road crossing design
road crossing design
(OP)
We have a road embankment planned to go over our pipeline which would increase depth of cover over the pipeline by approx. 8m bringing total cover to 10m. Typically we would use API 1102 but have heard this is limited to shallow depths only i.e. <3m. Is anyone aware if API 1102 is still usefull when at 10m depths..? What alternative method could be used..?
Many Thanks
Many Thanks





RE: road crossing design
However usually the issue in these situations is what is the impact on ground settlement when this huge extra load compresses the ground. This can literally shear your pipeline if the ground settlement is anything close to significant and you need to do a full stress analysis and not just circumferential stress which is what 1102 looks at.
Unless you're already in bedrock, you may well need a concrete bridge erected within the embankment to prevent this compaction or divert the line.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: road crossing design
Independent events are seldomly independent.
RE: road crossing design
It looks like some of the curves are limited to 3.0m depth but these could be interpolated to lower valves for deeper pipes. 1102 doesn't appear to be limited to circumfrencial stress only. It does include an effective stress check with the longitudinal expand stress. There is no bending stress though - but in our case there is no bending.
Thanks
RE: road crossing design
Independent events are seldomly independent.
RE: road crossing design
Its up to you, but as the incumbent resident of the land, you can make the road builder do lots of things to protect your pipeline....
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: road crossing design
RE: road crossing design
In terms of bending then you will need to plug this into a combined stress analysis. Also look at the shear values, especially if the embankment will be quite steep.
Usually the difficulty is getting a geo tech engineer to tell you how much the soil is going to compact.....
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: road crossing design
RE: road crossing design
Independent events are seldomly independent.