不同竖向荷载作用下桩基水平载荷试验研究

石油化工装置具有高、大、重及对地基承载力和沉降变形要求严格等特点，宁波镇海某石油化工项目位于沿海软土地基，工程地质条件差，风荷载大，对桩基的水平承载力要求较高。为了取得符合工程实际情况的桩基水平承载力参数，在工作区内开展了不同桩径、桩长、桩顶竖向荷载作用下的预制方桩桩基的水平静载荷试验。试验结果表明，在桩顶自由条件下，单桩水平承载力随着桩径和桩长的增加而增大，但并非是线性增长，而是呈幂函数增长关系；单桩水平承载力随着桩顶竖向荷载的增加同样呈幂函数增长关系；群桩水平承载力大于单桩水平承载力之和。

Test Research on Horizontal Load of Pile Foundation under Different Vertical Loads

Petrochemical device is high, large and heavy, for which, the bearing capacity of foundation and the settlement deformation should be strictly controlled. The paper presents a petrochemical project in soft soil of Ningbo, because of the poor engineering geological conditions and large wind load, the horizontal bearing capacity is a very important factor. In order to achieve the horizontal bearing capacity parameters of pile foundation in accordance with the practical conditions, the horizontal static load test on the foundation of prefabricated square-pile is carried out under the conditions of different pile diameters, pile lengths and vertical loads on pile top in working area. The test results show that when the pile top is under the free condition, the horizontal bearing capacity of single pile increases along with the increase of diameter and the length of the pile, not being linear growth, but the power function relation. The horizontal bearing capacity of single pile increases along with the increase of vertical load on pile top, and also with power function relation. The horizontal bearing capacity of pile group is larger than the sum of that of single piles.