Soil Mechanics ...

The unconfined compressive strength of an undistributed soil sample is found to be 60 kPa. The same soil is tested in remoulded condition and the unconfined compressive strength is obtained as 12 kPa. It can be classified as a

Match List I (Roller type) with List II (Soil type) and select the correct answer using the codes given below.

The vertical stress at any point at a radial distance r and at depth z as determined by using Boussinesq’s influence factor K_B and Westergaard’s influence factor K_W would be almost same for (r/z) ratios equal to or greater than

A protective filter is provided on the down stream of an earthen dam in order to reduce uplift pressure and erosion of soil. In order to avoid any significant invasion of particles from protected material into the filter, the correct option is

Groundwater flows through an aquifer with cross-sectional and of 1.0 × 10⁴ m² and a length of 1500 m. Hydraulic heads are 300 m and 250 m at the groundwater entry and exit points in the aquifer,  respectively. Groundwater discharges into a stream at the rate of 750 m³/day. Then the hydraulic conductivity of the aquifer is 

In a Newmarks influence chart for stress distribution, there are 10 concentric circle and 30 radial lines. The influence factor the chart is α × 10^-3 .The value of α is (up to 2 decimal places)

The bulk unit weight of a soil strata is 18 kN/m³ and the water content is 20%. The specific gravity of the soil particles is determined as 2.7. The void ratio at the loosest and the densest state is found to be 0.90 and 0.30 respectively. The relative density of the soil strata is ______ (in % up to 2 decimal places)

Two different soil specimens were subjected to the shear strength test. Of which, the first soil specimen failed at the deviator stress of 500 kN/m² when the cell pressure of 400 kN/m² was recorded in the triaxial shear apparatus. The second soil sample with the coefficient of internal friction of 30° was subjected to a direct shear test. The proving ring constant value is 0.0001 N/μm and the soil failed at the constant normal stress of 600 kN/m² when the dial gauge reading was observed to be 50. Take the area of soil sample at failure is 100 cm². What is the ratio of cohesion for the soil specimen 1 and the soil specimen 2?

A clay sample coated with paraffin wax is weighing 700 gm including the weight of the wax. When the sample is dipped in water, the displaced volume of water is 400 ml and the mass of the wax-coated is 30 gms. The specific gravity of wax is 0.80 and the specific gravity of soil particles is 2.7, if the water content of the sample is 18%, the degree of saturation is

A group of 9 piles arranged in a square pattern with diameter and length of each pile as 25 cm and 10 m respectively, is used as a foundation in soft clay deposit. Taking the unconfined compressive strength of clay as 120 kN/m² and the pile spacing as 100 cm center to center, find the load capacity of the group (in kN). Assume the bearing capacity factor N_c = 9 and adhesion factor = 0.75 and a factor of safety against shear may be taken as 2.5.

To design the foundation of dam there is a need to compute seepage loss through the coffer dam. The flow nets were constructed and the results of the flow net study yields number of flow lines to be 11 and number of equipotential lines to be 20. If the head loss due to seepage is 5 m. Then the loss due to seepage of water per meter length of dam per day will be __________ m³. (up to two decimal places). Assume permeability of the dam material to be 6 × 10^-5 m/minute.

A plate load test is carried out on a 45 cm square plate at a depth of 3 m below ground surface on a sandy soil which extends up to large depth. Load settlement values are noted during the test and is shown in the table below:

If the square foundation (4 m × 4 m) is placed at same depth as of plate and carries a load of 240 tonne, then the total settlement of foundation will be ______ mm.

A consolidated undrained test was conducted on a soil sample with cell pressure of 100 kN/m². The deviator stress at failure is 80 kN/m². The cohesion and an angle of internal friction with respect to effective stress is 0 and 25° and with respect to total stress is 0 and 12.5° respectively. The pore water pressure at failure is _____

(in kPa up to 2 decimal places)

The water table in a certain area is at a depth of 4 m below the ground surface. To a depth of 12 m, the soil consists of very fine sand having an average voids ratio of 0.7. Above the water table the sand has an average degree of saturation of 50%. What will be the increase in the effective pressure (in kN/m²) on a horizontal plane at a depth 10 metres below the ground surface if the soil gets saturated by capillarity up to a height of 1 m above the water table? (Assume G = 2.65)