强富水裂隙岩体隧道衬砌水压力特征及稳定性研究  

Research on Water Pressure Characteristics and Stability Control of Tunnel Lining in Strongly Water-Rich Fissure Rock Body

作　　者：惠云杰[1] HUI Yunjie(China Railway 18th Bureau Group Fifth Engineering Co.Ltd.,Tianjin 300459,China)

机构地区：[1]中铁十八局集团第五工程有限公司,天津300459

出　　处：《铁道建筑技术》2024年第5期134-138,共5页Railway Construction Technology

基　　金：中国铁建股份有限公司科技研发计划项目(2022-C20)。

摘　　要：为控制隧道穿越强富水裂隙岩体围岩稳定性,以天河山隧道为例,采用三维相似模拟试验研究了衬砌水压力特征,得出相较于传统的无环向盲管而言,有环向盲管的配置使得衬砌背后水压力轻微减小;在衬砌结构的关键交接点上的衬砌背后水压力的数值相对于非交叉位置衬砌背后水压力值较小;围岩底部排水系统和衬砌环向与纵向盲管排水系统之间相互配合,此种设置能够降低高水压富水裂隙岩体隧道衬砌背后的水压力。同时提出了“反压土石回填+型钢支撑+小导管注浆+超前管棚注浆”控制措施。现场监测结果表明:隧道钢拱架最大受力位置为拱顶,受拉值为45.3 MPa,最大围岩压力出现在左侧拱墙,为0.1295 MPa,且二者在仰拱施作完成后围岩压力趋于稳定,说明整体结构处于安全状态。In order to control the stability of the surrounding rock of the tunnel through the strong water-rich fissure rock body,this paper took the Tianhe Mountain Tunnel as an example,and adopted three-dimensional similarity simulation test to study the characteristics of the lining water pressure,and concluded that the configuration of the lining with annular blind pipe made the water pressure behind the lining slightly reduced compared with the traditional non-annular blind pipe;the value of the water pressure behind the lining in the key intersection of lining structure was smaller compared with the value of the water pressure behind the lining in non-intersection location;the drainage system at the bottom of the surrounding rock and the coordination between lining annular and longitudinal blind pipe drainage system can reduce the high water pressure water-rich fissure rock body tunnel lining.At the same time,the control measures of“backfilling with backpressure soil and rock+steel support+small conduit grouting+over the pipe shed grouting”were proposed.On-site monitoring results show that:the maximum stress position of the tunnel steel arch is the top of the arch,with a tensile value of 45.3 MPa,and the maximum pressure on surrounding rock occurs in the left arch wall,with a value of 0.1295 MPa,and both of them tend to stabilize after the completion of the superelevation arch,which indicates that the overall structure is in a safe condition.

关 键 词：强富水裂隙 衬砌水压力 模型试验 围岩压力 控制措施 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]