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I am a soils engineer who has never worked in a seismic zone 4 before. I now have a project in zone 4 which has some retaining walls to 10 feet high. For granular retaining wall backfill, I generally give an active pressure of 30 pcf for level backfill and increase that value for sloping...

I am a soils engineer who has never worked in a seismic zone 4 before. I now have a project in zone 4 which has some retaining walls to 10 feet high. For granular retaining wall backfill, I generally give an active pressure value of 30 pcf for level backfill and increase that value for sloping...

Is there a formula for estimating the 28 day compressive strength of concrete based on the 7 day result?

Is there a formula for estimating the 28 day compressive strength on concrete based on the 7 day strength?

I have a client who wants to develop a quarry. He has miles of land with different terrain to choose from. Before I start doing test borings all over the place looking for good rock, I would like to read a book (or maybe a chapter in geotech book) on developing a quarry. Any help??

I am looking for a formula or book to help me estimate settlement of shallow spread foundations in cohesive soil using SPT blowcounts or DCP blowcounts.