摘要
小导管高压注浆法是隧道工程不良地质施工采用的一种超前支护技术.本文以河北张石高速黑石岭隧道出口浅埋破碎段为例,对小导管高压注浆法在软弱破碎围岩开挖中的加固机理进行了研究,采用FLAC三维数值模拟方法对小导管施做过程中受力机理和注浆时围岩的塑性区、位移场进行了模拟,定量分析了小导管注浆法的加固效果.研究表明,采用小导管高压注浆法能显著抑制软弱破碎围岩的变形,减少隧道支护结构的变形和受力,避免浅埋软弱破碎围岩开挖中塌方现象的产生.
Ductule high pressure grouting technology is one of the advanced support patterns in tunnel engineering construction for unfavorable geological conditions. This paper has given an example of Heishiling tunnel construction at the shallow depth and crushed zone of the tunnel＇s exit, which be-longs to Zhangshi highway tunneling in Hebei province. First, efforts are made to explore the support mechanism of the ductule high pressure grouting technology in the excavation of soft-fracture wall rock. Then,by the Three-Dimensional Numerical Simulation of F LAC method, the plastic zone and the displacement field of the surrounding rock and stress mechanism are simulated, and a quantitative analysis of the support effect of the ductule high pressure grouting technology is presented. Finally, some conclusions are obtained as following： ductile grouting technology can considerably improve the stability of the surrounding rock, dramatically reduce the deformation and load of the support structure of the tunnel, and also avoid cave while excavating in fracture wall rock.
出处
《北京交通大学学报》
CAS
CSCD
北大核心
2008年第4期132-136,140,共6页
JOURNAL OF BEIJING JIAOTONG UNIVERSITY
基金
教育部重点资助项目(105016)
关键词
隧道
破碎围岩
小导管
高压注浆
加固机理
tunnels
fracture wall rock
ductule
high pressure grouting
support mechanism
