I would like some guidance for permanent erosion control measures for an existing rocky slope at an inclination of 2H:1V. The maximum slope height is 25 feet. Parallel horizontal benches are not feasible due to site constraints. Slope is a structural fill slope built with a rocky fill...
tbone73:
The transfer of load will be a function of how the additional footing is connected to the existing footing. Will it be "structurally connected" to act monolithically? If so, then treat the combined footing as one footing. If not, then you have a different animal.
Settlement for the...
What are you filling over? Is it a soft, firm, stiff or very dense stratum?
Reason being, is that in the lab (at least our lab), we set our proctor molds on a 1 cubic foot block of concrete. This means we are compacting against a solid mass. This, however, may not be the case in the field...
Just a suggestion that is non-technical: I would ask the owner for all photos ever taken in the house and particularly the addition. See if you can see the history of the cracks in the photos. If the owner is reluctant to show you any pictures, do not accept the project. I do not know the...
I use it very sparringly, but keep it in my arsenal much like my pocket penetrometer. I find it useful when probing for soft soils on slope faces or within footing trenches that have been exposed to inclement weather after they were inspected.
4" inches of an Aggregate Base Course stone should be fine provided the soil subgrade is stiff, properly evaulated by the special inspections firm and passes a proofroll. You are talking more about a "static slab on grade" versus a warehouse slab on grade with fork lift traffic.
In my experience, I have used helical piers for foundation underpinning and to help arrest isolated areas of building settlement.
I will point out that installation is usually performed by monitoring the torque from the surface. Therefore, it is critical that good subsurface information from...
Run a grain size analysis on the native soil adjacent to the washrock. Using the grain size analysis to spec an appropriate filter fabric to place between the wash rock and native soil.
I sometimes see 90% Standard Proctor compaction for non-structural landscaped areas on the civil engineering drawings. 95% was cited on for all structural areas. Perhaps, this is what the post was alluding to...
Engage your project team to discuss the differences in building design between Site Classes. A single-story prefab building will likely not have much difference in cost between a design category D and a design category C. However, a large industrial warehouse building with tilt-up panel walls...
Site specific laboratory testing or insitu specialty testing (pressuremeter, etc.) to more accurately estimate the potential settlement is far cheaper than dealing with a magnitude of settlement after construction that is larger than predicted based solely on soil test borings. In my humble...
To respond to the original question, the bearing capacity should be determined for the structure (building, wall, etc.) through a geotechnical investigation. This investigation will include soil test borings, CPT borings, laboratory testing and engineering analyses specific to the structure and...
To piggy-back on fatdad, the amount (or depth) of new fill placed to reach final grades is also very important and critical to settlement calculations. There is big difference in estimating foundation settlement for a site where 4 feet of fill is to be placed to reach final grade versus a site...
"adjust" numbers to correct for proctor changes...to "facilitate movement on the job".
Those phrases would scare the heck out of me if I were a principal at your firm.
