: 为更加准确地确定黄土隧道开挖过程中不同黄土类型的变形控制基准,以宝兰客运专线安定隧道等6座隧道中的47个拱顶 沉降实测数据作为研究的样本,根据土层的形成年代及成分,将其分为Q2 黏质黄土、Q2 砂性黄土、Q3 砂性黄土及Q4 砂性黄土4 类,通过研究得到其全位移的回归曲线。 数据表明: 1)在一定范围内的含水率对最终沉降值影响并不明显,而基底承载力、埋深这 2个因素和最终沉降量关系极为密切; 2)对4类黄土的最终沉降的预测值进行分类分析,得到黄土隧道初步的变形控制基准Q2 黏 质黄土为110 mm、Q2 砂性黄土为170 mm、Q3 砂性黄土为300 mm、Q4 砂性黄土为300 mm的结论,再根据埋深和地基承载力进行修 正,形成的控制基准在目前在建的银西铁路隧道中得到了较好的验证。

The monitoring data of 47 crown deformation points in 6 tunnels on Baoji-Lanzhou Passenger-dedicated Line are used as research samples; and the samples are divided into 4 types, i.e. Q2 clayey loess, Q2 sandy loess, Q3 sandy loess and Q4 sandy loess, according to the formation age and composition. The displacement regression curves are obtained. The data show that: (1) The influence of water content in a certain range on the final subsidence value is little, while those of the bearing capacity of foundation and the buried depth are great. (2) By analyzing the predicted final settlement of the 4 types of loess, the deformation control standards are 110 mm for Q2 clayey loess, 170 mm for Q2 sandy loess, and 300 mm for Q3 and Q4 sandy loess, which is modified according to buried depth and bearing capacity of foundation; and the final standards are verified in Yinchuan-Xi′an Railway tunnels.