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At what angle do the fractures appear to the lines of tensile stresses?

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At what angle do the fractures appear to the lines of tensile stresses?

(a) 180°

(b) 90°

(c) 45°

(d) 60°

I have been asked this question during an online interview.

This intriguing question comes from Occurrence of Joints in chapter Joints and Jointing of Engineering Geology

1 Answer

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The correct answer is (b) 90°

The explanation: When the strength of the rock is overcome, fractures appear at right angles to the lines of tensile forces.

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