ISSN 2096-4498
CN 44-1745/U
Tunnel Construction ›› 2021, Vol. 41 ›› Issue (10): 1801-1808.DOI: 10.3973/j.issn.2096-4498.2021.10.020
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LI Zengjun
Online:
Published:
Abstract: To further improve the waterproof capability of underwater tunnels with superdeep water and various geological conditions, comparison is made between immersed and shield tunnels based on existing structures and construction technologies. A new type of watershield machine and relevant tunneling technology (guidedshield tunneling) are proposed based on basic technical element extraction and innovation methods. For the guidedshieldtunneling method, guided tubes are laid in advance as waterproof structures. Subsequently, the water shield tunnels in the tubes to drain, thus creating a dry environment to conduct segment erection. Finally, pressurized grouting is employed to fill the gaps, thus integrating the guided tubes and tunnel segments to form the main tunnel structures. This method has many advantages, including low requirements on ground conditions, adaptability to various waterhead pressures, and good waterproof performance. Thus, this method improves assembly construction rate and the standardization level of components, making it a potential mainstream technique in underwater tunneling. The comparative results of economic indexes show that: (1) the cost of waterproof structures requires a greater portion of the total cost of the guidedshieldtunneling method than that in the shield or immersed tunneling method; (2) the cost of soil excavation in the guidedshield tunneling method is much less than that in the shield method; (3) the cost of concrete and main structures in the guidedshield tunneling method is much less than that in the immersed tunneling method; thus, the guidedshield tunneling method has good economic benefits.
Key words: underwater tunnel, guiding tube, water shield, tunneling method, tunnel engineering
CLC Number:
U 45
LI Zengjun. GuidedShield Tunneling Method: An Innovative Thought on Underwater Tunneling Method[J]. Tunnel Construction, 2021, 41(10): 1801-1808.
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http://www.suidaojs.com/EN/Y2021/V41/I10/1801
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