Explore topic-wise InterviewSolutions in .

A Clayey soil has liquid = $W_L$; plastic limit = $W_P$ and natural moisture content = w. The consistency index of the soil is given by

In an unconfined compression test on saturated clay, the undrained shear strength was found to be $6t/m^2$. If a sample of the same soil is tested in an undrained condition in a triaxial compression at a cell pressure of $20t/m^2$, then the major principal stress at failure will be:

1. 8.93

If ${}^{\prime }{s}^{\prime }$ is the shear strength, ${}^{\prime }{c}^{\prime }$ and $\Phi$ are shear strength parameters, and ${}^{\prime }{\sigma }_n^{\prime }$ is the normal stress at failure, then Coulomb's equation for shear strength of the soil can be represented by

1. 1

The number of flow channels and head drops is 4 and 12 respectively. If the difference in the up-stream and down-stream water levels is 3 m, what is the discharge per meter width of a sheet pile, if k = 0.1 m/s .

1. 0.1

1. 37.04

1. 0.5

For an anisotropic soil, permeability in x and y direction are $k_{x}and{k}_y$ respectively in a two dimensional flow. The effective permeability $k_{eff}$ for the soil is given by

A stratum of soil consists of three layers of equal thickness. The permeability of both the top and the bottom layers is 10${}^{-4}$cm/s; and that of the middle layer is 10${}^{-3}$ cm/s; then the value of the horizontal coefficient of permeability for the entire composite of the soil layers is

1. 0.71

Match List-I {Type of shear tests) with List-II (Mohr circle and its envelope) and select the correct answer using the codes given below the lists:

List - I	List - II
A. Udrained test on normally consolidated saturated clays
B. Consolidated undrained test on normally consolidated saturated clays
C. Drained tests on saturated cohesive soil
D. Unconfined test on clays

A dam is to be constructed on a sandy soil which has coefficient of permeability $10\times {10}^{-4}cm/sec$ in horizontal direction $2.5\times {10}^{-4}cm/sec$ in vertical direction. The dam is expected to impound 7.5 m of water. Flow net drawn on transformed section yields flow channels as '6' and drops are 15 only. The seepage loss per metre length of dam if water on downstream is 0.5 m

The coefficient of permeability of a soil is 5 $\times$ ${10}^{-5}$ cm/sec for a certain pore fluid. If the viscosity of the pore fluid is reduced to half, the coefficient of permeability will be

1. 3.8

1. 105.216

1. 500

In a drained triaxial compression test conducted on dry sand, failure occurred when the deviator stress was 218$kN/m^2$ at a confining pressure of 61 $kN/m^2$. What is the effective angle of shearing resistance and the inclination of failure plane to major principal plane?

1. 33.75

1. 1.86

For a sheet pile wall constructed in a soil having effective grain size = 0.1 mm, the difference of the upstream and downstream water levels is 3 m. If the flow net drawn for the problem yields 2 as the ratio of number of head drops to number of flow channels, then what is the discharge in unit of m${}^3$/s /m length of sheet pile wall?

For a triaxial shear test conducted on a sand specimen at a confining pressure of 100$kN/m^2$ under drained conditions, resulted in a deviator stress $({\sigma }_1-{\sigma }_3)$ at failure of 100$kN/m^2$. The angle of shearing resistance of the soil would be

A vane shear test was conducted to determine undrained cohesion of soft clay. The vane was 11.25 cm high and 7.5 cm across the blades. The equivalent torque recorded at the torque head at failure was 312.5 kg-cm. What will be the undrained cohesion of the soft clay ?

1. 0.042

A cylindrical soil specimen of saturated clay, $3.50cm$ diameter and $8cm$ length, is tested in an unconfined compression testing machine. The specimen failed under a vertical load of $50kg$ together with an accompanying additional deformation of $8mm$. What is the unconfined compressive strength of this clay?

In a falling head permeability test on a soil, the time taken for the head to fall from $h_0$ to $h_1$ is t. The test is repeated with same initial head $h_0$, the final head h' is noted in time t/2. Which one of the following equations gives the relation between h'. $h_0$ and $h_1$?

1. 314

1. 0.72

1. 74.28

Match List-I (Field problems) with List-II (Type of laboratory shear test) and select the correct answer using the codes given below the lists:

A dry sand specimen is put through a triaxial test. The cell pressure is $50kPa$ and the deviator stress at failure is $100kPa$, the angle of internal friction for the sand specimen is

If during a permeability test on a soil sample with a falling head permeameter, equal time intervals are noted for drop of head from ${}^{\prime }{h}_1^{\prime }to{}^{\prime }{h}_2^{\prime }$ and again from ${}^{\prime }{h}_2^{\prime }to{}^{\prime }{h}_3^{\prime }$, then which one of the following relations would hold good?

1. 1771

Which one of the following diagrams represents the effective pressure distribution for a saturated soil mass of depth 'z' submerged under water of height ${}^{\prime }{z}_1^{\prime }$ above its top level (${\gamma }^{\prime }$= submerged density of soil ${\gamma }_{sat}$ = saturated density of soil and ${\gamma }_w$ = unit weight of water)?

A $CD$ triaxial test was conducted on a granular soil. At failure $\frac{\sigma {‘}_1}{\sigma {‘}_3}$ was $3.0$. The effective minor principal stress of failure was $75kPa$. The principal stress difference at failure will be

In the fig. shown aside, the head (h) required to cause quick condition is

Which one of the following correctly represents the dry unit weight of a soil sample which has a bulk unit weight of ${\gamma }_t$ at a moisture content of W%?