湿陷性黄土地区桥梁桩基承载力试验分析

Test analysis on bearing capacity of bridge pile foundation in collapsible loess area

为研究湿陷性黄土地区桩基承载力,在浸水和不浸水两种情况下开展桩基承载力试验,确定桩基极限承载力。结合施工现场地质情况,制作试桩开展静载试验。分析试验结果,不浸水试桩极限承载力为4200 kN,浸水试桩极限承载力为2520 kN,说明浸水后桩基承载力明显下降,在桩基础设计时应重点考虑黄土湿陷性的影响。

In order to study the bearing capacity of pile foundation in collapsible loess area,the pile foundation bearing capacity test was carried out under water immersion and non-water immersion to determine the ultimate bearing capacity of pile foundation.Combined with the geological conditions of the construction site,test piles were made to carry out static load tests.Analyzing the test results,it is concluded that the ultimate bearing capacity of the non-immersion test pile is 4200 kN,and the ultimate bearing capacity of the immersion test pile is 2520 kN,which indicates that the bearing capacity of the pile foundation decreases significantly after immersion.The influence of the collapsibility of loess should be considered in the design of the pile foundation.