GATE CE 2024 Paper 1 — page 19

Questions 55–57 of 65. Imported answers require review unless explicitly marked reviewed.

A soil sample was consolidated at a cell pressure of 20 kPa and a back pressure of 10 kPa for 24 hours during a consolidated undrained (CU) trial test. The cell pressure was increased to 30 kPa on the next day and it resulted in the development of pore water pressure of 1 kPa. The soil sample failed when the axial stress was gradually increased to 50 kPa. The pore water pressure at failure was recorded as 21 kPa. The value of Skempton’s pore pressure parameter B for the soil sample is ____________ (rounded off to 2 decimal places).

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The ordinates of a 1-hour unit hydrograph (UH) are given below.

Time (hours)	0	1	2	3	4	5
Ordinates of 1-hour UH (m /s)	0	13	50	80	95	85

Time (hours)	6	7	8	9	10	11
Ordinates of 1-hour UH (m /s)	55	35	15	10	3	0

These ordinates are used to derive a 3-hour UH. The peak discharge (in m

/s) for the derived 3-hour UH is ______________ (rounded off to the nearest integer).

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A standard round bottom triangular canal section as shown in the figure has a bed slope of 1 in 200. Consider the Chezy’s coefficient as 150 m

/s.

Diagram for Civil Engineering question 57

The normal depth of flow, y (in meters) for carry a discharge of 20 m

/s is ____________ (rounded off to 2 decimal places).

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2024 · Paper 1

Question 55

Question 56

Question 57