Gneiss Rock - Soil testing engineering | Eng-Tips
2012年7月25日 · So gneiss is effectively a granite which has undergone enormous compression under ductile conditions (deep in the earth a long time ago), such that it's mineral constituents are now strongly aligned, or "foliated". The foliation is usually produced by mica. The term "gneiss" is very generic, and covers a whole family of layered, granite-like rocks.
Gneiss Rock - Soil testing engineering - Eng-Tips
2019年10月29日 · I would not agree that the genesis for gneiss is metamorphosed granite. Well, in the felsic bands, we do often get a granite-like texture. There can be a lot of biotite in gneiss. Such layers can be friable. So, I'd rather get LA abrasion data and base my conclusions on the performance of the actual rock supply. f-d . ípapß gordo ainÆt no ...
rock anchor in Gneiss w/ Rec60%&RQD47% - Eng-Tips
2006年1月4日 · I am designing the rock tiedown anchors to take uplift load of the footing due to temperature load. At the site boring, 2 rock corings were conducted, both had a 2' of void out of 5' run, that implied a Rec 60%. The RQD is 47%. Rock is Gneiss. Unfortunately, due to the technical difficulty the boring had to end there.
Footing and Foundations on surface Bedrock - Eng-Tips
2009年8月23日 · Agree with GPT - unless there is a propensity of the rock to swell/shrink due to frost (e.g., Queenston Shale). It sounds as if the rock is so close to surface that you should be able to tell if the upper surface is affected by frost or not. Funny how codes should be the "guiding light" but put all into a restrictive box . . .
Determining depth of zone of influence - Foundation engineering
2008年4月28日 · Thank you for taking time to answer what I hope is a basic question. I am trying to figure out how far down the zone of influence for a footing extends. I borrowed a CE Reference Manual (Lindeburg) and came across a formula that gives me area of the zone of influnce: A=((B+2(h cot 60))+((L+2(h...
Volume of Dirt per Tri-Axle Truck - Eng-Tips
2011年11月26日 · A tri-axle dump body will be more on the order of 18-22 cy. Most dump bodies are limited to 96 inches wide because of road clearance issues.
Civil / Environmental Engineers - Eng-Tips
2024年6月25日 · Congratulations waross on being selected by the Eng-Tips community for having the most helpful posts in the forums last week.
difference among engineering fill, select fill, structural fill, and ...
2013年2月15日 · rock fill - rocks . Upvote 0 Downvote. Aug 13, 2016 #13 Okiryu Civil/Environmental. Sep 13, 2013 1,094 JP ...
Aggregate Base Density Data - Earthwork/grading engineering
2005年5月28日 · Several sources state that "most natural" aggregates have particle densities between 150 and 181 (lb/ft^3). In the Civil Engineering Reference Manual (CERM), under chapter 48, "Properties of Concrete and Reinforcing Steel" Pg. 48-2, "Aggregate" states that, "Most sand and rock aggregate has a specific weight of approximately 165 (lb/ft^3).
Converting CBR to Bearing Capacity - Foundation engineering
2003年7月8日 · ashjun is correct - you can get CBR values of over 100 for stabilized materials. But the AASHTO design guides were developed assuming the CBR of a crushed rock would not exceed 100, so the direct use of values over 100 in a design sense is questionable.