摘要
兰渝铁路新城子隧道受高地应力软岩影响,为典型的挤压性大变形隧道。本文以新城子隧道为工程背景,为确保安全快速的贯通大跨段,展开了对挤压性围岩大跨隧道的挑顶技术研究。通过对新城子隧道工程特点、地质特点和变形特点的综合分析,研究确定了双支洞挑顶技术,即:上支洞爬坡挑顶进入正洞上台阶,下支洞平坡进入正洞下台阶。最后从监测数据分析和经济分析上验证了方案的可行性,确保了新城子隧道的顺利贯通。
Affected by the high crustal stress and soft rock,the new sub railway tunnel between Lanzhou and Chongqing is a typical large deformation tunnel. This paper was based on the new sub railway and carried out researches on the roof ripping technology of the long-span tunnel double branch hole of extruded surrounding rock in order to ensure the safety and quickness of perforating long span. Based on the comprehensive analysis of engineering,geological and deformation characteristics of the new sub railway,the research determined the roof ripping technology of double branch hole,which was that the climbing roof ripping of upper branch hole got into the upper step,and the climbing roof ripping of down branch hole got into the down step. At last,through the analysis of monitoring data and economy,the feasibility of the plan was verified and the transfixion of the new sub railway was ensured.
引文
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