中文摘要：

开展膏溶角砾岩隧道支护体系现场试验,研究无水段、高含水量段初期支护锚杆轴力、围岩压力、钢拱架应力及洞周位移、二次衬砌接触压力和钢筋应力。分析表明：高含水量比无水段初期支护受力增大约50%,而二次衬砌受力增长约30%;无水试验段拱腰锚杆主要受压,建议取消拱部系统锚杆,只打设拱部锁脚锚杆,及早封闭成环;高含水量段锚杆主要受拉,发挥拉拔力支护效果,建议锚杆参数不变;初期支护钢拱架架设能够立即承载,发挥支护作用明显。研究成果可为膏溶角砾岩地层隧道及类似工程的修建提供参考。

英文摘要：

In-situ experiments of support system were carried out to investigate bolt axial force,surrounding rock pressure,steel framework stress and tunnel deformation of primary support,contact pressure and steel stress for lining.The results show that under condition of high water content gypsum breccia,the stress of primary support increases by 50 %,and the stress of lining increases by 30 % with respect to drying one.Particularly combined with drying gypsum breccia,bolts at hance were subjected to compression.Accordingly,it suggests that systematic bolts at arch should be cancelled;and only feet-lock bolt should be installed.This could reduce sealing time of primary support significantly.Nevertheless,in terms of high water content gypsum breccia,most of bolts at hance were subjected to tension.Therefore,bolt parameters should be unchanged.Framework of primary support can bear load and is of paramount to support system once it is installed.The results are not only applicable to deep tunnel in gypsum breccia stratum,but also can be as reference for similar engineering.