Analysis of Surrounding Rock Deformation Control of Largespan Metro Tunnel Crossing Fault by Combined Tunneling Method

doi:10.3973/j.issn.2096-4498.2019.02.007

Tunnel Construction ›› 2019, Vol. 39 ›› Issue (2): 227-239.DOI: 10.3973/j.issn.2096-4498.2019.02.007

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Analysis of Surrounding Rock Deformation Control of Largespan Metro Tunnel Crossing Fault by Combined Tunneling Method

TANG Xiaojie^{1, 2}, SHI Lei³, CHEN Jiawei^{1, 2, *}, PENG Zhen³, LI Yuanhai^{1, 2}

(1.School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu,  China; 2. State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining and  Technology， Xuzhou 221116, Jiangsu, China; 3. China Communications Construction Company (Guangzhou) Ltd., Guangzhou 511458, Guangdong, China)

Received:2018-06-25 Revised:2018-12-03 Online:2019-02-20 Published:2019-03-05

Abstract

Abstract:

The surrounding rock deformation laws and grouting control effect of largespan XinxiuLiantang Port Tunnel on Shenzhen Rail Transit Line No. 2 are analyzed by FLAC3D numerical simulation method when adopting different combinations of doubleside drift method and CD method crossing fault. The analytical results show that: (1) The maximum displacement occurs at two key deformation control areas, i.e. the intersection of crown top between grade Ⅳ/Ⅴ surrounding rock boundary and the fault zone and the intersection of waist between grade Ⅴ surrounding rock and the fault zone, when tunnel crosses fault and fracture zone. (2) The deformation of surrounding rock is under effective control by adopting doubleside drift method when largespan metro tunnel crosses fault zone; and the maximum influencing scope of surrounding rock under actual construction method combination is 12.4 m. (3) The grouting around the fault and fracture zone has a good effect on surrounding rock deformation mode and control; and the shape of surrounding rock deformation area turned from a date pit to an uniform oval. (4) A quantitative description of the grouting control effect is proposed in surrounding rock displacement. The vertical displacement control rate of surrounding rock with 3 m grouting thickness reaches 51%, which shows a good surrounding rock deformation control effect.

Key words: largespan metro tunnel, fault, FLAC3D, construction method combination, grouting, surrounding rock deformation, monitoring

CLC Number:

U 45

TANG Xiaojie, SHI Lei, CHEN Jiawei, PENG Zhen, LI Yuanhai. Analysis of Surrounding Rock Deformation Control of Largespan Metro Tunnel Crossing Fault by Combined Tunneling Method[J]. Tunnel Construction, 2019, 39(2): 227-239.

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Analysis of Surrounding Rock Deformation Control of Largespan Metro Tunnel Crossing Fault by Combined Tunneling Method

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