鄂北地区隧道洞口坡积土边、仰坡变形机制与进洞技术研究

达晓伟; 邵珠山; 高怀鹏; 许鹏; 王新宇; 宋林

doi:10.13544/j.cnki.jeg.2016.03.017

鄂北地区隧道洞口坡积土边、仰坡变形机制与进洞技术研究

doi: 10.13544/j.cnki.jeg.2016.03.017

达晓伟¹,
邵珠山^1, ,,
高怀鹏²,
许鹏²,
王新宇¹,
宋林^1,3

1.
西安建筑科技大学西安 710055;
2.
中交第一公路工程局有限公司北京 100024;
3.
中国中铁一局集团有限公司西安 710054

基金项目:

国家自然科学基金项目(10772143),陕西省科技统筹创新工程计划项目(2013KTCQ01-16)资助

详细信息

作者简介:
达晓伟(1990-),男,硕士,主要从事隧道与地下工程研究工作.Email:daveyda@sina.cn

通讯作者:
邵珠山(1968-),男,博士,教授,主要从事隧道与地下工程方面的教学与研究工作.Email:shaozhushan@xauat.edu.cn

中图分类号: TU43
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- 被引次数: 0
出版历程
- 收稿日期: 2015-02-09
- 修回日期: 2015-05-13
- 刊出日期: 2016-06-25

DEFORMATION MECHANISM OF SLOPE COVERED WITH CLINOSOL AT TUNNEL ENTRANCE AND ASSOCIATED EXCAVATION TECHNOLOGY IN NORTH HUBEI PROVINCE

1.
Xi'an University of Architecture and Technology, Xi'an 710055;
2.
China First Highway Engineering Co., Ltd., Beijing 100024;
3.
China Railway First Group Co., Ltd., Xi'an 710054

摘要

摘要: 坡积土隧道洞口边、仰坡在开挖后自稳能力差,且受隧道开挖影响,易发生破坏,导致隧道工程无法正常施工,并带来经济损失、危害施工人员安全。本文以香山隧道为工程背景,依据隧址地形地质,建立了隧道洞口边、仰坡的三维仿真模型,结合隧道进洞开挖,分析了洞口边、仰坡的位移和应力变化过程,研究了隧道开挖对边、仰坡的影响,优化了隧道进洞方案。研究结果表明,边、仰坡开挖坡度与原始坡度突变处会产生应力集中并形成贯通的潜在滑移面,隧道开挖对仰坡变形影响较大,坡形坡度对隧道洞口边、仰坡稳定性具有显著影响,放缓坡度和采用分步台阶开挖可有效改善边坡应力应变状态。
- 隧道 /
- 边、仰坡 /
- 坡积土 /
- 进洞技术
Abstract: The slope with colluvial soil near the entrance of tunnels has poor self-stability after excavation and is influenced by tunnel excavation. Therefore landslides can occur frequently, which can bring economic losses and endanger the safety of construction workers. This paper is based on Xiangshan tunnel and conduct three-dimensional finite element numerical simulation model on the basis of tunnel site topography and geology. It analyzes the changing processes of displacement and stress of slope near tunnel entrance and the influence of tunnel excavation to slope. Then, it optimizes the excavation scheme of tunneling. The research result shows that the abrupt change of gradient between excavation slope and original slope induces stress concentration and forms potential slip surface. Then, the tunnel excavation can impact greatly on deformation, stress and strain of front slope. Excavating slope in layers can effectively improve the stress-strain state of the slope. An appropriate shape of slope has a significant influence on stability of slope near tunnel entrance.
- Tunnel entrance /
- Slope /
- Colluvial soil /
- Excavation

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