1. The Maine DOT is constructing a section of the E-W highway along a 25 ft. high natural rock embankment. The slope of the rock face is 1.5H:IV. The DOT has requested a preliminary investigation of the factor of safety against slope instability. Rock cores gathered during the subsurface investigation indicate the predominant orientation of discontinuities varies between 9 and 19 deg. They are targeting a factor of safety of at least 1.5. Assuming a planar failure surface that extends through the toe and a friction angle of 25 degrees along the discontinuities: a. Plot the FS on the vertical axis for failure inclinations ranging between 9 and 19 degrees (horizontal axis). Is the required factor of safety satisfied? (Hint: create a spreadsheet and show one example calculation). H = 25 ft 7777 T 1.5 Traffic Surcharge Pressure Failure surface Inclination, B Rock o'= 25 deg Y = 145 pcf

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Principles of Seepage

In hydrology, when water flows down in a pore or crack of unsaturated soil due to gravity, the deep layer of soil is called seepage. It is the slow movement of water in the soil layer. Seepage is mainly found near hydraulic structures and is responsible for the stability of earthen-type hydraulic structures.