3. Figure on next page shows a sandstone rock with distinct bedding planes that

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3. Figure on next page shows a sandstone rock with distinct bedding planes that are dipping towards one direction. The solid black lines represent cuts to be made in the rock in connection with a highway construction project. Compare the configurations shown in Fig (a) versus Fig (b). Would one of these configurations preferable to the other in terms of providing better stability to the excavated slope? Explain your answer. 4 points (a) Soil deposits are broadly classified into two categories: (a) Residual soil and (b) 4. Transported soil. Differentiate between these two categories of soil. (b) Transported soils are further sub-divided into several different categories based on mechanism of transportation. Name four such categories and provide a brief description of the mechanism of transportation corresponding to each category. 5 points

Explanation / Answer

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Due to time and other constraints the first question in the sequence is answered.

A 3] In the figure a, the cut is proposed to be along the dip ( though inclined at some dip angle) whereas in figure b, the cut for the proposed highway is in the direction perpendicular to the dip.

As we also know that dip is perpendicular to strike. Thus we can also compare it as in the figure a, the cut is proposed to be perpendicular to the strike ( though inclined at some strike angle) whereas in figure b, the cut for the proposed highway is in the direction to the strike.

Whenver the cut is made perpendicular to the direction of the dip, there is greater exposure of the thickness of the layers and thus it can be said that figure b is better than figure a.

Hence, also in terms of better stability condition to excavated slope figure b is better than figure a.

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