PE Exam Practice Problem #73: Soil Mechanics | AASHTO Slope Stability скачать в хорошем качестве

PE Exam Practice Problem #73: Soil Mechanics | AASHTO Slope Stability

Welcome to SolvedIn6: Free practice problems for the Professional Engineering Exam! Each question is styled after those created by the NCEES, and is usually solved in under 6 minutes, which is the average time you will have to solve each question on the Professional Engineering Exam. In this question, we are asked to find the steepest allowable foreslope for a drainage ditch next to a road. We are asked to do this using the AASHTO Roadside Design Guide (making this question viable as either a geotechnical OR transportation question). It can be solved very quickly. 1. First, identify which slope is the foreslope, and which is the backslope. In our case, the foreslope will be the slope nearer the road, and backslope will be the slope farther away. 2. Given that the slope of 1:5 is provided for the backslope, we will start from that slope on the right side of the Y axis when we go to our AASHTO Roadside Design Guide provided. 3. Drawing a horizontal line from the backslope to the preferred channel cross-section, we can then draw our next line up or down to the foreslope, depending on the format in which you want your answer. In this case, the problem asks for the answer in units of (V/H), so we will draw down. 4. Given that our answer lies between two different answers, we will opt for the more conservative of the two numbers. In this case, that means selecting the shallower of the two slopes. If you would like more geotechnical/soil mechanics practice problems, please check out the rest of the playlist which this video is part of. Please note that newer versions of the reference manual may have been released since this video was recorded. The search terms are usually still correct, but the page numbers listed in the video will be different.