小半径曲线并大坡度盾构施工管片破损及上浮受力分析

以天津地铁三号线水上北路站～吴家窑站盾构区间施工为背景,在管片处于小半径曲线、大坡度盾构施工的情况下,对管片的受力分析,讨论了引起管片破损及管片上浮的原因,并提出了相应的技术控制措施。研究结果印证了在地质为淤泥质粉质粘土层的条件下,管片破损的主要原因是推进油缸的靴撑对管片产生的侧向分力;管片上浮的决定性因素为壁后注浆的静态上浮力和千斤顶的推力,以及在设计轴线的法线上产生的向上的分力。

Segment Disrepair and Buoyanc Analysis of Shield Tunneling at Small Radius Curve with Steep Slope

This paper discusses the cause of segment puts forward the corresponding technical control measures The analysis takes the shield tunnel construction from Shui disrepair and floatation of shield tunnel segment, and with the shield tunnel segment at small radius curve. shangbeilu station to the Wujiayao station of line no. 3 of Tianjin city as the background. The results prove that the main cause of segment disrepair is the side-force produced by boots of oil cylinder＇s support under geological structure of muddy silty clay layer, and the decisive factor of floating segments is the static upward buoyancy of the grouting and jack thrust, and the side-force in the normal line of the design axis.