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Pick the rock considered as soft rocks for tunnelling.

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Pick the rock considered as soft rocks for tunnelling.

(a) Granite

(b) Gabbro

(c) Basalt

(d) Shale

The question was posed to me in an online quiz.

This question is from Geological Investigations topic in division Tunnels of Engineering Geology

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The correct option is (d) Shale

Explanation: Rocks considered as hard and crystalline are granites, syenites, gabbros, basalts and all the related igneous rocks, sandstones, limestones, dolomites, quartzites etc. However the soft rocks include shales, friable and poorly compacted sandstones, chalk and porous varieties of limestones and dolomites, slates and phyllites with high degree of cleavage.

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