Hot GeoThreads
10 of the most replied to GeoThreads from various forums related to geotechnical engineering and engineering geology. If you prefer, check out the most recent GeoThreads.
Top Comment Posters
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Randy Post
(23 comments)
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W. Robert Thompson, III, P.E.
(7 comments)
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Michael Dennis Stagg
(3 comments)
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Elizabeth Cuscino
(1 comments)
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| Tue, 09 Mar 2010 14:42:00 -0800 |
Does anyone have a good reference for designing for foundation scour when building in a flood plane? ... [0 replies]
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| Tue, 09 Mar 2010 12:22:00 -0800 |
We are designing an industrial facility in Canada with a 7 foot frost depth. The facility has a lot of interior equipment foundations. If the facility is heated do these foundations also have to go to the frost depth? ... [4 replies]
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| Tue, 09 Mar 2010 07:57:00 -0800 |
A co-worker and I were discussing the best location for a perimeter drain tile around a foundation. Is it best to place it on top of the footing immediately next to the wall or is it better to hold it away, perhaps beside of and within the same elevation ... [12 replies]
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| Tue, 09 Mar 2010 07:38:00 -0800 |
It seems clear to me that the upward heaving force develops in two ways: 1 frost heave pressure on underside surface of foundation, 2 upward adfreeze force on the side surfaces of foundation AND on the pile perimeter. But when some engineers suggested tha... [4 replies]
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| Mon, 08 Mar 2010 19:03:00 -0800 |
Howdy, I'm looking at the preliminary design of an MSE Wall for a job. I suppose I'm also interested (or atleast the structural eng will be for wall design) in this question for the adjacent concrete retaining wall that forms the backwall of a large rock ... [2 replies]
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| Mon, 08 Mar 2010 15:35:00 -0800 |
It is understood that an augercast pile installed at a batter beneath a recently constructed embankment that is causing long-term consolidation of the subsoils will develop moments along the pile shaft. My question is if anyone is aware of any academic or... [1 replies]
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| Mon, 08 Mar 2010 13:05:00 -0800 |
Hey all, im designing a cofferdam. We have to quantify the seepage but we are missing permeability values. what Ive got here is a soft clay (Cu=30kN/m2), a firm clay (Cu=60kN/m2), stiff clays(100kN/m2). These values have been estimated from SPT N values.... [0 replies]
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| Mon, 08 Mar 2010 10:58:00 -0800 |
I have an elevated timber structure supported on 4x4 timber colums. The columns were embedded in concrete. I want to analyze the overturning of the structure due to the windloading. The way I look at it I have the dead weight of the timber structure + the... [1 replies]
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| Mon, 08 Mar 2010 10:00:00 -0800 |
Anyone familiar with the term "plastic modulus" as it refers to soil? I've never run across that term but suspect it's simply a different term for something more commonly used. ... [0 replies]
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| Sat, 06 Mar 2010 14:41:00 -0800 |
We have a dwelling, which has experienced sudden settlement after 10-12 years of static performance of its foundations. In 2006 the dwelling (built in 95/96) and the surrounding ground (10-15 m in diameter) started to settle, the surface soils receded any... [24 replies]
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| Fri, 05 Mar 2010 16:15:00 -0800 |
We determined the moisture content of frozen marine sediment samples, but the results seem to be higher than some previous testing (average about 20% higher). Is any correction that needs to be applied for salts? Or is there a standard procedure for moist... [1 replies]
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| Wed, 03 Mar 2010 16:20:00 -0800 |
Hi, i have few questions really. I am design an earth dam. I got not really good results from a triaxial tests. it is a 75% sand and the remain of bentonite with kaolinite. i get cohesion from 13 to 296 KPa and phi angle from 3.5 to 40ish. I am using Tay... [7 replies]
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| Wed, 03 Mar 2010 11:33:00 -0800 |
What ia the difference in the plate bearing test between method cnr-146, astm d1195, and bs1397. ... [0 replies]
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| Tue, 02 Mar 2010 22:59:00 -0800 |
Vapor barrier are manufactured from plastic material that tend to be smooth. When the material is places between concrete and the ground surface there is no doubt there is a reduction in friction. In structures where there is risk of sliding the reduction... [1 replies]
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| Tue, 02 Mar 2010 10:13:00 -0800 |
What are the general design considerations when deciding between a shallow foundation vs. piles for a coastal residential foundation design. A colleague is saying you have to go with piles because beach sand does not compact well? do all agree with this? ... [8 replies]
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| Tue, 02 Mar 2010 00:25:00 -0800 |
hi, Who knows a good software to design the raft foundation? i dont want free software. i am asking for something PROFISSIONAL. ... [8 replies]
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| Sat, 27 Feb 2010 15:06:00 -0800 |
Hi, I am writing a report on some lab test.I am trying to find a correct equation for calculating the falling head permeability. I used books like Smith, Craig, Powrie. Each of them gives a different equation. Of course the answer is 10-4 and 10-7. No id... [2 replies]
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| Fri, 26 Feb 2010 15:23:00 -0800 |
I work for a small subcontractor that installs temporary soldier pile and lag walls. We out source all of our engineering and I believe that the methods our structural engineer is using to size our beams may be overly conservative and preventing us from b... [4 replies]
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| Fri, 26 Feb 2010 10:55:00 -0800 |
Hello, I recently came across a formula giving an average value of the coefficient of consolidation from representative values for different layers. Unfortunately I cannot remember where I saw this. Does anyone know something about this formula? ... [2 replies]
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| Fri, 26 Feb 2010 10:32:00 -0800 |
Sorry for the long post with my question. I've got some background in my question so basic soil mechanics won't need repeating. It is common to use granular backfill behind retaining walls instead of cohesive backfill to reduce wall pressures. Reasoning ... [3 replies]
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| Fri, 26 Feb 2010 09:05:00 -0800 |
Hey all, Im designing a cofferdam for the construction of a pad 3.5m x 3.5 m pad foundation, therefore a short term structure. Cofferdam is to be circular. The ground is a fully saturated sitly clay, fairly dense. there is a river about 300m away. In det... [1 replies]
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| Fri, 26 Feb 2010 09:04:00 -0800 |
I have a boring report showing a site on loose to medium sand with no groundwater present. There were borings done in the street at an earlier date with groundwater found at 20 ft below the surface. I know there is not much engineering involved for a 2 fa... [7 replies]
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| Mon, 22 Feb 2010 11:18:00 -0800 |
Does anyone know of a reference that accounts for radiant heating tubes in unreinforced slab on grade design? I'll have 1/2" diameter tubes with 2" cover, but I haven't yet found good information on accounting for them in the structural design. ... [0 replies]
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| Sun, 21 Feb 2010 14:37:00 -0800 |
Hi all, I have a few simple questions on piles sockets, have searched the internet but nothing seems to answer my question. 1.What is the purpose of socketing a pile into rock/clay/sand? 2.What dicates the length of socket? Thanks all. ... [3 replies]
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| Sat, 20 Feb 2010 09:51:00 -0800 |
This question is two folds: 1. Are you aware of such construction (permanet tie-back for slurry wall/basin wall) for a liquid containing basins? good or bad? 2. As this tie-back appears part of the permanent structure, how engineer monitor its corrosion a... [3 replies]
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| Fri, 19 Feb 2010 11:30:00 -0800 |
Does the 2007 CBC state that Lateral Seismic Loads are to be used in the design of retaining walls. I cannot find it anywhere, anyone know what section it is in? ... [2 replies]
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| Fri, 19 Feb 2010 09:56:00 -0800 |
I am using old technique (plotting tangenet to consolidation curve) to calculate Cc and Cr values for Settlement calculation, So I have Consolidation Results from Lab, is there any spread sheet or program available to calculate Cc and Cr Directly..I have... [4 replies]
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| Fri, 19 Feb 2010 08:45:00 -0800 |
I recently bought a house with a block wall foundation. The problem I have is that 3 of the 4 walls are bowing in about 3 inches. There is also a horizontal crack on these walls about mid height 1/4 to 1/2 inch wide. The walls are 7 ft in height from conc... [8 replies]
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| Fri, 19 Feb 2010 06:17:00 -0800 |
Please can someone advise me on the practical methods of controlling ground water pressure in a permanent earth retaining structure. Everywhere i look there is info on temporary structures but not much for permanent. Thanks in advance. ... [9 replies]
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| Thu, 18 Feb 2010 13:58:00 -0800 |
Guy i want to now how i can get the soil properties from Atterberg Limits. I have some triaxial testing done but the results are a bit strange so want to know how do can i compare them with Atterberg Limits?? ... [15 replies]
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| Thu, 18 Feb 2010 12:17:00 -0800 |
I have a project with columns of a drive-thru canopy designed to be set on shallow, isolated footings. However, there is a 10'-0" high utility tunnel that runs directly beneath the canopy. The top of the tunnel is 15'-0" below grade. Even though the canop... [8 replies]
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| Thu, 18 Feb 2010 10:44:00 -0800 |
anybody have a pdf of this? Duncan, J.M. and Buchignani, A.L. (1975) An Engineering Manual for Slope Stability Studies ... [4 replies]
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| Wed, 17 Feb 2010 15:02:00 -0800 |
I have been asked by a client to determine the change in soil strength along a metal shell pile. All the books that I have tell me that in a cohesive soil the strength is reduced during driving and will be regained and increased in some cases say a month ... [3 replies]
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| Wed, 17 Feb 2010 12:13:00 -0800 |
Can anybody tell me the difference between Angle of Internal Friction and the Effective Angle of Internal Friction ... [0 replies]
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| Wed, 17 Feb 2010 08:12:00 -0800 |
Hello We are proposing Contiguous Bored Pile walls as retaining earth for Highway schemes.I was wondering how to hold the soil between the piles.Is there any minimum spacing criteria between the piles so that soil mass is stabilised.What are the drainage ... [2 replies]
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| Wed, 17 Feb 2010 07:44:00 -0800 |
We're trying to resolve the forces acting on a sheet pile wall. If you look at the attached pdf we believe the effective width of the concrete arch and the soil wedge of select structural fill on top of the arch can be analyzed as a line load distributed ... [5 replies]
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| Wed, 17 Feb 2010 02:03:00 -0800 |
Has anyone ever been involved in a project requiring drilling through reinforced concrete, passing through rubble and drilling through concrete again? The goal is to install rock anchors of a length of 35 feet. ... [5 replies]
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| Mon, 15 Feb 2010 15:05:00 -0800 |
Slope W/ Slide 5/ Gstabl7 -Which is the Best Program for SlopeStability ... [3 replies]
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| Mon, 15 Feb 2010 06:15:00 -0800 |
I need good references on the subject matter. I do MSE walls designs and several times need to address the bearing capacity being estimated only for structural concrete walls, and have been asked to evaluate the possibility of over-excavating and reinforc... [1 replies]
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| Fri, 12 Feb 2010 16:10:00 -0800 |
I am a structural engineer working on driving steel pipe piles for an oil sands treatment facilities. Based on the soils report and design drawings, the design embedment of most of the piles range from 20 m to 26 m. The pile top cut-off elev. is about 1.5... [28 replies]
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| Fri, 12 Feb 2010 09:18:00 -0800 |
There seems to be a fair amount of discrepancies when it comes to designing dry stacked natural stone retaining walls. While I have read the federal rockery manual concerning dry stacking with large boulders (250 pounds and up) and it seems there is conse... [10 replies]
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| Sun, 07 Feb 2010 17:21:00 -0800 |
Hi All Using SlopeW 2004, I am trying model water against the slope using the zero strength model, which allows only the stress imparted on the slope into the calc. However I am getting failure through the zero strength material !! anyone ever heard or c... [1 replies]
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| Sat, 06 Feb 2010 07:35:00 -0800 |
I have a soil sample which i have subjected to the liquid limit and plastic limit test. The soil could not be rolled into a 1/8in diameter thread. And with the Liquid Limit test, i could only attain a maximum of 6blows before it closed. Now my question, c... [10 replies]
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| Wed, 03 Feb 2010 09:59:00 -0800 |
Hey all. I am designing a concrete deadman to support an incorrectly built frost wall. The soil it will be built in is a medium stiff clay, but I have no soils report on the project. Is there a way to determine the passive pressure coefficient of the soil... [12 replies]
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| Mon, 01 Feb 2010 11:18:00 -0800 |
Anyone know if PZ40 Gr50 sheet pile is usually readily available in California or generally in US? ... [2 replies]
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| Mon, 01 Feb 2010 04:12:00 -0800 |
Hello Can anyone provide some references on Bored pile construction techniques in sloping ground, Thanks in advance Debasis ... [1 replies]
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| Sat, 30 Jan 2010 17:46:00 -0800 |
The links below have a story regarding a retaining wall failure and landslide. It appears that they may have cut some corners on the engineering or construction. h ttp://ww... [4 replies]
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| Sat, 30 Jan 2010 06:57:00 -0800 |
I am involved in a project. Some designer want to install a diaphram wall in the backfilled and compacted sand of 30 meters. I think it is not feasible for trench stability problem. Do any one of you have similar experiences? Or maybe some suggestion on ... [5 replies]
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