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What is the rule of thumb to apply surcharges on a SOE coming from a building adjacent to the excavation? How much surcharge comes from the building. say a 3 story building

I have read multiple postings about this subject but I don't feel like a conclusion have been achieved. someone said usually the wood lagging is not required to be designed but usually when doing submittals other engineers reviewing retaining walls, want to see calcs done for the lagging or...

I need a little guidance as to how to design a 12' cut on shale with an RQD 7 and below 10' RQD is 45 I cant find to much literature as to designing retaining walls on rock or shale. Do I just assign a high Phi value like 45 to shale and a unit weight of 140 PCF to make it work and find a Kp...

Anyone uses this program on a regular basis. I search on Google but there is not much discussion about it.