GATE Civil Engineering (CE) 2020 Shift 1 Solved Paper

Question : 35 of 65

Marks: +1, -0

A road in a hilly terrain is to be laid at a gradient of

4.5 \%

. A horizontal curve of radius 100

{m}

is laid at a location on this road. Gradient needs to be eased due to combination of curved horizontal and vertical profiles of the road. As per IRC, the compensated gradient (in \%, round off to one decimal place), is

Your Answer:

Validate

Solution:

According to IRC
Grade compensation

=\table {30+R}/R;75/R\} _{\minm}

Now,

\;{30+100}/{100}=1.3 \%

\;{75}/{100}=0.75 \%

Compensated grade

=4.5-0.75=3.75 \%

But, according to IRC the minimum value of compensated grade is

4 \%

. Therefore answer is

4 \%

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