基于缝合地带软岩隧道大变形机理研究

本文针对中老铁路会富莱软岩隧道在施工过程中出现的大变形问题,结合大变形破坏特征,在变形区段对围岩的物理力学性质、区域地应力、围岩松动圈等主要内容开展了试验研究,分析判定了软岩特性及等级,并通过调整支护参数,改善衬砌结构的受力状态,改进施工工艺、方法等工程措施,确保了后续施工的顺利进行。

Study on Large Deformation Mechanism of Soft Rock Tunnel in Suture Zone

For the large deformation during the construction of Huifulai soft rock tunnel of China-Laos Railway,in combination with the failure characteristics of large deformation,this paper studies the physical and mechanical properties of surrounding rocks,regional geostress and surrounding rock loose circles in the deformation sections,and analyzes and determines the characteristics and grades of soft rocks.The smooth progress of the subsequent construction is ensured by adjusting the support parameters,and improving the stress state of the lining structure and the technologies and methods of the construction.