盾构隧道开挖面改进三维模型和临界支护压力研究

孔德森; 滕森; 赵明凯; 时健

doi:10.3973/j.issn.2096-4498.2023.09.003

隧道建设 >

2023 , Vol. 43 >Issue 9: 1463 - 1472

DOI: https://doi.org/10.3973/j.issn.2096-4498.2023.09.003

研究与探索

盾构隧道开挖面改进三维模型和临界支护压力研究

孔德森 ,
滕森 ,
赵明凯 ,
时健

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(1. 山东科技大学土木工程与建筑学院, 山东青岛 266590； 2. 山东科技大学山东省土木工程防灾减灾重点实验室, 山东青岛 266590)

孔德森(1977—)，男，山东滕州人，2004年毕业于大连理工大学，岩土工程专业，博士，教授，主要从事地铁与隧道工程施工安全感控技术方面的研究工作。 Email： dskong828@163.com。*通信作者：滕森， Email： skts89@sdust.edu.cn。

网络出版日期: 2023-10-16

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An Improved ThreeDimensional Model of Shield Tunnel Face and Its Stability Study

KONG Desen ,
TENG Sen ,
ZHAO Mingkai ,
SHI Jian

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(1.College of Civil Engineering and Architecture,Shandong University of Science and Technology,Qingdao 266590,Shandong, China;2.Shandong Key Laboratory of Civil Engineering Disaster Prevention and Mitigation, Shandong University of Science and Technology, Qingdao 266590, Shandong,China)

Online published: 2023-10-16

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摘要

为解决城市地铁隧道盾构掘进过程中开挖面稳定性较难准确评估的问题，以及针对目前采用极限平衡方法建立的模型无法准确描述隧道开挖面失稳破坏机制的现状，提出一种针对浅埋隧道的改进三维模型。通过将模型与物理试验和数值模拟进行对比，其偏差小于10%，验证改进模型的合理性和有效性。在此基础上，研究土壤参数、隧道直径和埋深对改进模型得出的临界支护压力和失效机制特征的影响规律。结果表明： 1）土壤的内摩擦角和黏聚力对临界支护压力影响显著； 2）由于土拱效应的存在，隧道埋深和直径在增大至临界值后，临界支护压力将保持不变； 3）相比于黏聚力和隧道埋深，土壤内摩擦角的改变对失效机制特征的影响更加显著。

关键词： 盾构隧道; 开挖面稳定性; 临界支护压力; 改进失效模型; 极限平衡法

本文引用格式

孔德森 , 滕森 , 赵明凯 , 时健 . 盾构隧道开挖面改进三维模型和临界支护压力研究[J]. 隧道建设, 2023 , 43(9) : 1463 -1472 . DOI: 10.3973/j.issn.2096-4498.2023.09.003

Abstract

Currently, it is challenging to accurately evaluate tunnel face stability during shield tunneling, and the limit equilibrium methodbased models cannot accurately describe the failure mechanism of tunnel face instability. Therefore, an improved threedimensional model for shallowburied tunnels is proposed. The results of the improved model are compared with the existing theoretical models, physical tests, and numerical simulations. The errors are less than 10%, validating the rationality of the proposed model. Furthermore, the influence of soil parameters, tunnel diameter, and burial depth on the critical support pressure and failure mechanism characteristics derived from the improved model is investigated. The results reveal the following: (1) The internal friction angle and cohesion of the soil significantly impact the critical support pressure. (2) The critical support pressure remains constant as the burial depth and diameter of the tunnel increase to a certain value, due to the soil arch effect. (3) The internal friction angle of the soil has a greater influence on the characteristics of the failure mechanism than cohesion and burial depth.

Key words： shield tunnel; tunnel face stability; critical support pressure; improved failure model; limit equilibrium method

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