Abstract

An experiment is carried out to simulate siltstone tunnel water inrush with both the water pressure and no water pressure by biaxial rigid servo-controlled system. The PCI-2 acoustic emission(AE) system produced by American physical acoustics corporation is used to collect data of the AE in the process of water inrush synchronously. Study on the influence of water pressure on water inrush process and the entropy of AE combined with the water inrush process. The result shows that the water pressure change face seepage model, and advanced the penetration time and water inrush time of tunnel face; The water pressure changed the entropy evolution model and fluctuation interval before water inrush occurred, the entropy increase slowly, the whole loading process in the range of 1~1.8 before the water inrush occurred under the conditions of without water pressure; In the conditions of water pressure the entropy jump increase, the whole loading process in the range of 1.0~3.0 before the water inrush occurred. The results provide an experimental basis for the application of AE to the monitoring and early warning of tunnel water inrush.

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