This is a great lecture! It supports my assumptions of how overly conservative retaining wall design is particularly in the residential construction industry.
Very good video. I’m in a graduate geotech class and a lot of these concepts are bit rusty for me. You explain it all in a very concise and thorough way that is understandable.
At 35:39 you hace a mistake in the delta e2 expression. The numerator inside the log is wrong. It should be sigma 0 + delta sigma - sigma_p. Please verify.
Hey Prof Franke, just reviewing this as I'm preparing for the PE structural exam. I appreciate how much effort and care you put into your time as a professor and wish you the best! Thanks for everything.
That was great. Please make some videos about linear time history analysis using Etabs or Sap2000 for practicing engineers. My living area is prone to near-fault earthquakes.
Dr. Franke - thank you for the content. How are the results of the modified proctor actually applied in the field, for situations where the soil won't be disturbed, say at the base of a spread footing. Suppose the optimum moisture is determined, how is a contractor actually increasing or decreasing the moisture % in the field, and to what depth? The layer beneath said depth won't be tested or compacted, isn't the compaction only as good as that beneath layer?
Thank you for the great explanation. The procedure for obtaining soil samples for testing equipment is not clear. Take a soil sample with a rough N value using a standard penetration test. The operation is performed without knowing which depth of soil is suitable for the soil sample. If stones are mixed in, the inspection machine will not work properly. Obtain it at 1cm along with the N value data using an in-situ test machine. At the same time, data on loading, rotation, and settlement amount will be obtained. Perform the calculation to obtain C and φ. At that time, the singularity can be identified as the part that is causing the slope failure. C and φ are design data for renovation and construction, and must also be used as data for disaster prevention.
