Experimental research on deformation and failure mechanism of deep-buried clay tunnels in urban areas

被引：0

作者：

Qiu J. ^{[1
]}

Shen Y. ^{[1
,2
]}

Zhao H. ^{[1
]}

Zhu Z. ^{[1
]}

Yu B. ^{[1
]}

Dong J. ^{[3
]}

Gou A. ^{[1
]}

机构：

[1] Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, Southwest Jiaotong University, Sichuan, Chengdu

[2] National Engineering Research Center of Geological Disaster Prevention Technology in Land Transportation, Southwest Jiaotong University, Sichuan, Chengdu

[3] China Railway Siyuan Survey and Design Group Co.，Ltd., Hubei, Wuhan

来源：

Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | 2023年 / 42卷 / 11期

关键词：

deep-buried clay tunnel; deformation mechanism; failure characteristic; model test; tunnel engineering;

D O I：

10.13722/j.cnki.jrme.2022.1316

中图分类号：

学科分类号：

摘要：

In order to investigate the deformation characteristic and failure mechanism of deep-buried clay tunnels in urban，the similarity model test was conducted in this paper. The full-section excavation apparatus of tunnels was used in the model test. The displacement，ground pressure and strain devices were adopted to explore the tunnel mechanical responses under different buried depths. The failure modes of the tunnel lining were analyzed，and the effectiveness of model test was verified by numerical simulation. The results indicate soil cracks induced by compression-shear stress are distributed above the tunnel face after tunnel is excavated. The uneven longitudinal settlement of soil is induced by excavation，and the settlement near the entrance of tunnel is the most significant. Under the buried depth of 50–500 m，the soil settlement decreases with the increase of the depth，and the attenuation magnitude of the ground pressure in the vertical direction is greater than that in the horizontal direction. The ground pressure is the most significant at the tunnel invert，followed by the right tunnel waist and the crown. The left tunnel waist has the smallest ground pressure. The bearing capacity of the tunnel lining reaches the limit when the buried depth is 150 m. The damage of the right part of the lining is more severe than that on the left part under asymmetric loads，and the convergence deformation of the lining is similar to“horizontal egg”shape. The convergence of the tunnel crown at the entrance of the tunnel is the most significant，while the largest horizontal expansion occurs at the end of the lining. The test results reveal the interaction between the surrounding soil and tunnel structure of deep-buried clay tunnel. It will provide references for the safety of deep-buried metro tunnel construction. © 2023 Academia Sinica. All rights reserved.

引用

页码：2765 / 2775

页数：10

共 34 条

[1] CHENG Xiangsheng, FU Yanbin, CHEN Xi, Et al., Progress in underground space construction technology and technical challenges of digital intelligence[J], China Journal of Highway and Transport, 35, 1, pp. 1-12, (2022)
[2] ZHU Hehua, DING Wenqi, QIAO Yafei, Et al., Issues and challenges in urban underground space utilization in China[J], Earth Science Frontiers, 26, 3, pp. 22-31, (2019)
[3] GB 51358—2019 Standard for urban underground space planning, (2019)
[4] HUANG Qiangbing, PENG Jianbing, WANG Feiyong, Et al., Issues and challenges in the development of urban underground space in adverse geological environment[J], Earth Science Frontiers, 26, 3, pp. 85-94, (2019)
[5] QIU J T, SHEN Y S, ZHANG X, Et al., Simplified method for predicting time-dependent behavior of deep-buried tunnel considering tunnel excavation rate and stress release effects[J], International Journal of Applied Mechanics, 14, 5, (2022)
[6] SUN Zhenyu, ZHANG Dingli, HOU Yanjuan, Research on mechanical property of synergistic effect of tunnel composite support structure[J], Journal of the China Railway Society, 41, 8, pp. 131-142, (2019)
[7] LI Yingming, ZHAO Chengxing, LIU Zenghui, Et al., Research on layered evolution law of surrounding rock bearing layers and strength analysis of“layer-double arch”bearing structure[J], Chinese Journal of Rock Mechanics and Engineering, 39, 2, pp. 217-227, (2020)
[8] CHANG Gang, PAI Lifang, PANG Weijun, Et al., Study on the effect on deformation of the surrounding rock induced by deep-buried tunnelling under hard rock combination conditions[J], Modern Tunnelling Technology, 58, 5, pp. 73-77, (2021)
[9] CAI Wuqiang, LIANG Wenhao, ZHU Hehua, Three-dimensional and nonlinear face extrusion effects of deep-buried rock tunnels under excavation unloading[J], Chinese Journal of Rock Mechanics and Engineering, 40, 9, pp. 1868-1883, (2021)
[10] WANG Feiyang, ZHOU Kaige, FANG Yong, Et al., Analysis of surrounding-rock disturbance caused by TBM excavation of deep-buried railway tunnel[J], Tunnel Construction, 41, 2, pp. 240-247, (2021)

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