Shaking Table Test of Microbial Damping Layer of Tunnel Crossing Fault in Underground Soil Structures

In this paper, relying on the East Africa Great Rift Valley Railway Tunnel Construction Project, based on the MICP (Microbial Induced Calcite Precipitation) technology, the microbial cemented tunnel shock-absorbing layer is made by using geogrid and rubber particles. Through the design of two sets of shaking table tests, the comparative analysis has The response characteristics of the cross-fault tunnel without microbial damping layer to seismic waves are simulated to study the anti-seismic effect of the microbial damping layer. The results show that the microbial damping layer can effectively reduce the peak acceleration intensity of the surrounding rock at the fault, with a reduction of 21.28% under the E1 wave and 54.92% under the Kobe wave. Both the peak acceleration and the strain of the tunnel lining decreased. At the same time, the microbial damping layer can reduce the acceleration difference between the left and right lining of the tunnel at the fault. The difference is reduced to 12.92% under the E1 wave; the difference under the Kobe wave is reduced to 8.82%, making the lining close to stability under vibration. The research results can provide a reference for the shock absorption of the Great Rift Valley Tunnel Project in East Africa and the application of microbial materials.

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