My understanding is that high strength concrete increases the allowable stress during PSC pile driving. What are other Pros and cons of using high strength concrete for PSC pile? Is it economic? Thanks!
I am looking for any research paper or technical document to determine how deep a post (T-post or wooden post) need to be driven based on height, fence type, soil type, lateral load on the post etc. for any fence (silt fence, chain-link fence etc.). My understanding is that industry standard or...
As Sieve analysis with hydrometer test ASTM D422 was replaced by D6913 (sieve analysis) and D7928 (hydrometer), how do you present the result. Do you combine both result and present in one grain size distribution plot, or use two separate plots for sieve analysis and hydrometer part. Is there...
Subsurface encountered a very dense sand layer about 20' below ground level. Instead of predrilling and using PSC section, a composite pile with 20' PSC section and 40' HP section was recommended. Wondering if anyone have this kind of pile driving situation. What kind of challenges may show up...
I am debating which hammer size should be more practical in this scenario. A concrete square pile need to be driven to 50' below ground. Mostly silty-sand material. It is reported that shaft resistance of the pile 450 kips and end bearing 600 kips at 50' depth, so total 1050 kips. If we consider...
I have got a soil profile that has WOH/24" blow sand from 30' to 60' below the ground level. Usually min of 28 degree friction angle is being used for very loose sand in the area where I practice.
Would like to hear what friction angle can be used for this layer? Should we consider zero skin...
I am trying to find out how GRLWEAP calculates the percentage of shaft resistance during bearing graph analysis. I looked at GRLWEAP background report and help manual but wasn’t able to figure out.
Any guidance or reference. TIA.
Is there any guidance/reference to determine when end bearing of H-Pile should be ignored? Recently I found some driven H-pile design that ignored end bearing at all though the soil is dense sand. As a result the pile length becomes higher. Appreciate if you share your experience. Thanks
Here is the situation:
5' fill will be placed on an existing 25' wide road embankment. SPT N values are 10-12 in upper 5' which is basically sand and existing embankment. Below that N value is like 2 to 3 for next 40' sand and then very dense 50+ blow sand. Groundwater is at 5' from the...
It might be very basic however would like to ask.
Can someone share some literature or explain the mechanism of how driven pile is gaining more capacity over time like after several days of driving? Is there any way to determine how many minimum days need to wait to do PDA after driving. All I...
Wondering where is the location ( say 20' or 10' from the pile top) of maximum stress, a PSC pile would experience during driving. The literature I got so far says that most compression stresses are close to top of the pile where hammer hit the pile, and most tensile stresses are at the middle...
I have a consolidation result (Sample depth 26’, groundwater at 3’from existing grade) that shows the soil is overconsolidated with Pc=7.5 ksf. The test was performed as loading 0.1, .25, .5, 1, 2, 4, 1, .25, .5, 1, 2, 4, 8, 16, 4, 1, .25 ksf. Lab test shows soil type is CL, natural moisture...
Is there any guideline or design manual to design Wick Drain - how deep they need to go, spacing, loading and waiting time? Would Consolidation test result useful to determine that, how?
