滑坡区隧道自锚式新型加固结构理论研究

 针对位于深厚滑坡体中隧道的加固问题，提出了利用锚索、抗滑桩只对与隧道稳定直接相关的洞周滑坡体进行抗滑及锚固处治，同时加固隧道衬砌结构，使隧道衬砌结构、抗滑桩与锚索形成一种新型的滑坡隧道自锚式加固结构体系。该加固结构将滑床作为桩和锚索稳定的支撑点，属于超静定结构。针对该加固结构体系的特点建立其物理力学模型，并采用矩阵传递法进行理论推导，得到加固结构体系的内力与位移。通过算例分析结果表明，锚索的作用使隧道边墙不利受力状态有所改善，抗滑桩对隧道底铺和衬砌的变形有所约束，可以通过锚索和抗滑桩结构，使隧道衬砌结构的受力和变形得到优化控制。

THEORY RESEARCH OF THE SELF-ANCHORED NEW TYPE REINFORCEMENT STRUCTURE FOR THE LANDSLIDE TUNNEL

According to the reinforcement issue of tunnels which are located in the deep landslide，a kind of self-anchored landside tunnel strengthening structure system is put forward. To the system，only the landslide，which is directly related to the tunnel stability，around the tunnel is taken anti-slide and reinforcement treatment with anti-slide pile and anchor cable，at the same time，strengthening tunnel lining structure. The tunnel lining structure，anti-slide pile and anchor cable form the self-anchored landslide tunnel strengthening structure system. The strengthening structure，which belongs to the statically indeterminate structure，will make slide bed as the stable support point of pile and anchor cable. According to the characteristics of the strengthening structure system，the physical and mechanical model is established，and the matrix transfer method is used to the theoretical derivation，internal forces and displacements of the reinforcement system are obtained.Example analysis results show that as a result of the action of anchor cable，the adverse stress of tunnel wall has been improved，and the anti-slide pile can constraint the deformation of tunnel invert and lining. Accordingly，the stress and deformation of the tunnel lining structure can be optimized and controlled by the anchor cable and anti-slide pile structure.