为了解机械化施工大断面隧道围岩压力的变化规律和分布特征，依托郑万高速铁路湖北段大型机械化施工隧道群，开展大量围岩压力现场监测，根据测试结果对Ⅳ级和Ⅴ级深埋条件下围岩压力变化规律和分布特征进行分析，并与规范荷载进行对比。结果表明： 1）围岩压力监测数据从21~27 d开始稳定； 2）实测围岩压力小于《铁路隧道设计规范》深埋隧道计算荷载； 3）Ⅳ级深埋条件下，侧压力系数为规范荷载侧压力系数的1.2~2.4倍； 4）Ⅴ级深埋条件下，侧压力系数为规范侧压力系数的0.86~1.43倍。

A large amount of field measurement on surrounding rock stress of tunnel group on Hubei Section of ZhengzhouWanzhou Highspeed Railway with mechanized construction are carried out to learn the variation laws and distribution characteristics of surrounding rock stress of large crosssectional highspeed railway tunnel with mechanized construction. And then the surrounding rock stress variation laws and distribution characteristics of surrounding rock stress in Grade Ⅳ and Grade Ⅴ deepburied conditions are analyzed and compared with standard loads based on measurement results. The study results show that: (1)The stabilizing time of surrounding rock stress starts on the 21st to the 27th day. (2)The measured surrounding rock stress is less than the calculated load of deepburied tunnel in related railway design codes. (3)Under the condition of Grade Ⅳ depth, the lateral pressure coefficient is 1.2-2.4 times that of standard load. (4)Under the condition of Grade Ⅴ depth, the lateral pressure coefficient is 0.86-1.43 times that of standard load.