \\$ $\dfrac{D_i^2-D_0^2}{D_o^2}$

The degree of disturbance of the sample collected by the sampler is expressed by a term called the “area ratio”. If the outer diameter and inner diameter of the sampl...

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142

GATE Civil 2012 | Question: 15
An embankment is to be constructed with a granular soil (bulk unit weight $=20 \: kN/m^3$) on a saturated clayey silt deposit (undrained shear strength $=25$ kPa). Assuming undrained general shear failure and bearing capacity factor of $5.7$, the maximum height (in m) of the embankment at the point of failure is $7.1$ $5.0$ $4.5$ $2.5$

An embankment is to be constructed with a granular soil (bulk unit weight $=20 \: kN/m^3$) on a saturated clayey silt deposit (undrained shear strength $=25$ kPa). Assumi...

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143

GATE2018 CE-2: 18
The initial concavity in the load-penetration curve of a CBR test is NOT due to uneven top surface high impact at start of loading inclined penetration plunger soft top layer of soaked soil

The initial concavity in the load-penetration curve of a CBR test is NOT due touneven top surfacehigh impact at start of loadinginclined penetration plungersoft top layer...

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144

GATE2018 CE-1: 21
A core cutter of $130$ mm height has inner and outer diameters of $100$ mm and $106$ mm, respectively. The area ratio of the core cutter (in $\%$, up to two decimal places) is _____

A core cutter of $130$ mm height has inner and outer diameters of $100$ mm and $106$ mm, respectively. The area ratio of the core cutter (in $\%$, up to two decimal place...

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145

GATE2018 CE-2: 11
The clay mineral, whose structural units are held together by potassium bond is Halloysite Illite Kaolinite Smectite

The clay mineral, whose structural units are held together by potassium bond isHalloysiteIlliteKaoliniteSmectite

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146

GATE2018 CE-1: 46
The void ratio of a soil is $0.55$ at an effective normal stress of $140$ kPa. The compression index of the soil is $0.25$. In order to reduce the void ratio to $0.4$, an increase in the magnitude of effective normal stress (in kPa, up to one decimal place) should be ________

The void ratio of a soil is $0.55$ at an effective normal stress of $140$ kPa. The compression index of the soil is $0.25$. In order to reduce the void ratio to $0.4$, an...

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147

GATE2018 CE-1: 45
A conventional drained triaxial compression test was conducted on a normally consolidated clay sample under an effective confining pressure of $200$ kPa. The deviator stress at failure was found to be $400$ kPa. An identical specimen of the same clay sample is ... deviator stress at failure is $150$ kPa, the pore pressure developed (in kPa, up to one decimal place) is ________

A conventional drained triaxial compression test was conducted on a normally consolidated clay sample under an effective confining pressure of $200$ kPa. The deviator str...

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148

GATE2018 CE-2: 8
A flownet below a dam consists of $24$ equipotential drops and $7$ flow channels. The difference between the upstream the upstream and downstream water levels is $6$ m. The length of the flow line adjacent to the toe of the dam at exit is $1$ m. The specific gravity and void ... dam are $2.70$ and $0.70$, respectively. The factor of safety against piping is $1.67$ $2.5$ $3.4$ $4$

A flownet below a dam consists of $24$ equipotential drops and $7$ flow channels. The difference between the upstream the upstream and downstream water levels is $6$ m. T...

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149

GATE2018 CE-1: 47
A rigid smooth retaining wall of height $7$ m with vertical backface retains saturated clay ass backfill. The saturated unit weight and undrained cohesion of the backfill are $17.2 \: kN/m^3$ and $20 \: kPa$, respectively. The difference in the active ... ( in $kN$ per meter length of wall, up to two decimal places), before and after the occurrence of tension crack is _____

A rigid smooth retaining wall of height $7$ m with vertical backface retains saturated clay ass backfill. The saturated unit weight and undrained cohesion of the backfill...

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150

GATE2018 CE-2: 32
A $3$ m high vertical earth retaining wall retains a dry granular backfill with angle of internal friction of $30^{\circ}$ and unit weight of $20 \: kN/m^3$. If the wall is prevented from yielding (no movement), the total horizontal thrust (in kN per unit length) on the wall is $0$ $30$ $45$ $270$

A $3$ m high vertical earth retaining wall retains a dry granular backfill with angle of internal friction of $30^{\circ}$ and unit weight of $20 \: kN/m^3$. If the wall...

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151

GATE2018 CE-1: 10
The percent reduction in the bearing capacity of a strip footing resting on sand under flooding condition (water level at the base of the footing) when compared to the situation where the water level is at a depth much greater than the width of footing, is approximately $0$ $25$ $50$ $100$

The percent reduction in the bearing capacity of a strip footing resting on sand under flooding condition (water level at the base of the footing) when compared to the si...

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152

GATE2018 CE-2: 43
The compression curve (void ratio $e$ vs. effective stress, $\sigma_v^{\text{'}}$ for a certain clayey soil is a straight line in a semi-logarithmic plot and it passes through the points ($e = 1.2; \: \sigma_v=50 \: kPa$) and ($e = 0.6; \sigma_v = 800 \: kPa$). The compression index (up to two decimal places) of the soil is ______

The compression curve (void ratio $e$ vs. effective stress, $\sigma_v^{\text{'}}$ for a certain clayey soil is a straight line in a semi-logarithmic plot and it passes th...

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153

GATE2018 CE-1: 20
In a shrinkage limit test, the volume and mass of a dry soil pat are found to be $50 cm^3$ and $88$ g, respectively. The specific gravity of the soil solids is $2.71$ and the density of water is $1$ g/cc. The shrinkage limit (in $\%$, up to two decimal places is _____

In a shrinkage limit test, the volume and mass of a dry soil pat are found to be $50 cm^3$ and $88$ g, respectively. The specific gravity of the soil solids is $2.71$ and...

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154

GATE2018 CE-2: 10
Which one of the following statements is NOT correct? When the water content of soil lies between its liquid limit and plastic limit, the soil is said to be in plastic state. Boussinesq's theory is used for the analysis of stratified ... fine sand, after applying overburden correction, if the Standard Penetration Test value exceeds $15$, dilatancy correction is to be applied

Which one of the following statements is NOT correct?When the water content of soil lies between its liquid limit and plastic limit, the soil is said to be in plastic sta...

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155

GATE2018 CE-1: 11
The width of a square footing and the diameter of a circular footing are equal. If both the footings are placed on the surface of sandy soil, the ratio of the ultimate bearing capacity of circular footing to that of square footing will be $4/3$ $1$ $3/4$ $2/3$

The width of a square footing and the diameter of a circular footing are equal. If both the footings are placed on the surface of sandy soil, the ratio of the ultimate be...

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156

GATE2018 CE-2: 9
The contact pressure and settlement distribution for a footing are shown in the figure. The figure corresponds to a rigid footing on a granular soil flexible footing on a granular soil flexible footing on saturated clay rigid footing on cohesive soil

The contact pressure and settlement distribution for a footing are shown in the figure.The figure corresponds to arigid footing on a granular soilflexible footing on a g...

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157

GATE2018 CE-2: 33
Three soil specimens (Soil $1$, Soil $2$ and Soil $3$), each $150$ mm long and $100$ mm diameter, are placed in series in a instant head flow set-up as shown in the figure. Suitable screens are provided at the boundaries of the specimens to keep them intact. The values of ... and $0.03$ cm/s, respectively. The value of $h$ in the set-up is $0$ mm $40$ mm $255$ mm $560$ mm

Three soil specimens (Soil $1$, Soil $2$ and Soil $3$), each $150$ mm long and $100$ mm diameter, are placed in series in a instant head flow set-up as shown in the figur...

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158

GATE2018 CE-1: 31
A $0.5 \: m \times 0.5 \: m$ square concrete pile is to be driven in a homogeneous clayey soil having undrained shear strength $c_u=50 \: kPa$ and unit weight, $\gamma = 18.0 \: kN/m^3$. The design capacity of the pile $500$ kN. The adhesion factor $\alpha$ is given as ... pile required for the above design load with a factor of safety of $2.0$ is $5.2$ m $5.8$ m $11.8$ m $12.5$ m

A $0.5 \: m \times 0.5 \: m$ square concrete pile is to be driven in a homogeneous clayey soil having undrained shear strength $c_u=50 \: kPa$ and unit weight, $\gamma = ...

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159

GATE2018 CE-2: 45
A group of nine piles in a $ 3 \times 3$ square pattern is embedded in a soil strata comprising dense sand underlying recently filled clay layer, as shown in the figure. The perimeter of a individual pile is $126$ cm. The size of pile group is $240$ ... of $16 \: kN/m^3$. The negative frictional load (in kN, up to two decimal places) acting on the pile group is _____

A group of nine piles in a $ 3 \times 3$ square pattern is embedded in a soil strata comprising dense sand underlying recently filled clay layer, as shown in the figure. ...

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