Soil Properties from RQD?
Soil Properties from RQD?
(OP)
I am designing a short (6' and less) Reinforced Earth wall in a cut situation. The reinforced fill will be crushed stone to minimize the reinforceing embedment length.
The retained material is a poor quality limestone, with an RQD (Rock Quality Designation) of 8 to 25. A Texas Cone Penetrometer advanced 0" at 100 blows.
Does anyone have any reccomendations as to what phi angle I should apply to the retained material? Would a value of 36 to 38 be appropriate?
Thanks in advance.
The retained material is a poor quality limestone, with an RQD (Rock Quality Designation) of 8 to 25. A Texas Cone Penetrometer advanced 0" at 100 blows.
Does anyone have any reccomendations as to what phi angle I should apply to the retained material? Would a value of 36 to 38 be appropriate?
Thanks in advance.





RE: Soil Properties from RQD?
Since you used the Texas cone, this project must have TexDOT money! No self-respecting geotechnical engineer uses it - but we must do the @#%&?! test on TexDOT jobs!! [calmer] You have my condolences. [aggravated again] Why do "they" insist on using this damn tool in rock?! It's stupid!
[Focht3 descends from his soap box]
Where is your site? (I'm in San Antonio.) How does the aggregate classify (per TexDOT)? How angular? What is the clay fraction and/or PI?
My initial reaction is to use only 32 or 33 degrees - the wall is short. Do you have an encroachment problem?
RE: Soil Properties from RQD?
RE: Soil Properties from RQD?
ITS LIMESTONE, be more worried ABOUT sinkholes!!!! USe a more conservative phi angle.