沉井基础侧摩阻力的计算与分析

Calculation and Analysis of the Side Friction of Caisson Foundation

根据泰州大桥南锚沉井基础下沉过程中侧壁土压力的实时监测资料,结合沉井下沉施工工艺和施工方案等,推导计算出了沉井侧壁摩阻力分布规律;分析了沉井在下沉过程中的受力情况,在此基础上建立了大型沉井下沉过程中的侧壁摩阻力计算模型,与其他学者建立的计算模型进行了对比和分析,得出本模型的特点:沉井侧壁摩阻力在2/3H处线性增大f0,之后在一定的深度范围内保持恒定,在H-H2深度范围内略有减小。

According to the real-time monitoring data of the side wall soil pressure during the subsidence of the foundation of the southern anchor sink well of Taizhou Bridge,Combined with the sinking construction process and construction plan,etc.To derive the calculated the countersunk hole in the side wall of the Resistance distribution patterns;Analyzing the stress distribution in the sinking process of open caisson.On this basis,a model of sidewall resistance calculation in the process of large-scale sinkhole sinking is established.Compared with and analyzing the computational models established by other scholars,The characteristics of this model are obtained:the side friction of caisson foundation increases linearly to f0 at 2/3H,And then it stays constant for a certain amount of depth.It decreases slightly in the H-H2depth range.