斜向注浆管棚在侧压力隧道施工中的应用

洞冲里隧道进口处于Ⅴ级围岩地段,该地段地质裂隙发育、地下水丰富,隧道设计在山体的一侧;由于设计未曾考虑偏压的影响,在隧道施工过程中出现隧道边、仰坡面开裂、滑动现象,洞内已经浇注完毕的二衬混凝土出现了开裂、错台;现场监控量测的数据出现拐点,通过研究分析确定为侧压力所致。根据现场的情况经过多个方案的分析、评价、对比后采用了地表斜向注浆长管棚施工方法解决了侧压力问题,取得了很好的效果。

Application of Slant Grouting Pipe Roof in Lateral Pressure Tunnel Construction

The entrance of Dongchongli tunnel is located at Ⅴ class surrounding segment with the geological fracture development and abundant groundwater,and the tunnel was designed to construct on one side of the mountain body.As the side pressure was not be considered in the design,the fracture and sliding occurred at the side of the tunnel and the front slope during the tunnel construction;cracking and dislocation happened in the second grouted lined concrete in the borehole and the turning point appeared in situ monitoring data.By the study and analysis,it was determined that all these were caused by side pressure.According to the field situation,the analysis and evaluation were made on several schemes;by the comparison,slant grouting long pipe roof was adopted to solve the side pressure with satisfied effect.