深埋洞室围岩参数劣化的试验与数值模拟研究  

Degradation of surrounding rock parameters in deep buried caverns:experimental and numerical simulation study

作　　者：杨朝帅 李达强 Yang Chaoshuai;Li Daqiang(China Railway Tunnel Group Co.,Ltd.,Guangzhou 511458,Guangdong,China;Guangdong Provincial Key Laboratory of Intelligent Monitoring and Maintenance of Tunnel Structure,Guangzhou 511458,Guangdong,China;China Railway Tunnel Consultants Co.,Ltd.,Guangzhou 511458,Guangdong,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：《岩土工程技术》2025年第2期216-224,共9页Geotechnical Engineering Technique

基　　金：中国中铁股份有限公司科技研究开发计划(cz 02-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：洞室开挖会导致围岩刚度和强度参数劣化,而深埋洞室开挖过程中围岩参数劣化规律尚不明确。为此,通过对木寨岭隧道围岩的跨孔声波测试,揭示洞室开挖过程中参数劣化的空间分布规律,同时建立考虑围压和塑性应变影响的围岩参数劣化模型(CSS模型)并应用到该工程数值模拟中。结果表明:洞室开挖过程中围岩波速下降,可推断出围岩参数发生劣化;采用CSS模型能更好地反映出这种参数劣化现象;围岩参数劣化的空间分布规律可分区表示,越靠近洞壁,参数劣化程度越高,塑性区之外区域,在围压足够大的情况下会出现参数强化的情况。Tunnel excavation can lead to degradation of the stiffness and strength parameters of the surrounding rock,while the degradation law of the surrounding rock parameters during deep buried tunnel excavation is still unclear.Therefore,by conducting cross hole acoustic testing on the surrounding rock of the Muzhailing Tunnel,the spatial distribution pattern of parameter degradation during the excavation process of the tunnel cavern was revealed.At the same time,a parameter degradation model(CSS model)consid-ering the effects of confining pressure and plastic strain was established and applied to the numerical simulation of the project.The res-ults showed that the wave velocity of the surrounding rock decreased during the excavation process,and the degradation pattern of the surrounding rock parameters can be inferred.The use of CSS models can better reflect this parameter degradation phenomenon.The spatial distribution pattern of the deterioration of surrounding rock parameters can be represented by zones.The closer it is to the tun-nel wall,the higher the degree of parameter degradation.In areas outside the plastic zone,parameter strengthening may also occur un-der sufficient confining pressure.

关 键 词：深埋洞室 围岩劣化 弹塑性 跨孔声波测试 

分 类 号：U452[建筑科学—桥梁与隧道工程]