Recent questions and answers in Geotechnical Engineering

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Based on the Casagrande's plasticity chart, plasticity index (in $\%$) of inorganic clays having a liquid limit of $40 \%$, ranges between$18.0$ and $28.8$$14.6$ and $28....
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Information related to foundation design is provided in table below.\[\begin{array}{|l|l|}\hline\text{Column 1} & \text{Column 2} \\\hline\text{(I) Converse-Labarre formu...
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A fully saturated sandy soil deposit has water content $20 ~\%$ and specific gravity $2.65$.The critical hydraulic gradient for seepage through the soil to create the qui...
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A shallow footing is subjected to a vertical load. Within the elastic limit of the underlying soil, the TRUE statement(s) is/are:Vertical displacement below a rigid shall...
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For a clayey soil stratum, the time required for degree of consolidation from $25 \%$ to $50 \%$ is $30$ days.The total time (in days) required for $90 \%$ degree of cons...
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The ultimate bearing capacity of a $1 \text{ m}$ wide strip footing is $532.80 \text{ kPa}$ , when it is embedded at $1 \text{ m}$ depth in dry cohesionless soil. The soi...
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A building is proposed in an area having thick deposit of silty clay. The water table is at the ground surface. The saturated unit weight of soil is $18 ~\mathrm{kN} / \m...
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A soil sample has following properties:Natural water content $=30$ $\%$Plasticity index $=40$ $\%$Liquidity index $=50$ $\%$The estimated plastic limit (in $\%$) of the s...
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​​​​​​The name of a person in Column $1$ is to be matched with the test mentioned in Column $2$.\[\begin{array}{|l|l|}\hline\text{Column 1} & \text{Column 2} \\\hline(I)\...
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For a liquid, the permeability of a sandy soil having a void ratio of $0.60$ was determined as $0.14 \mathrm{~cm} / \mathrm{s}$. Considering the same liquid and by using ...
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To obtain undisturbed clay soil sample, an Area Ratio of $10 \%$ needs to be achieved for a thin walled sampling tube. If the outer diameter of the tube is $50.8$ mm , th...
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As per the Rankine's earth pressure theory, which of the following statements is/are FALSE?For the active earth pressure, the inclination of failure plane is $\left(45^{\...
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An infinite slope with slope angle $\beta=22^{\circ}$ consists of soil with the following properties:Unit weight $\gamma=15.72 ~\mathrm{kN} / \mathrm{m}^{3}$Cohesion $c^{...
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A circular pile of $600 \text{ mm}$ diameter and $6 \text{ m}$ length is embedded in a saturated clayey soil. Undrained cohesion of the soil is $80 \text{ kPa}$ . Unit we...
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A group of $25$ circular piles is arranged in $5 \times 5$ uniform pattern in a soft clay soil with equal spacing in both the directions. These are friction piles with ne...
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A shallow strip footing of width $2$ m is embedded at a depth of $1.5$ m below the ground surface in a homogeneous pure clay with an angle of internal friction zero. Cons...
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The internal $(d_{i})$ and external $(d_{o})$ diameters of a Shelby sampler are $\text{48 mm}$ and $\text{52 mm}$, respectively. The area ratio $(A_{r})$ of the sampler (...
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The void ratio of a clay soil sample $\text{M}$ decreased from $0.575$ to $0.510$ when the applied pressure is increased from $\text{120 kPa}$ to $\text{180 kPa}$. For th...
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A homogeneous earth dam has a maximum water head difference of $15 \mathrm{~m}$ between the upstream and downstream sides. A flownet was drawn with the number of potentia...
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The in-situ percentage of voids of a sand deposit is $50 \%$. The maximum and minimum densities of sand determined from the laboratory tests are $1.8 \mathrm{~g} / \mathr...
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A drained triaxial test was conducted on a saturated sand specimen using a stress-path triaxial testing system. The specimen failed when the axial stress reached a value ...
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Consider the statements $\text{P}$ and $\text{Q}$.$\text{P}$: Soil particles formed by mechanical weathering, and close to their origin are generally subrounded.$\text{Q}...
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Pick one or more CORRECT statement(s) from the choices given below, in the context of upstream and downstream cut-offs provided below the concrete apron of weirs / barrag...
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A $6 \: \mathrm{m}$ thick clay stratum has drainage at both its top and bottom surface due to the presence of sand strata. The time to complete $50 \%$ consolidation is $...
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Two soils of permeabilities $k_{1}$ and $k_{2}$ are placed in a horizontal flow apparatus, as shown in the figure. For Soil $1, L_{1}=50 \mathrm{~cm}$, and $k_{1}=0.055 \...
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A $6 \mathrm{~m} \times 6 \mathrm{~m}$ square footing constructed in clay is subjected to a vertical load of $2500 \: \mathrm{kN}$ at its centre. The base of the footing ...
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A clayey soil has a moisture content of $18 \%$, a specific gravity of soil solids of $2.74$, and a degree of saturation of $65 \%$. The soil soaks up water during a rain...
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A single pile with $450 \: \mathrm{mm}$ diameter has been driven into a homogeneous clay layer, which has an undrained cohesion $\left(c_{u}\right)$ of $20 \: \mathrm{kPa...
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The total primary consolidation settlement $\left(S_{c}\right)$ of a building constructed on a $10 \mathrm{~m}$ thick saturated clay layer is estimated to be $50 \mathrm{...
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A designer used plate load test to obtain the value of the bearing capacity factor $N_{\gamma}$. A circular plate of $1 \: \mathrm{m}$ diameter was placed on the surface ...
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A $4 \times 4$ group pile, with each pile $20 \: \mathrm{m}$ long and $500 \: \mathrm{mm}$ in diameter, is installed in a square pattern in a clayey soil, as shown in the...
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The results of a consolidated drained triaxial test on a normally consolidated clay are shown in the figure. The angle of internal friction $\sin ^{-1}\left(\frac{1}{2}\r...
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​​​​​The standard plasticity chart for the classification of a fine-grained soil is shown in the figure. As per the Indian standard soil classification system, $X$ repres...
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Which of the following statements is/are INCORRECT?As the depth of the ground water table from the ground surface increases, the effective stress in the soil decreases.Bu...
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A soil sample is underlying a water column of height $h_{1},$ as shown in the figure. The vertical effective stresses at points $\text{A, B,}$ and $\text{C}$ are $\sigma’...
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A square concrete pile of $10\: m$ length is driven into a deep layer of uniform homogeneous clay. Average unconfined compressive strength of the clay, determined through...
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From a flow-net diagram drawn under a concrete dam, following information are obtained: (i) The head difference between upstream and downstream side of the dam is $9 \: \...
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A drained direct shear test was carried out on a sandy soil. Under a normal stress of $50 \mathrm{~kPa},$ the test specimen failed at a shear stress of $35 \mathrm{~kPa}$...
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The contact pressure distribution shown in the figure belongs to arigid footing resting on a cohesionless soil.rigid footing resting on a cohesive soil.flexible footing r...
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Which one of the following saturated fine-grained soils can attain a negative Skempton's pore pressure coefficient $\text{(A)}$?Quick claysNormally-consolidated claysLigh...
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