Research on Water Pressure Characteristics and Stability Control of Tunnel Lining in Strongly Water-Rich Fissure Rock Body
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 0.129 5 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.
strong water-rich fissurelining water pressuremodel testpressure on surrounding rockcontrol measures
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