"Stability of a retaining wall is properly based on the active earth pressure" - Peck, Hanson & Thornburn, Foundation Engineering, Page 424. To fail, it must move, if it moves it developes active state. However, I have seen in some text where the use of At-Rest pressures is recommended for...
SWP used regroutable anchor systems exstensively - 8" was pretty much the practical limit - probably in the industry. The soil surrounding the anchor has some limiting effects. Handling a five strand anchor is not fun. 12" IS HUGE - how many strands / bars? Is this a vertical application...
hokie66 hit it on the nail. For a DOT project, out-of-plumb is not acceptable. Any issue with stability is a public safety concern. Hopefully the pile cap and piles were designed completely independent of the facing wall - ie - the wall could be completely removed and the abutment would remain...
All things left to themselves will become simple. Even treated timber lagging. It is common practice to use untreated mixed hardwood timber lagging in temporary excavation support systems. It is also common practice to remove the top three feet (minimum) of the soldier beams/piles and lagging...
I assume you mean unballanced loading. The trench box should be able to resist full lateral pressure on one side without failing in any manner. It should also be able to resist loading on the lower section (below the lowest brace) without failing in any mode. This allows the box to be set in a...
The walls rigidity will influance the loads - a stiff wall may not defelect enough to mobilize the shear stress in the retained soils. The lateral earth pressure could approach at-rest conditions for a rigid wall. If the wall is reinforced as a cantilever and modeled as a cantilever the model...
You need to perform an analysis for each stage or condition of support. The struts,walers and sheeting would be design for the worst case of any intermediate stage. An apparent pressure envelope is not the usual method used in cofferdams - they typically use hydrostatic pressure distributions /...
