基于现场监测与数值模拟的高地应力软岩隧道支护策略研究  

Support Strategy for High Ground Stress Soft Rock Tunnel Based on on site Monitoring and Numerical Simulation

作　　者：杨朝帅 李达强 牛富生 YANG Chaoshuai;LI Daqiang;NIU Fusheng(China Railway Tunnel Group Co.,Ltd.,Guangzhou,Guangdong 511458,China;Guangdong Provincial Key Laboratory of Intelligent Monitoring and Maintenance of Tunnel Structure,Guangzhou,Guangdong 511458,China;China Railway Tunnel Consultants Co.,Ltd.,Guangzhou,Guangdong 511458,China)

机构地区：[1]中铁隧道局集团有限公司,广东广州511458 [2]广东省隧道结构智能监控与维护企业重点实验室,广东广州511458 [3]中铁隧道勘察设计研究院有限公司,广东广州511458

出　　处：《水利与建筑工程学报》2025年第1期154-160,共7页Journal of Water Resources and Architectural Engineering

基　　金：中国中铁股份有限公司科技研究开发计划(cz02-专项-02,2021-重点-44);广州市科技计划市校(院)企联合资助项目(2024A03J0981);中铁隧道局集团科技创新计划(隧研合2021-06)。

摘　　要：甘肃定西市木寨岭隧道是典型的高地应力软岩隧道,建设过程中出现了大变形侵入限界、支护结构破坏等极端灾害情况。为研究高地应力软岩隧道大变形灾害治理方法,以木寨岭隧道软岩变形控制试验段为工程背景,通过现场试验、监控量测、数值模拟等方法,分析高地应力软岩隧道的变形特征和不同支护方案下的支护效果。结果表明:预应力锚索安装锚固后立即提供主动支护力,变形过程中提供被动支护力,同时自身具有较大强度,是理想的前期支护构件;采用以预应力锚索为核心的主动支护方案后变形比原被动支护变形减小了77%;隧道开挖后径向应力与变形呈负相关关系,预应力锚索提早介入围岩应力释放过程,可有效约束围岩变形,围岩塑性区显著下降。The Muzhailing Tunnel in Gansu Dingxi is a typical high stress soft rock tunnel,and extreme disasters such as large deformation invading the limit and damage to the supporting structure occurred during the construction process.In order to analyze the treatment methods for large deformation disasters in high stress soft rock tunnels,this work takes the soft rock deformation control test section of Muzhailing Tunnel as the engineering background,the deformation characteristics of high stress soft rock tunnels and the support effects under different support schemes were analyzed through on-site experiments,monitoring measurements,numerical simulations and other methods.The results indicate that prestressed anchor cables provide active support force immediately after installation and anchoring,and passive support force during deformation.At the same time,they have high strength and are ideal early support components.After adopting the active support scheme with prestressed anchor cables as the core,the deformation was reduced by 77% compared to the original passive support.After tunnel excavation,there is a negative correlation between radial stress and deformation.Pre-stressed anchor cables intervene in the stress release process of surrounding rock in advance,which can effectively constrain the deformation of surrounding rock and significantly reduce the plastic zone of surrounding rock.

关 键 词：高地应力 软岩隧道 隧道支护 数值模拟 

分 类 号：U455.7[建筑科学—桥梁与隧道工程]