ISSN 2096-4498
CN 44-1745/U
Tunnel Construction ›› 2023, Vol. 43 ›› Issue (12): 2089-2097.DOI: 10.3973/j.issn.2096-4498.2023.12.011
Previous Articles Next Articles
NIU Guoliang
Online:
Published:
Abstract: Mountain tunnels bored by tunnel boring machines(TBMs) at high water levels often encounter issues, such as joint leakage and cracking. Therefore, a novel drainage technology incorporating pressure relief valves are proposed to address these challenges and protect the surrounding groundwater environment. This technology aims to control the drainage volume and reduce groundwater pressure behind tunnel linings. First, a field test is conducted in the Daxiangshan tunnel on the FuzhouChangle airport intercity railway. The results indicate that with a drainage hole spacing of 3 m and the relief valve pressure set to zero, the water pressure behind the segmental lining can be effectively reduced to 30% of the hydrostatic pressure. Furthermore, the groundwater drainage volume is maintained at 3.144 m3/(d·m). Second, a hydraulic coupling numerical calculation model is established by integrating a pressure relief drainage unit. Here, a pressurerelief valve is installed in the arch foot drainage hole. The numerical results are compared with field test data, maintaining a relative error of less than 8%. Finally, a parameter analysis is performed to examine the effects of the drainage hole spacing and relief valve pressure on the tunnel water drainage volume and the water pressure behind the segmental linings. The findings are as follows: (1) Reducing the tunnel drainage hole spacing from 15 m to 3 m increases the water pressure reduction rate at the invert from 40% to 78% and increases the water drainage volume from 1.284 m3/(d·m) to 3.362 m3/(d·m). (2) With a drainage hole spacing of 3 m, increasing the valve pressure from 0 to 800 kPa reduces the water drainage volume from 3.362 m3/(d·m) to 0.678 m3/(d·m). Concurrently, the groundwater pressure on the segmental lining increases linearly, and the water pressure at the invert shows a significant variation, with the growth rate increasing from 0% to 77%.
Key words: mountain tunnel, tunnel boring machine, tunnel waterproof and drainage, groundwater pressure, pressure relief valve
NIU Guoliang. Application of Controlled Drainage Using Pressure Relief Valves for Single-Shield Tunnel Boring Machine Segmental Linings[J]. Tunnel Construction, 2023, 43(12): 2089-2097.
0 / / Recommend
Add to citation manager EndNote|Ris|BibTeX
URL: http://www.suidaojs.com/EN/10.3973/j.issn.2096-4498.2023.12.011
http://www.suidaojs.com/EN/Y2023/V43/I12/2089
Bearing Analysis of Tunnel Surrounding Rocks for Tunnel Boring Machine Gripper and Treatments of Unfavorable Geology
Prediction Model of Tunnel Boring Machine′s Tunneling Parameters Based on Multimodal Control Strategy
DataDriven Collaborative DecisionMaking Technology for Manufacturing and Operation Maintenance of Tunnel Boring Machine
Key Technologies of Excavation Blind Area Treatment for NonCircular Tunnel Boring Machine in Composite Strata
Application of Improved Convolution Neural Network in Gearbox Wear Status Recognition of Tunnel Boring Machines
Design and Application of Seismic Isolation Structure for Mountain Tunnels in EarthquakeProne Areas