隧道锚固系统的协同作用及设计方法

孙振宇; 张顶立; 房倩

doi:10.6052/j.issn.1000-4750.2018.03.0160

隧道锚固系统的协同作用及设计方法

北京交通大学城市地下工程教育部重点实验室, 北京 100044

基金项目: 中央高校基本科研业务费专项资金项目（2018YJS125）；国家重点研发计划项目（2017YFC0805401）；国家自然科学基金项目（51738002）

详细信息

作者简介:
孙振宇(1993-),男,湖北天门人,博士生,主要从事隧道及地下工程方面的研究(E-mail:15115278@bjtu.edu.cn);房倩(1983-),男,山东淄博人,副教授,博士,博导,主要从事隧道结构设计方面的研究(E-mail:qfang@bjtu.edu.cn).

通讯作者:
张顶立(1963-),男,江苏徐州人,教授,博士,博导,从事隧道及地下工程研究(E-mail:zhang-dingli@263.net).

中图分类号: U45;U455.71
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出版历程
- 收稿日期: 2018-03-19
- 修回日期: 2018-10-22
- 刊出日期: 2019-05-24

THE SYNERGISTIC EFFECT AND DESIGN METHOD OF TUNNEL ANCHORAGE SYSTEM

Key Laboratory for Urban Underground Engineering of Ministry of Education, Beijing Jiaotong University, Beijing 100044, China

摘要

摘要: 基于隧道围岩的复合结构特性，阐明了隧道锚固系统协同作用原理，建立了锚固体系协同作用力学模型，得到了锚固体系与围岩相互作用的全过程解答。隧道围岩由内部稳定性较差的浅层围岩和外侧承载能力较强的深层围岩复合而成，锚杆通过"组合梁"或"压缩拱"效应形成"围岩整体结构"，锚索则将此结构悬吊至外侧稳定的深层围岩，其协同作用核心为调动深层围岩承载；基于锚杆参数敏感性分析，指出增大锚杆长度、预应力以及布置密度可显著减小围岩变形，而锚杆直径对围岩变形影响较小，计算表明锚杆长度以穿过浅层围岩伸入深层围岩第1组结构层为宜，合理的锚杆参数取值具有明显的匹配效应；锚固体系协同作用本质为变形协调和荷载的合理分配，锚杆、锚索支护参数相互匹配时能充分发挥组合构件效能，提高围岩稳定性；将围岩变形量和支护协同度作为评价指标，建立了锚固体系协同效果评价体系，并提出了基于锚固系统协同作用的隧道锚固参数确定方法，通过具体算例验证了该文的合理性和可靠性。该文研究成果对隧道锚固系统的协同作用给出了全面认识，可为隧道和地下工程中锚固体系的定量设计提供理论依据。
- 隧道工程 /
- 复合围岩结构 /
- 锚固体系 /
- 协同作用 /
- 设计方法 /
- 理论分析
Abstract: Based on the compound structural characteristics of tunnel surrounding rock, the principle of anchoring system synergistic effect is illuminated, and a corresponding mechanical model is established. The whole process of the interaction between an anchoring system and surrounding rock is solved. Tunnel surrounding rock is a composite of the internal instable surrounding rock and the external surrounding rock with strong load-bearing capacity. Rockbolt forms ‘a surrounding rock massive structure’ through a ‘composite beam’ or ‘compression arch’ effect. This structure is suspended to external stable surrounding rock by an anchor, and the core of synergy is to mobilize external surrounding rock bearing. The sensitivity analysis of bolt parameter indicates that increasing the length, prestress and density of a rockbolt can significantly reduce the deformation of surrounding rock, while its diameter has little effect on surrounding rock deformation. Calculations show that:appropriate length lies in passing through the internal surrounding rock and stretching into the first structure layer of external surrounding rock, and the reasonable values of bolt parameters have an obvious matching effect. The synergistic effect essence of an anchoring system is its deformation coordination and load rational distribution. The parameters of rockbolt and cable matching each other can give a full play to the assembly efficiency and improve the stability of surrounding rock. Taking the surrounding rock deformation and support synergy degree as evaluation indices, the synergistic effect evaluation system of a tunnel anchorage system is put forward, then the determination method of tunnel anchorage parameters is proposed based on anchoring system synergy. The research results give a comprehensive understanding of synergistic effect of a tunnel anchorage system, which can provide a theoretical basis for the quantitative design of the anchoring system in tunnel and underground engineering.
- tunnelling engineering /
- compound structure of surrounding rock /
- anchorage system /
- synergistic effect /
- design method /
- theoretical analysis

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