在分析黄土隧道初期支护必要性的基础上,现场实测了现有施工技术条件下,初期支护拱部系统锚杆的实际受力状况,并对拱部无系统锚杆下的初期支护喷射混凝土受力特性进行了分析,提出了大断面黄土隧道初期支护合理设置形式;通过定性分析钢拱架受力影响因素,给出了改善钢拱架承载性能的工程措施。 Based on the analysis of the necessity of the initial support of the loess tunnel, the actual stress conditions of the anchors of the initial arch support system were measured on the spot under the current construction technology conditions. The initial support The mechanical properties of sprayed concrete are analyzed, and the reasonable setting forms of initial support for large section loess tunnel are put forward. The engineering measures to improve the bearing capacity of steel arch frame are given through qualitative analysis of the factors that affect the load of steel arch frame.