Numerical Analysis of Influence of Water Pressure of Overlying  Karst Cave on Tunnel Water Inrush

doi:10.3973/j.issn.1672-741X.2017.02.007

Tunnel Construction ›› 2017, Vol. 37 ›› Issue (2): 167-173.DOI: 10.3973/j.issn.1672-741X.2017.02.007

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Numerical Analysis of Influence of Water Pressure of Overlying  Karst Cave on Tunnel Water Inrush

LEI Ting^{1, 2}, GUAN Xin¹, HONG Fan¹, JU Yanfei^{1, 2}, HAN Jinlong^{1, 2}, LI Lele^{1, 2}

(1. Wuhan Harbour Engineering Quality Detection Co., Ltd., Wuhan 430040, Hubei, China;  2. China Hubei Key Laboratory of Advanced Materials & Reinforcement Technology Research for  Marine Environment Structures, Wuhan 430040, Hubei, China)

Received:2016-08-19 Revised:2016-11-10 Online:2017-02-20 Published:2017-03-04

Abstract

Abstract:

Due to the complex geological conditions of karst area, tunnel construction is often accompanied by potential safety hazard of water inrush from karst caves, especially when the karst cave overlies tunnel (in which condition the water pressure is very important). A numerical model for tunnel under a karst cave is established, and the water pressure of the karst cave is regarded as a construction condition. The variation rules of pore water pressure of surrounding rocks are analyzed, and the distribution of water inrush channel during tunnel excavation is revealed. The water inrush channel and safety thickness of rock under different water pressures of karst cave are decided based on the maximum value estimation method of mutation of the element pore water pressure. The study results show that the distance between water inrush channel and the bottom of karst cave and the safety thickness of rock increase with the water pressure of overlying karst cave increases.

Key words: karst tunnel, overlying cave, water pressure of karst cave, water inrush channel, safety thickness

CLC Number:

U 45

LEI Ting, GUAN Xin, HONG Fan, JU Yanfei, HAN Jinlong, LI Lele. Numerical Analysis of Influence of Water Pressure of Overlying  Karst Cave on Tunnel Water Inrush[J]. Tunnel Construction, 2017, 37(2): 167-173.

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Numerical Analysis of Influence of Water Pressure of Overlying  Karst Cave on Tunnel Water Inrush

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