Testing Study On Vertical Bearing Properties Of Large-Diameter Cast-in-Place Pile Embedded In Rock

Currently the related research on the large-diameter cast-in-place pile embeddedin rock is relatively less. In many conditions, the static loading test of pile have toterminate because the load of test usually can not reach the limit load, and the test ofengineering pile can also not be pressed to the limit breaking state, so the limit load ofpile can not be judged, especially the frictional resistance and tip resistance. Thetheories of the related research and test methods still now continue to use relatedtheories of the pile-soil system of on the supposition that there is no glide occurredbetween pile and soil. According to the research, the author discovered that theabove-mentioned supposition is inapplicability to the study of cast-in-place pileembedded in rock, and make a model of loading transmission mechanism ofpile-soil(rock) system. This text think that the tiny glide occurred between pile androck, to the cast-in-place pile embedded in rock, can not be ignore. So the pile skinfrictional resistance value obtained from static loading test of pile is less than the testvalue. The study result is instructive for design, construct and deep study oflarge-diameter cast-in-place pile embedded in rock.