岩土力学2011，Vol.32Issue(1)：99-105,7.
成都地铁卵石层中盾构施工开挖面稳定性研究
Study of face stability of cobble-soil shield tunnelling at Chengdu metro
王明年 1魏龙海 2路军富 1朱招庚1
作者信息
- 1. 西南交通大学土木工程学院,610031,成都
- 2. 中交第二公路勘察设计研究院有限公司,武汉,430056
- 折叠
摘要
Abstract
In recent years, with China's social and economic development, more and more cities began to plan and build metres.Meanwhile, the metro construction encountered the sandy pebble soil in some cities, especially the running tunnels of Chengdu Metro line 1 and 2 are almost both need to cross the sandy cobble soil.According to the design, Chengdu metro No.l and No.2 lines will be constructed by mudding-type earth pressure balance shield.And during shield tunnelling, the face stability control that will be a key operation to ensure the construction can be carried through smoothly.Nowadays, the study of supporting earth pressure is mainly focused on sandy and clay soil; but the study involving the face movement and collapse of cobble-soil is seldom.So based on the heavily discrete characteristics of cobble-soil, the paper analyzes the shield tunnel face deformation and failure while the support pressure is lower than the limit pressure which constructed by using earth pressure balance method and the deformation and failure of excavated face by discrete element method.The results show that: (1) supporting earth pressure of tunnel face is lower than earth pressure at rest; (2) after the face loses stability, the slider ahead of the tunnel face is a surface body.The results will give reference to determine the face control pressure of shield tunnelling.关键词
卵石土/盾构隧道/开挖面稳定性/离散元分类
交通运输引用本文复制引用
王明年,魏龙海,路军富,朱招庚..成都地铁卵石层中盾构施工开挖面稳定性研究[J].岩土力学,2011,32(1):99-105,7.
