富水土质隧洞危险洞段处理措施及变形分析

基于库尉输水隧洞的现场监测资料并结合其施工情况,分析了涌水洞段变形突增、掌子面塌方及地下水浸泡时相应洞段的加固措施和变形特征,提出对富水土质隧洞特别是渗水量较大的洞段应加强现场监控量测,对潜在或已存在的危险洞段及时妥善进行加固处理,并结合现场变形监测数据检验加固措施是否有效,保证隧洞围岩的稳定和施工安全。

Deformation analysis and treatment measures on dangerous section of earth tunnel through water-rich strata

Based on the in situ monitoring data of Kuyu Diversion Tunnel and combined with construction of it，the sudden increase of deformation，collapse of the excavating face of the water-gushing section of the tunnel and the strengthening measures and deformation properties of the corresponding tunnel section when dipped in groundwater are analyzed herein，and then it is suggested that the in situ monitoring must be strengthened for the construction of the earth tunnel through water-rich strata，especially for those sections with large seepage，while adaptable reinforcements are to be timely made on the tunnel sections with potential hazard or under the existing danger and the availabilities of the reinforcing measures are to be verified according to the data of the in situ monitoring on the deformation，so as to ensure the stability of the surrounding rock and the construction safety.