Abstract
In order to study the bearing characteristics of pile foundation in the deep loess layer of Longdong area, field tests were carried out on the basis of a project in Huachi County, Qingyang City. Three test cast-in-place piles of the basement were selected for static load tests. The Q-S curve of the three test piles was gentle, without obvious steep drop. The S-lgt curve was arranged in a gentle and regular way, with high bearing capacity, uniform and small settlement. So it can be used as the foundation of buildings bearing large loads. In the test, the load is mainly borne by the reaction force provided by the side friction of the pile; the axial force distribution of the pile body with depth is not only related to the load on the top of the pile, but also to the nature of the soil around the pile.
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