This paper provides an investigation of shaft and base grouted concretepile behavior by conducting vertical compressive and uplift static loadtests (SLTs) in Jinan, China. Three concrete piles were tested bycompressive SLTs. Two of these piles were applied with shaft and basegrouting, and base grouting technology respectively, and the third wasapplied without any grouting. Two uplift SLTs were carried out on oneshaft and base grouted pile, and one pile without grouting. Traditionalmethods which include Load-settlement curvatures (L-s), Settlementlogtime curvatures (s-lgt) and Time-log Load curvatures (t-lgQ)analysis were provided to check if the bored piles reached the designrequirement. In addition, an interpretation of the test results fromDouble-tangent, DeBeer’s, and Chin’s methods (for compressive SLTs)and Mazurkiewicz’s method (for uplift SLTs) were provided fordetermining the ultimate pile capacity where piles experienced nonplungingfailure. Results from the five SLTs program indicates that theDouble-tangent and DeBeer's test results are close to each otherwhereas Chin's method overestimates the pile capacity; the base andshaft grouting pile and base grouting pile (compressive load) increases9.82% and 2.89% of its capacity, respectively. Compared to theultimate uplift SLTs, there is a 15.7% increment of pile capacity afterusing base and shaft grouting technology.
展开▼
