伍家岗长江大桥浅埋式锚碇基础承载力原位试验研究

In-situ Test Research on Shallow Buried Anchor Foundation of Wujiagang Yangtze River Bridge

伍家岗长江大桥江南测为浅埋式重力锚碇基础,该工程采用基底压浆加固方法解决浅埋式锚碇基础持力层分布不均匀、偏心受荷等因素引起的不均匀沉降和失稳问题。为了可靠地评估浅埋式锚碇基础的不均匀沉降和水平变位,结合相关规范要求,进行浅层平板载荷和直剪原位试验。试验得到了卵砾石持力层与素混凝土之间的摩阻系数以及注浆加固之后地基的承载力特征值。试验结果可为设计提供依据,也为我国今后的浅埋式锚碇基础设计提供工程参考。

Shallow buried anchor foundation was adopted at the south side of Wujiagang Yangtze River Bridge.In this project,grouting reinforcement was used at the base of foundation to solve the uneven settlement and instability,which caused by uneven distribution of the bearing stratum and eccentric loads.Shallow plate loading and direct shear in-situ tests were carried out combining the relevant specifications in order to reliably e-valuate the uneven settlement and horizontal displacement of shallow buried anchor foundation.The friction co-efficient between grave bearing stratum and concrete and the characteristic value of bearing capacity after grou-ting reinforcement were obtained through in-situ tests,And the results can provide a basis for design and engi-neering reference for the future shallow buried anchor foundation in China.