盾构隧道洞周土压力颗粒流数值分析

doi:10.3969/j.issn.1674-0696.2015.05.06

重庆交通大学学报（自然科学版） ›› 2015, Vol. 34 ›› Issue (5): 29-32.DOI: 10.3969/j.issn.1674-0696.2015.05.06

盾构隧道洞周土压力颗粒流数值分析

邢心魁^1,2, 闫茂龙², 张坤鹏², 李迎²,张坚²

1. 广西岩土力学与工程重点实验室,广西桂林 541004; 2. 桂林理工大学土木与建筑工程学院,广西桂林 541004

收稿日期:2014-06-30 修回日期:2014-09-27 出版日期:2015-11-04 发布日期:2015-11-04
作者简介:邢心魁(1964—)，男，河南漯河人，教授，博士，硕士生导师，主要从事岩土工程与地下工程方面的研究。E-mail:597983647@qq.com。
基金资助:
国家自然科学基金项目（51068004）；广西岩土力学与工程重点实验室基金资助项目（11-CX-03）

Particle Flow Code Numerical Analysis on Earth Pressure of Shield Tunnels Cave

Xing Xinkui^1,2, Yan Maolong², Zhang Kunpeng², Li Ying², Zhang Jian²

1. Guangxi Key Laboratory of Geo-Mechanics & Geo-Technical Engineering, Guilin 541004, Guangxi, China; 2. School of Civil Engineering & Architecture, Guilin University of Science & Technology, Guilin 541004, Guangxi, China

Received:2014-06-30 Revised:2014-09-27 Online:2015-11-04 Published:2015-11-04

摘要/Abstract

摘要： 对盾构隧道洞周土压力的变化规律进行了数值模拟，研究了不同盾尾空隙、不同直径、不同埋深时隧道洞周土压力的分布规律，分析了隧道正上方土体的应力路径，并对隧道洞周土体竖向位移随埋深的变化规律进行了探讨。结果表明：盾尾空隙小于20 cm时，开挖对竖向土压力的影响区在2.7倍隧道直径范围内，土压力拱主要产生在隧道上部2倍隧道直径范围内；根据隧道正上方不同位置处土体的应力路径，将该区划分为3个区段：① 洞周松动区，② 稳定的压力拱区域，③ 土拱效应不明显的区域；随着隧道埋深的减小，其正上方的地表下沉量逐渐增大，而地表沉降的影响范围逐渐减小。

关键词: 隧道工程, 盾构隧道, 土压力, 数值分析, 盾尾空隙, 颗粒流

Abstract: Lots of numerical simulations were carried out on the change rule of earth pressure around the shield tunnel. The research work was about the distribution of the earth pressure around the tunnel considering the factors of shield tail void, diameter and buried depth. The soil’s stress path just above the tunnel was analyzed, in addition, exploring the change rule of soil’s vertical displacement under the condition of different buried depth around the tunnel. The results show that when the shield tail void is less than 20cm, the affected area of vertical earth pressure from excavation is within the range of soil of 2.7 times the tunnel diameter, and the soil arching mainly takes place within the range of soil of 2 times the tunnel diameter above the tunnel. According to the soil's stress path at different locations of the upper part of the tunnel, the region is divided into three sections, which are relative loose area around the tunnel, the stable pressure arch area and the area of inconspicuous soil arching effect. With the decrease of the embedded depth of the tunnel, the subsidence of the earth’s surface just above the tunnel is increased gradually, but the influence scope of the surface’s subsidence is decreased gradually.

Key words: tunnel engineering, shield tunnel, earth pressure, numerical analysis, shield tail void

中图分类号:

U451

邢心魁 , 闫茂龙, 张坤鹏, 李迎,张坚. 盾构隧道洞周土压力颗粒流数值分析[J]. 重庆交通大学学报（自然科学版）, 2015, 34(5): 29-32.

Xing Xinkui, Yan Maolong, Zhang Kunpeng, Li Ying, Zhang Jian. Particle Flow Code Numerical Analysis on Earth Pressure of Shield Tunnels Cave[J]. Journal of Chongqing Jiaotong University(Natural Science), 2015, 34(5): 29-32.

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盾构隧道洞周土压力颗粒流数值分析

Particle Flow Code Numerical Analysis on Earth Pressure of Shield Tunnels Cave

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