Theoretical Analysis of Longitudinally-inclined Shield Tunnel Face Stability in Dense Sand Stratum

被引：0

作者：

Cheng C. ^{[1
,2
]}

Zhao W. ^{[3
]}

Wang Y.-C. ^{[1
,4
]}

Lu B. ^{[3
]}

Han J.-Y. ^{[5
]}

Chen Y. ^{[6
]}

Cheng S.-G. ^{[7
]}

机构：

[1] School of Mechanics and Civil Engineering, China University of Mining and Technology, Jiangsu, Xuzhou

[2] School of Rail Transportation, Soochow University, Jiangsu, Suzhou

[3] School of Resources and Civil Engineering, Northeastern University, Liaoning, Shenyang

[4] State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Jiangsu, Xuzhou

[5] School of Civil Engineering, Shandong Jianzhu University, Shandong, Jinan

[6] School of Civil Engineering and Architecture, Xi'an University of Technology, Shaanxi, Xi'an

[7] Sinohydro Bureau 6 Co. Ltd., Liaoning, Shenyang

来源：

Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | 2023年 / 36卷 / 04期

基金：

中国国家自然科学基金;

关键词：

active limit face support pressure; dense sand stratum; limit equilibrium theory; longitudinal inclination angle; tunnel engineering;

D O I：

10.19721/j.cnki.1001-7372.2023.04.014

中图分类号：

学科分类号：

摘要：

The prediction of shield tunnel face support pressure is one of the core issues for the stability analysis of tunnel engineering. Current studies mainly focused on the failure mechanism of horizontal shield tunnel face. The impact of longitudinal inclination angles on the tunnel face was rarely considered. In this study, a scries of three-dimensional analytical models were conceived based on the observations of previous laboratory tests and the limit equilibrium theory, which can calculate the active limit face support pressure of shield tunnel in dense sand stratum within three tunneling conditions, i. e., upward tunneling, horizontal tunneling and downward tunneling. The expression of limit face support pressure was deduced combining with the earth pressure theory of Terzaghi. The characteristics of failure mode and face support pressure with different longitudinal inclination angles were investigated by finite difference method Flac3D50. The core parameters (the height coefficient of log-spiral and the inclination angle of the slip surface) of the proposed model are determined by numerical simulations and previous laboratory tests. The efficacy of the proposed model was evaluated by comparing with the solutions of other analytical methods. The results indicate that the area of failure zone is gradually enlarged from the downward slope to upward slope, and the corresponding limit face support pressure linearly increases within two stages. The increment of face support pressure is obviously enhanced from horizontal to upward slope. In addition, the face support pressure increases simultaneously with the increasing of tunnel diameter, and the impact of tunnel diameter on face support pressure is more significant for the upward tunneling condition. This study can provide some reference for the tunneling of shield machines. © 2023 Xi'an Highway University. All rights reserved.

引用

页码：158 / 168

页数：10

共 25 条

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