高地应力软岩隧道长期稳定性分析
Analysis of Long-term Stability of Soft Rock Tunnel under High Geostress
邓云纲1
作者信息
- 1. 中铁第四勘察设计院集团有限公司,武汉 430063
- 折叠
摘要
研究目的:高地应力软岩具有明显的流变特性,流变过程中岩体参数随时间发生变化.本文结合梁王山隧道的设计施工方案,采用Cvisc模型对其施工过程及运营期间的围岩和支护的受力和变形情况进行分析,查明了隧道在施工阶段和长期运营阶段的应力、应变和变形特性以及隧道支护结构的内力与变形随时间发展规律.研究结论:(1)在软岩隧道工程施工中,施工时应对隧道初支拱脚处适当加固,控制拱脚变形;(2)不仅要保证施工期的安全,更需要关注隧道在后期运营过程中的长期稳定性;(3)需根据全寿命周期内的围岩流变稳定状态设计支护结构的刚度,从而确保隧道结构长期稳定;(4)本研究成果可为高地应力软岩隧道施工安全和长期稳定性研究提供参考.
Abstract
Research purposes:The soft rock under high geostress shows obvious property of rheology characteristic.Rock mass parameters change with time during rheological process.The paper considers the design and construction plan of the Liangwangshan Tunnel,and uses the Cvisc model to analyze the stress and deformation of the surrounding rock during its construction process and operation period.It identifies the stress,strain,and deformation characteristics of the tunnel during the construction and long-term operation stages,as well as the development law of the internal force and deformation of the tunnel support structure over time.Research conclusions:(1)During soft rock tunnel construction,the arch foot of the initial support should be appropriately reinforced to control the deformation.(2)It is not only necessary to ensure the safety during the construction period,but also to pay attention to the long-term stability of the tunnel during the later operation process.(3)The stiffness of the support structure needs to be designed based on the rheological stability state of the surrounding rock throughout the entire life cycle,to ensure the tunnel structure long-term stability.(4)The research results can provide a reference for the safe construction and long-term stability research of soft rock tunnel under high geostress.
关键词
软岩隧道/长期稳定性/流变/高地应力/数值模拟Key words
soft rock tunnel/long-term stability/rheological/high geostress/numerical simulation引用本文复制引用
基金项目
中铁第四勘察设计院集团有限公司科研项目(2017K074)
出版年
2024
NETL
NSTL
万方数据