小转弯曲线隧道TBM选型与掘进姿态调控方法

Tunnel Boring Machine Selection and Tunneling Attitude Control Method for Tunnels With Small Turning Curves

小转弯隧道施工时全断面隧道掘进机(full-section tunnel boring machine,TBM)的选型设计和掘进姿态控制具有特殊性,目前还缺乏通用的理论依据和指导方法。针对此问题,首先,对传统类型TBM小转弯选型进行研究,结合已有项目数据和几何模拟,确定传统类型TBM能适应的最小转弯半径。然后,对双盾敞开式TBM的推进系统和导向系统进行针对性设计,通过分析双盾敞开式TBM推进系统结构和实际施工,提出转弯时双盾敞开式TBM推进油缸内外侧行程差值的理论计算方法和施工过程中的姿态调控方法。最后,得出如下结论:1)当隧道转弯半径小于200 m时,敞开式TBM适应难度较大,需要采用双盾敞开式TBM;2)结合抚宁抽水蓄能电站项目实际施工情况,提出的双盾敞开式TBM的理论计算方法和姿态调控方法确保了转弯段隧道的轴线偏差在要求范围内。

The selection and design of a full-section tunnel boring machine(TBM)and the driving attitude control are critical factors for tunnels with small turning curves.Presently,no universal theoretical basis or guidance methods are available.Therefore,the minimum turning radius applicable for the traditional TBM is determined based on the existing projects and geometrical models.Thereafter,targeted designs of the propulsion and guidance systems of a double-shield open TBM are prepared,and the structure and construction conditions of the propulsion system are analyzed.Finally,the theoretical method to calculate the inner and outer stroke differences of the double-shield open TBM propulsion cylinder during turning and the attitude control method during construction are proposed.The following conclusions are drawn:(1)When the turning radius of the tunnel is less than 200 m,a double-shield open TBM has better applicability than an open-shield TBM.(2)The application of the TBM in the Funing pumped storage power station project demonstrates that the proposed theoretical calculation method and attitude control method of the double-shield open TBM can control the axis deviation of the tunnel in the turning section within the required range.