In a certain railroad layout of the subgrade, it was decided to connect a - 5%...

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In a certain railroad layout of the subgrade, it was decided to connect a - 5% grade with + 3% grade by a 140 m vertical parabolic sag curve. In the actual construction work, it was found out that the grade intersection at station 12 + 000 falls in the rocky section with an outcrop of 1.6 m directly above the grade intersection. To avoid rock excavation, it is deemed necessary to design the length of vertical curve in such a way that it will just pass over the rock without altering the position of PVC. Determine the new stationing of PVT and its corresponding change in elevation to satisfy the required condition. In a certain railroad layout of the subgrade, it was decided to connect a - 5% grade with + 3% grade by a 140 m vertical parabolic sag curve. In the actual construction work, it was found out that the grade intersection at station 12 + 000 falls in the rocky section with an outcrop of 1.6 m directly above the grade intersection. To avoid rock excavation, it is deemed necessary to design the length of vertical curve in such a way that it will just pass over the rock without altering the position of PVC. Determine the new stationing of PVT and its corresponding change in elevation to satisfy the required condition.

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Question 1 In a certain railroad layout of the subgrade it was decided to connect a 5 grade with 3 grade by a 140 m vertical parabolic sag curve Answer 1 The vertical parabolic sag curve is used to co... View the full answer