Nine Static vertical pile loading tests were carried out in Abu-Dhabi, the United Arab Emirates in order to assess the end bearing capacity and settlement of piles bored in slightly silty sands ...overlying soft rocky horizons like sandstone and calcarenite. The paper is aimed at presenting the results of interpretation of the pile tests in order to estimate the end bearing capacity in correlation with the unconfined compressive strength Rc and the rock quality designation (RQD). Load-settlement behaviour is also studied through an analysis by the elastic methods commonly used in pile design.
The aim of this paper is to investigate the pile end bearing capacity in highly breakable sands such as carbonate sand and decomposed granite soil, comparing with that in the hard grained silica ...sands, based on a series of triaxial compression and model pile tests, and further to discuss the estimating method of pile end bearing capacity in sands, considering the material compressibility. As a result, it was found that, even if much higher internal friction angle was obtained, the low pile end bearing capacity could be observed in the case of highly compressible sands. Further, a conventional manner to predict the end bearing capacity was presented empilically, combining the compressiblity to Prandtl's bearing factor for general shear failure.
To improve the performance of a bored steel H pile installed in a prebored hole, a grouted base is made around the base of the pile. The structural capacity of the pile with a grouted base was ...studied by two series of model loading tests. Failure mechanism was observed, which depended upon the geometry of the grouted base. The failure occurs in which the grouted base is thin, less than twice the pile diameter. Structural capacity increases with increasing the thickness of grouted base. Field tests were caried out, boring test, excavated measurement and loading tests. The effectiveness of the method and large ultimate bearing capacity were proved by the tests.
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