单线铁路隧道高地应力软岩破碎带大变形控制措施研究

为解决高地应力隧道软岩破碎带大变形的控制问题,以兰渝铁路某隧道为例,分析了软岩破碎带的变形特征,结合前期变形控制的经验,确定软岩破碎带的变形等级,采取保护围岩的施工理念,选择合理的支护参数,加强锁脚锚杆,施作锁固锚杆,使支护结构均匀受力,预留合理变形量并确定工序化注浆和横撑支护加强的时机,短台阶开挖、快速封闭和适时施作衬砌,建立大变形控制流程,有效控制了隧道软岩破碎带大变形.

Study of Large-Deformation-Controlling Measures for Single-Track Railway Tunnels in High-Stress Broken Areas of Soft Rock

Since GFRP materials have the advantages of being light in weight, high in strength and good in corrosion resistance, they may find wide applications in engineering, but the use of GFRP profiles as bridge girders is rare. Through the adoption of the simplified equivalent circle model of the vehicle load, and by means of the finite element software and Tsai-Wu criterion, a static analysis of the GFRP profile as a bridge girder is carried out in the paper. The results of both the static analysis and the static load test show that,though the elastic modulus of the GFPR and the stiffness of the girder are small,the mid-span deflection value is relatively large, the material is very good in elastic resilience, and therefore, the double web GFRP profile can meet the requirement of using it as a girder for a portable bridge.