Q94
Maximum unsupported span is related to excavation support ratio [ESR] and 'Q' of Barton's classification by the formulae.
A.
3[ESR]Q0.2
B.
2[ESR]Q0.2
C.
3[ESR]Q0.4
D.
2[ESR]Q0.4
AnswerAnswer: Option D
Solution
Answer: Option D
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