ISSN 2096-4498

   CN 44-1745/U

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Tunnel Construction >

2022 , Vol. 42 >Issue S1: 369 - 375

DOI: https://doi.org/10.3973/j.issn.2096-4498.2022.S1.042

Discussion on Scheme of Shield Tunneling through Active Fault Zone

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  • (1. Qingdao Conson Construction & Investment Co., Ltd., Qingdao 266111, Shandong, China;

    2. China Railway Siyuan Survey and Design Group Co., Ltd., Wuhan 430063, Hubei, China;

    3. National and Local Joint Engineering Research Center for Underwater Tunnel Technology, Wuhan 430063,

    Hubei, China; 4. Tongyan Civil Engineering Science and Technology Co., Ltd., Shanghai 200092, China;

    5. Shanghai Engineering Research Center of Underground Infrastructure Detection and Maintenance Equipment, Shanghai 200092, China)

Online published: 2022-08-23

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Abstract

The antifault effect of different measures is discussed and the key control indicators such as tunnel structural deformation, joint opening, dislocation form, steel bar stress, and bolt axial force under three various antifracture schemes are analyzed by taking the 2nd submarine tunnel of Jiaozhou bay as an example using case investigation and numerical simulation methods, so as to investigate the reasonable antifault design measures for the tunnel crossing the active fracture zone. The research results show the following: (1) Under fault action, the force and deformation laws of segment structures using three various antifault measures are basically the. The influence of fault action on the tunnel structure is mainly concentrated in the range from 30 m outside the upper wall boundary of the broken zone to 30 m outside the bottom wall boundary. (2) The overall force of the steel bars under the fault action shows a state of compressed top and bottom steel bars and tensioned two waist bars. The maximum tensile stress of the steel bar with a ring width of 1.5 m is 436 MPa, and the steel bar does not yield under the three working conditions. (3) The circumferential joint opening of the segment with a ring width of 1.5 m is 3.8 cm, which is 60%~70% less than the other two working conditions. (4) The antidislocation design plan is proposed with the segment ring width of 1.5 m and the seismic fortification area ranging from the left boundary of the hanging wall 2〖WT５《TNR#I》〗D〖WT５《TNR》〗 to the right boundary of the bottom wall 2〖WT５《TNR#I》〗D〖WT５《TNR》〗 (〖WT５《TNR#I》〗D〖WT５《TNR》〗 is 15.0 m). The research results have a certain reference effect on the research of anti dislocation schemes for shield tunneling through the fault zone with large dislocation momentum.

Key words： shield tunnel; large dislocation fault; deformation characteristics; anti dislocation measures; joint opening

Cite this article

LI Xiang, SUN Wenhao, SUN Zhou, CHEN Libao . Discussion on Scheme of Shield Tunneling through Active Fault Zone[J]. Tunnel Construction, 2022 , 42(S1) : 369 -375 . DOI: 10.3973/j.issn.2096-4498.2022.S1.042

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