KVC Pile Geotechnical Parameters
KVC Pile – Consolidated Micropile Deep Foundation System invented by Adept Construction Solutions Inc. should be considered for numerous reasons:
- When the upper soil strata are too weak or compressible to support the required vertical loads;
- When shallow foundations cannot adequately support inclined, lateral, or uplift loads, and
overturning moments;
- When soils around foundations are subjected to liquefaction during seismic events (h);
- When there is limited access for large excavation and drilling machinery;
- When future excavations are planned which would require underpinning of shallow foundations;
- When expansive or collapsible soils are present, which could cause undesirable seasonal movements of the foundations;
- When conventional driven friction piles are not sufficient to support vertical or lateral loads;
- When large loads are anticipated (compressive, uplift or lateral) and where the amount of
allowable deformation is small;
- When seismically induced downdrag loads are large;
- Where the instability of slope cannot be maintained using conventional methods;
- When there is a limitation on water crossing work;
- When high cost of conventional deep foundation is a factor;
- When minimal disturbance is caused during construction.
Sample Evaluation Geotechnical Capacity of KVC Micropile
The allowable geotechnical bond capacity (PG-allowable)
PG allowable = (αbond/F.S.) x (π x DB x LB)
Where:
αbond = grout to ground ultimate bond strength;
F.S. = factor of safety applied to the ultimate bind strength;
DB = diameter of the bore hole;
LB = bond length
12- Inch Diameter
Zone 1:
LB = 20 psi
Length = 35 ft minimum
PG allowable for Zone 1 = (20psi/2) x π x 12 inches x 35 feet x 12 inches = 158 Kips
Zone 2:
αB = 35 psi
Length = 30 ft minimum
Total Minimum Drill Depth = 65 ft
PG allowable for Zone 2 = (35psi/2) x π x 12 inches x 30 feet x 12 inches = 237 Kips
Total allowable 12” KVC micropile (Zone 1+Zone 2) = 396 Kips
9- Inch Diameter
Zone 1:
αB = 20 psi
Length = 35 ft minimum
PG allowable for Zone 1 = (20psi/2) x π x DB x LB
= (20psi/2) x π x 9 inch x 35 feet x 9 inches = 119 Kips
Zone 2:
αB = 35 psi
Length = 30 ft minimum
PG allowable for Zone 2 = (35psi/2) x π x DB x LB
= (35psi/2) x π x 9 inch x 30 feet x 9 inches = 178 Kips
Total Minimum Drill Depth = 65 ft
Total allowable 9” KVC micropile (Zone 1+Zone 2) = 296 Kips
Lateral Load-Bearing Pier 24 Inch Diameter
PG allowable: Vertical Static
Minimum Drill Depth = 16 feet
2 feet x π x 400 psf x 15 feet = 37 Kips
PG allowable: Lateral Static
30 Kips
