隧道穿越饱和软黄土合理注浆半径范围研究

Study on Reasonable Grouting Radius of Tunnel Crossing through Saturated Soft Loess

以西安地铁某号线穿越饱和软黄土地段为研究对象,针对施工中采用的全断面注浆加固地层措施,分析其合理的注浆半径。利用FLAC3D数值模拟软件,重点分析地铁隧道穿越饱和软黄土地层时不同注浆半径下的围岩竖向变形,并结合相关工程经验,确定合理的注浆半径。分析结果表明,针对本工程实际地质水文条件,合理的注浆半径为2~3 m。其可为类似地质条件下的工程提供借鉴。

Taking a subway tunnel in Xi＇an City as the re- search target, which crosses through the saturated soft lo- ess, the reasonable radius is analyzed by adopting the whole section grouting to reinforced the formation in the con- struction. FLAC3D numerical simulation software is ap- plied to study on the vertical strata deformation in different grouting radiuses when the tunnel crosses through the satu- rated soft loess. Combined with engineering experiences, the reasonable grouting radius is determined. The analyzed result shows that the reasonable grouting radius is about 2 3 m in view of the practical geological and hydrological conditions of the project. This reaserch can be taken as a reference for similar projects.