How many piles should be tested?
A general rule of thumb for testing rates can be summarised as follows: • Dynamic Pile tests; 10 – 15% of working piles (Case only) • 20% CAPWAP or SIMBAT analysis of Dynamic Tests carried out • 1 Preliminary Static Test pile per 250 piles..
What is the maximum allowable settlement for a pile?
Pile settlement analysis estimated that total settlement value was 15.6 mm, including 2.1 mm settlements of elastic deformation of pile from vertical compressive loads. In general, pile settlement should not be more than <2%D (where D is a diameter of the pile).
What is a working pile?
It covers vertical and raking piles tested in compression (i.e. subjected to loads or forces in a direction such as would cause the pile to penetrate further into the ground) and vertical or raking piles tested in tension (i.e. subjected to forces in a direction such as would cause the piles to be extracted from the …
What is allowable settlement?
The allowable settlement is defined as the acceptable amount of settlement of the structure and it usually includes a factor of safety.
How is concrete piling done?
Concrete piles are precast, that is, made at ground level, and then driven into the ground by hammering – more on that later. Steel H-piles can also be driven into the ground. These can take very heavy loads, and save time during construction, as the pile casting process is eliminated.
How is pile working load calculated?
Step 2: compute the ultimate end bearing capacity (acting as individual piles). Ultimate end bearing capacity in clay = Nc × C × pile tip area (Nc = 9). Ultimate end bearing capacity in soft clay = 9 × 120 × π × diameter2/4 = 848.2 lbs/per pile. Total ultimate bearing capacity per pile = 76,920 + 848.2 = 77,768 lbs.
What is differential settlement?
During and after the building construction, settlement of the foundation structure is considered normal and acceptable to a certain extent. However, a potential problem occurs with differential settlements. Differential settlements are uneven foundation settlements that can be the result of numerous causes.
What are the 3 types of foundations?
Slab Foundations. A slab is one of the most common types of foundations, requiring the least amount of lot prep to begin building. … Crawlspace Foundations. Homes with a crawlspace foundation are elevated a few feet off the ground. … Basement Foundations.
What is the process of piling?
Bored Piling Process Installing a bored pile starts with drilling a vertical hole into the soil, using a bored piling machine. … Once the hole is drilled, a structure of reinforcing steel rebar is built and lowered into the hole, then the hole is filled with concrete.