胡麻岭隧道斜井富水粉细砂地层松动圈测试与围岩压力计算

摘要

兰渝铁路胡麻岭隧道富水粉细砂地层施工难度大,安全风险高,为了解该套地层在开挖施工后松动圈的大小,利用斜井进行了地震折射层析法测试.根据测试结果,通过定量对隧道围岩压力进行计算,来调整优化支护设计参数,为施工提供可靠保证.%The construction of the Humaling tunnel on the Lanzhou-Chongqing railway in fine silt stratum with large quantities of water was difficult and risky. To understand the scope of the loose rock zone after excavation, the seismic reflection chromatography was taken by means of an inclined shaft. Based on the measured results,calculations were carried out concerning the pressure of the surrounding rock, and support parameters were optimized.