Axial Performance of Continuous-Flight-Auger Piles for Bearing

摘要

Technology for the construction of continuous-flight-auger (CFA) piles has211u001eadvanced to the point where these types of piles potentially can be considered as 211u001ereliable as other types of piling (driven piles, drilled shafts) for supporting 211u001ebearing loads produced by highway structures. To provides a basis for the axial 211u001edesign and construction of CFA soils in the coastal soils of the Houston District 211u001eof the Texas Department of Transportation, a thorough comparison was made of 211u001eseveral axial capacity prediction methods and capacities of CFA piles measured in 211u001enumerous load tests performed for the private sector. A special effort was made 211u001eto construct (and carefully monitor the construction of) three instrumented test 211u001epiles at three geologically diverse sites in the Houston District: (1) a stiff 211u001eclay site, (2) am site with a profile consisting of stiff clay and loose, 211u001ewaterbearing sand, and (3) a site consisting of dry, medium dense sand. Analysis 211u001eof the axial load test results confirmed the preliminary findings given above and 211u001ealso confirmed that with appropriate construction controls CFA piles can be 211u001einstalled with high axial capacity and a high degree of structural integrity.