Instrumented drilled shaft

Liew et al. (2004) describe the results of an instrumented drilled shaft at a site located at Bukit Jalil, Kuala Lumpur, Malaysia. The site is underlain by weathered meta-sedimentary soils of the Kenny Hill formation, which consists mainly of sandy clay and silty sand (Figure 6.9). 

Figure 6.10. Details of the instrumented drilled shaft (from Liew et al. 2004).

Touma, F. T. and L. C. Reese. 1972. Load Tests of Instrumented Drilled Shafts Constructed by the Slurry Displacement Method. Research report conducted under Interagency contract 108 for the Texas Elighway Department, Center for Highway Research, The University of Texas at Austin, January, 79 pp. 

Figure 6.2 shows the back-calculated values of a for drilled shafts obtained from instrumented load tests. Skin friction resistance in the upper 1.5 m of the shaft, and at the base of the shaft (at height equal to the diameter of the shaft from the base), is usually ignored. 

Cole-Parmer Instrument Co. Chicago, IL. Alternatively, a variable-speed shop drill may be used with a standard stirrer shaft. 

T) ical applications include pump shafts, impellers, electronic components, doctor blades, and scrapers, oil well drill collars and instruments, springs and valve trim. 

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