Drilled shafts in limestone
Drilled shafts in limestone
(OP)
What is a good resource for design and analysis of drilled shafts in limestone? Or any type of foundation in limestone, for that matter. A little background - I've been designing foundations (among outher things) for 2 years, and have just moved from Louisiana to Texas, and limestone is a material with which I've not dealt. Any help would be appreciated. Thanks...





RE: Drilled shafts in limestone
The installation I'm familiar with is a matter of drilling the main shaft to the limestone bedrock and then drilling a smaller shaft, approx 6" smaller diameter to provide a bit of a shoulder. The smaller shaft is drilled to the depth required to provide the necessary surface area.
Sometimes the end bearing is used in conjunction with the friction, but best to check with a local geotekkie to get an opinion due to the differences in moduli for shear and compression.
Also sometime a small 2" drill is used to determine if there is soundness in the limestone to a suitable depth. Again local practice could dictate this.
RE: Drilled shafts in limestone
RE: Drilled shafts in limestone
I have worked in Texas a little but I am aware that just about everything (in the bridge business) down there is drilled shafts. This probably keeps the cost down.
RE: Drilled shafts in limestone
RE: Drilled shafts in limestone