Pile Design and Construction Practice, Fifth edition

factor of 2. At a depth of 113 m the shaft friction is 30 MN. Therefore, the safety factor on uplift is 30/8, that is, nearly 4. ...

Average shearing strength along pile shaft (from Figure 4.43) . Take an adhesion factor of 0.45. Then from equation 4.7, total s ...

An adhesion factor of 0.3 should be used to allow for delays and softening effects while drilling the enlarged base. Thus total ...

It is assumed that the shear strength/depth realtionships in Figure 4.43 were based on an adequate number of boreholes and soil ...

average value of Nof 15 blows/300 mm. The pile is required to carry a compressive load of 250 kN and an uplift load of 180 kN. D ...

At 12 m, ultimate unit shaft friction resistance fs 0.012  1  103 12 kN/m^2 At 26 m, fs 0.012  5  103 60 kN/m^2 At 28 m, f ...

232 Resistance of piles to compressive loads qc 1 (7  15)  0.5 11 MN/m^2 , and over 8 diameters above the toe qc 2 (5  8) ...

From plots of individual cone readings, shown typically for CPT 1 in Figure 4.45 the average and characteristic cone resistances ...

The mean and minimum values of Rcalare Rcal(mean) (6.82  8.17  8.65  9.07)/4 8.18 MN Rcal(min) 6.82 for CPT1 The above values ...

Resistance of piles to compressive loads 235 Calculating the base resistance, qcat base 9.7 MN/m^2 Dinner/DCPT 0.438/0.036 12.2 ...

Total base resistance = Total pile resistance 19297  7952 27 249 kN Factor of safety = which is satisfactory If the rock sock ...

For a wall thickness of 19 mm in mild steel (fy= 240 MN/m^2 ) Allowed load = 0.5  240  0.0626 = 7.5 MN Therefore take a maximu ...

skin friction will not be developed below the point where the clay settles by less than 15 mm relative to site datum. After pile ...

If there is concern about long-term corrosion of the steel section in the hydraulic fill, the cube strength of the concrete fill ...

5.1 Group action in piled foundations The supporting capacity of a group of vertically loaded piles can, in many situations, be ...

Pile groups under compressive loading 241 average load per pile when failure of the complete group occurs, to the load at failur ...

242 Pile groups under compressive loading An important point to note in the application of soil mechanics methods to the design ...

Pile groups under compressive loading 243 The comparative group settlements were DEFPIG 42 mm PGROUP 31 mm Equivalent raft 30 mm ...

244 Pile groups under compressive loading its ultimate bearing capacity as determined for a given penetration by calculation, st ...

Pile groups under compressive loading 245 where c cohesion intercept of soil Nc, Nqand N bearing capacity factors sc, sqand s ...