Pile Design and Construction Practice, Fifth edition

piles showed that the distribution of interface shear stress could be represented by the relationship f= 0.009(h/d)–0.5qfin com ...

Resistance of piles to compressive loads 187 Method Mean Qc/Qm Standard deviation(s) Coefficient of variation ICP, all piles 0.9 ...

the same type of soil and similar structures with particular reference to local information (Clauses 7.6.2.3 and 1.5.2.2). The o ...

4.5 Piles in layered fine- and coarse-grained soils It will be appreciated from Sections 4.2 and 4.3 that piles in fine-grained ...

gravel layer, the variation in thickness of the layer should be determined and its continuity across the site should be reliably ...

where qo ultimate base resistance in the lower weak layer ql ultimate base resistance in the upper stiff or dense stratum H dist ...

(2) The pile was then required to be driven a further 75 mm without any reduction in the driving resistance (3) If the resistanc ...

reached the point of ultimate resistance at a failure load of 4.2 MN. A safety factor of 2 on this condition gives a working loa ...

settlement that may be expected. If there is no such experience available, then it may be necessary to undertake loading tests o ...

(4) Obtain the safe end-bearing load on the pile from where Fis a safety factor greater than 3 (5) Obtain qfrom q= Wb/ B^2 and h ...

where Wsand Wb loads on the pile shaft and base respectively L shaft length Asand Ab cross-sectional area of the shaft and base ...

Piles driven in this manner are regarded as wholly end bearing: friction on the shaft is not considered to contribute to the sup ...

the rock mass below the pile toe but the amount of movement will not necessarily be large since the zone of rock influenced by a ...

where the bearing capacity factor: The variations in caused by joints in the rock mass are demonstrated by the comparisons in Ta ...

where c undrained shearing resistance B base width D base depth below the rock surface  effective density of the rock mass Nc, ...

and RQD of the rock as shown in Table 4.14 can be used. The qucvalues are determined from tests on core specimens of the intact ...

Granite rocks are widely distributed in the territories of Hong Kong, where the fresh rock is blanketed by varying thicknesses o ...

300 Piles driven into very weak to weak coral detrital limestone (N-value increasing from 20 blows to 60 blows per 300 mm over d ...

should be allowed between driving and load testing. The authors recommend a minimum period of 28 days. Some other observed value ...

Resistance of piles to compressive loads 205 Percentage of applied load Q carried in side-wall shear 0 20 Q Q Q B Q L = B L = 2B ...