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  Harmful Gas Eruption Prediction and Its Protection Based on Solid-Fluid-Gas Coupling in Shield Tunneling

  In some cities in southern China, the shield machine will be encountered the geological environment of explosive harmful gas in the process of metro tunneling, combined with the shield machine does not have explosion-proof function, that is likely to cause harmful gases gush out in a moment and induce harmful gas exceed standard even explode. Therefore, solid-fluid-gas coupling theoretical assumptions is set up, and achieved through the Fish function in Flace3D that has not the simulation capacity. Then the process of harmful gas eruption in the shield tunneling is forecasted. On this basis, a set of real-time monitoring system for the harmful gas is built up, which realizes automatic power off for shield machine and staff evacuation warning. The research achievement has been successfully applied in practical project.

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