Study on the seepage characteristics of deep buried tunnels under variable high-pressure water heads
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ORIGINAL PAPER
Study on the seepage characteristics of deep buried tunnels under variable high-pressure water heads Yingchao Wang 1,2 & Zhaoyang Li 1,2 & Hongwen Jing 1,2 & Yabo Li 1,2 & Mitian Wang 1,2 Received: 13 February 2020 / Accepted: 26 September 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Well-connected seepage channels are the key components of tunnel water inrush. To study the trends of the pore water pressure in the rock mass in a seepage channel, the physical experiment and corresponding numerical model were established. First, in the seepage experiment under excavation disturbance, the propagation rate of the high-pressure water source and the growth rate of the pore water pressure in the rock mass were analyzed by considering the different water pressures. Second, under the same model size, parameters, and working conditions, the finite element method was used to simulate the seepage process of water in the rock mass. From the microlevel, the evolution process of the pore water pressure isosurface was obtained. The results showed that the pressure water head is positively correlated with the pore water pressure in the rock mass, which displays multiple approximate relationships. Moreover, when the water pressure is high, excavation disturbance can significantly increase the pore water pressure in the rock mass. The disturbance caused by the first excavation is larger than the subsequent excavations. In addition, the research results were compared with previous results. Reasonable agreements that would provide a reference for the conditions of high water-pressure disasters in deep buried tunnel construction were obtained. Keywords Water inrush . High-pressure water head . Excavation disturbance . Seepage characteristics
Introduction The construction of deep buried tunnels has been a longstanding challenge (Wang et al. 2019a, b). Under the combined action of high ground stress and high-pressure water, disasters such as rock burst and water inrush frequently occur, which have immeasurable consequences for safety, economic, and the ecological environment (Wu et al. 2019a). Highpressure water inrush disasters are characterized by strong explosiveness and large water inflow. Because surface water and groundwater are interconnected, water inrush has a relatively high impact on the lives of residents (Farhadian and Nikvar-Hassani 2019; Golian et al. 2018). Fortunately, many
* Yingchao Wang [email protected] 1
State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
2
School of Mechanics & Civil Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
scholars have carried out extensive research on effectively preventing the occurrence of water inrush disasters. Significant results have been achieved in the classification of disaster patterns (Lu 2017), determination of influencing factors (Li et al. 2017; Li and Wu 2019), and risk assessment of tunnel
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