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Study on the Water Inrush Mechanism in Tunnelling with Karst Conduits Based on Nonlinear Seepage Model
(1. CCCC Third Navigation Engineering Bureau Co., Ltd., Shanghai 200032; 2. State Key Laboratory of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University, Chongqing 400074; 3. Guangxi Xinfazhan Communication Group Co., Ltd., Nanning 530029)
Abstract Water inrush in tunnels with karst conduits is a complex nonlinear seepage problem with multi-field cou? pling and may cause sudden disasters. In order to reveal the occurrence mechanism of water inrush in tunnels with karst conduits, this paper conducts a multi-field coupling analysis under the conditions of different water pressures in karst caves, different filling media in karst conduits and different karst conduit widths and lengths on the basis of the coupling mechanism of multiple physical fields, and draws the following conclusions: (1) water inrush disasters under the failure mode of karst conduits in tunnels are different depending on the difference in the permeabilities of the filling media; (2) the speed of the fluid flowing out of water-rich karst caves is low, but increases gradually after it flows through the karst conduits, and peaks when it enters the tunnel; (3) main factors affecting the water inrush process include: water pressure in water-rich karst cave, type of filling medium in karst conduit or fault fracture zone, width of karst conduit, and distance between tunnel and water source, of which the width of karst conduit and type of filling medium in karst conduit have a greater influence on water inrush than the other factors.
Abstract：
Water inrush in tunnels with karst conduits is a complex nonlinear seepage problem with multi-field cou? pling and may cause sudden disasters. In order to reveal the occurrence mechanism of water inrush in tunnels with karst conduits, this paper conducts a multi-field coupling analysis under the conditions of different water pressures in karst caves, different filling media in karst conduits and different karst conduit widths and lengths on the basis of the coupling mechanism of multiple physical fields, and draws the following conclusions: (1) water inrush disasters under the failure mode of karst conduits in tunnels are different depending on the difference in the permeabilities of the filling media; (2) the speed of the fluid flowing out of water-rich karst caves is low, but increases gradually after it flows through the karst conduits, and peaks when it enters the tunnel; (3) main factors affecting the water inrush process include: water pressure in water-rich karst cave, type of filling medium in karst conduit or fault fracture zone, width of karst conduit, and distance between tunnel and water source, of which the width of karst conduit and type of filling medium in karst conduit have a greater influence on water inrush than the other factors.
CHEN Zhongda1 LIN Zhi2 CHEN Xiang2 YANG Hongyun2 LU Yuanen3 ZHAO Yixin2
.Study on the Water Inrush Mechanism in Tunnelling with Karst Conduits Based on Nonlinear Seepage Model[J] MODERN TUNNELLING TECHNOLOGY, 2022,V59(1): 149-155
2022, Vol. 59 