Minimum slope limit for lateral spread
Minimum slope limit for lateral spread
(OP)
Hello.
What is the minimum slope limit for lateral spreading to occur? The MLR by Bartlett and Youd (1993, 2002) gives limits at 1% m while some other publications have limits are at 0.25%.
The site in my analysis has a slope of 0.01% very far from any body of water, which i'm arguing that lateral spread will not occur.
Thanks for the help.
What is the minimum slope limit for lateral spreading to occur? The MLR by Bartlett and Youd (1993, 2002) gives limits at 1% m while some other publications have limits are at 0.25%.
The site in my analysis has a slope of 0.01% very far from any body of water, which i'm arguing that lateral spread will not occur.
Thanks for the help.





RE: Minimum slope limit for lateral spread
How about that deflated foot ball owned by the Patriots?
RE: Minimum slope limit for lateral spread
RE: Minimum slope limit for lateral spread
https://books.google.it/books?id=3j5PAIBdiKQC&...='lateral%20spreading'%20minimum%20slope&f=false
Anyway, am I missing something?
0.1% means a 1/1000 slope, that is, 0.057 degrees of slope, a quantity which is very small and maybe within the error of the surveying methods (I'm no surveyor, so I'm just guessing).
Your slope 0.01%= 0.006° of slope, a 1.75 millionth of a radian, to all practical effects is a flat surface, I don't know if such accuracy in measuring the angle of the topographic surface is granted.
It would seem that your surface is a flat one, has it a meaning to speak about lateral spreading?
www.mccoy.it
RE: Minimum slope limit for lateral spread
I was wondering if the MLR models for predicting ground displacements would cover as low as S = 0.01%. Otherwise, from my knowledge, a flat surface would fall on ground oscillation behavior
Thanks for the reference, I will look that up.
RE: Minimum slope limit for lateral spread
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
[IMG http://tinyurl.com/7ofakss]
Need help writing a question or understanding a reply? forum1529: Translation Assistance for Engineers
Of course I can. I can do anything. I can do absolutely anything. I'm an expert!
There is a homework forum hosted by engineering.com: http://www.engineering.com/AskForum/aff/32.aspx
RE: Minimum slope limit for lateral spread
By the way, after your post I'm just now noticing that, with low y/x ratios, starting from about 1/200 downward, the ratio is exactly equal to the angle in radians in the Excel 2013 spreadsheet.
i.e.: arctan (1/100) = 0.0099997
arctan (1/200) = 0.0050000 = 1/200
arctan (1/10000) = 0.000100 = 1/10000
So, Hunter64's slope 0.01% = 0.0001 = 1/10000 slope = 1/10000 radians =0.1 milliradians = 100 microradians.
This is not the spreadsheet section but I Wonder if there is anything wrong with that. I get 0.006° with a 1/9550 Y/X ratio, whereas arctan(1/10500)= 95.2 microradians
www.mccoy.it
RE: Minimum slope limit for lateral spread
RE: Minimum slope limit for lateral spread
RE: Minimum slope limit for lateral spread
IF its completely flat i don't think there is a problem
RE: Minimum slope limit for lateral spread
I've seen cracking on flat sites which can look like lateral spreading however this is mainly due to a drastic change in ground conditions
RE: Minimum slope limit for lateral spread
I'm still wondering about these measurements of an irregular topographic surface, taken with astronomical precision.
That's about a 2 milliradians angle, 2 meters of height over one kilometer of horizontal lenght, evidently it's an average over a large lenght of say, a few kilometers. So I would answer to the OP that, in this context of a wide alluvial plain or whatsoever plain, less than a 1/1000 slope angle averaged over a few kilometers sounds as a reasonably safe lower bound of the occurrance of lateral spreading.
It would also be interesting to carry out some sensitivity analysis over the formulas cited in the article. The formula (11) is logDh=0.430+0.442logS Assuming that's decimal logaritms:
Which means that slope, even if very small, has a significant effect by itself. But then we should carry out the sensitivity anlysis and scale out the effect of slope with the other variables, as in formula (20c).
www.mccoy.it
RE: Minimum slope limit for lateral spread
RE: Minimum slope limit for lateral spread
I'd look at the problem the other way around. The original surface (nearly) perfectly flat (assuming the slope percent numbers are valid). Therefore, any "almost liquid" substance poured onto the surface is going to keep spreading until it hits a curb, dam, or block. Or a ditch, drain, or opening. Then it will fill the opening. That is, the OP's problem is that nothing will stop a near-liquid from spreading at in every direction.