研究目的:针对郑西客专函谷关大断面砂质黄土隧道，隧道开挖过程中初期支护受力及变形特点，进行 砂质黄土隧道支护合理性的研究，提出有效的支护措施。
研究结论:结合函谷关隧道设计施工及科研测试，通过现场支护变形、内力量测，分析总结浅、深埋条件下 大断面砂质黄土隧道围岩压力及支护受力特性后得知:对于大断面砂质黄土隧道，采用大刚度型钢钢架，结合 网喷微纤维混凝土等初期支护措施，是控制土体变形、保证施工安全的有效措施。
Research purposes: Based on the characteristics of primary bracing stress and its deformation during the excavation of tunnel, the researches are done on the bracing rationality for sand loess tunnel and the rational bracing measures are presented for the purpose of overcoming the problem in construction of large sectional sand loess Hanguguan Tunnel.
Research conclusions : The tests and analyses of the bracing deformation , inner force , bracing stress characteristics of deep-buried large sectional sand loess tunnel show adopting large section steel frame along with the primary bracing of fiber concrete is an effective way for control of soil deformation and ensuring the construction safety to the large sectional sand loess tunnel.
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