理论与试验研究

预应力锚杆支护深埋隧道围岩应变软化弹塑性分析

  • 邹金锋 ,
  • 伍钦铧
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  • 中南大学 土木工程学院,长沙 410075
邹金锋(1978—),男,河南信阳人,博士,教授,主要从事岩土与地下工程稳定性分析方法与加固关键技术的研究。E-mail:zoujinfeng_csu@163.com
伍钦铧(1999—),男,湖南邵阳人,硕士生,主要从事岩土与地下工程稳定性分析方法与加固关键技术的研究。E-mail:214812353@csu.edu.cn

收稿日期: 2024-08-23

  网络出版日期: 2025-06-13

基金资助

国家重点研发计划(2017YFB1201200);南昌轨道交通集团2020年度科研计划项目(2020HGKYB002)

Strain-Softened Elastoplastic Analysis of Surrounding Rocks in the Deep Tunnel under Pre-Stressed Anchor Support Conditions

  • Zou Jinfeng ,
  • Wu Qinhua
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  • School of Civil Engineering, Central South University, Changsha 410075, P.R. China

Received date: 2024-08-23

  Online published: 2025-06-13

摘要

为探明富水地层条件下预应力锚杆对隧道支护时的力学状态,以深埋隧道为例,基于三维Hoek-Brown屈服准则,考虑水力耦合及围岩应变软化的影响,将预应力锚杆视为带有锚垫板及两端应变不为零的被动锚杆模型,对隧道围岩进行了弹塑性分析,由此采用粘结-滑移理论建立了预应力锚杆剪切应力分布及端部预应力的数值计算方法,并通过与相关工程案例计算结果的对比分析,验证了本文计算方法的合理性。同时,依托实际工程对不同因素影响下围岩应力和位移的变化规律进行参数分析。结果表明:本文方法计算得到的锚杆轴力最大值、隧道表面力和锚杆中性点位置均与所选取工程案例的监测值拟合良好,且当锚杆剪切应力达到隧道壁峰值应力时,在隧道壁附近锚杆与围岩之间会发生解耦现象;依托实际工程反映了本文方法可有效解决深埋隧道预应力锚杆在工程中的设计计算问题,且预应力锚杆安装后可有效减小围岩变形,相比被动锚杆,其支护效果更好,研究成果可为类似工程地质条件下深埋隧道支护设计提供理论指导。

本文引用格式

邹金锋 , 伍钦铧 . 预应力锚杆支护深埋隧道围岩应变软化弹塑性分析[J]. 地下空间与工程学报, 2025 , 21(3) : 759 -773 . DOI: 10.20174/j.JUSE.2025.03.03

Abstract

In order to investigate the mechanical state of pre-stressed anchors for tunnel support under water-rich ground conditions, an elastoplastic analysis of the tunnel surrounding rock was carried out based on the three-dimensional Hoek-Brown failure criterion, considering the effects of hydraulic coupling and strain softening of the surrounding rock, and considering the pre-stressed anchors as a passive anchor model with anchor pads and non-zero strain at both ends. The numerical calculation method of shear stress distribution and end prestress of prestressing anchor was established by using bond-slip theory. Through the comparison and analysis of the calculation results of relevant engineering cases, the rationality of the calculation method in this study is verified. At the same time, parametric analysis is carried out on the change law of surrounding rock stress and displacement under the influence of different factors by relying on the actual project. The results show that: The maximum values of anchor shaft force, tunnel surface force, and anchor neutral point are well-fitted with the monitoring values of the selected engineering cases. When the anchor shear stress reaches the peak stress of the tunnel wall, the decoupling phenomenon occurs between the anchor and the surrounding rock near the tunnel wall. The actual project reflects that the method of this study can effectively solve the design calculation problem of pre-stressed anchors in the deep tunnel, and the pre-stressed anchors can effectively reduce the surrounding rock deformation after installation. Compared with the passive anchor, its support effect is better. The study results can theoretical guidance for the design of the deep tunnel support under similar engineering geological conditions.

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