围岩−支护结构时效性共同作用下运营隧道服役特性  

Service characteristics of operational tunnel under combined action of time effects of surrounding rock and supporting structure

作　　者：杜建明 房倩[1] 程荔琼 王军 DU Jianming;FANG Qian;CHENG Liqiong;WANG Jun(Tunnel and Underground Engineering Research Center of Ministry of Education,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]北京交通大学隧道及地下工程教育部工程研究中心,北京100044

出　　处：《中南大学学报（自然科学版）》2022年第10期4001-4011,共11页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金高铁联合基金重点支持项目(U1934210);北京市自然科学基金资助项目(8202037)。

摘　　要：为探究围岩与支护结构共同作用下运营隧道的服役特性,通过虚拟支护力法实现隧道开挖过程的可视化,考虑围岩时变、支护结构劣化及损伤的同时,构建围岩时变−支护结构性能退化共同作用下的力学分析模型。通过与既有研究成果及三维数值仿真结果对比分析,验证本文所提力学模型的正确性,然后探究围岩时变、支护结构劣化和损伤、支护结构厚度等参数影响下围岩−支护结构接触面位移及压力、支护结构服役寿命的变化规律。研究结果表明:围岩−支护结构接触面位移与围岩时变系数、支护结构劣化及损伤系数呈正相关,与支护结构厚度呈负相关;接触面压力与围岩时变系数及支护结构厚度呈正相关,与支护结构劣化及损伤系数呈负相关;支护结构寿命与围岩时变系数、支护结构劣化及损伤系数呈负相关,与支护结构厚度呈正相关;在不同条件下,支护结构服役寿命变化幅度与围岩时变系数变化幅度、支护结构劣化系数变化幅度、损伤系数变化幅度、厚度变化幅度的比值分别为1.3,0.278,0.061和0.787。To explore the service characteristics of the operational tunnel under the combined action of the surrounding rock and the supporting structure,the tunnel excavation process was visualized through the virtual supporting force method,and the time effect of the surrounding rock and the deterioration and damage of the supporting structure were considered at the same time.Then the mechanical analysis model under the combined effect of the time effect of the surrounding rock and the performance degradation of the supporting structure was established.The correctness of the proposed mechanical model was verified through the comparison and analysis of the existing research results and three-dimensional numerical simulation results.The influences of the time effect of surrounding rock,the deterioration and damage as well as the thickness of the supporting structure on the displacement and pressure of the contact surface between the surrounding rock and the supporting structure,and the service life of the supporting structure were explored.The results show that the displacement of the contact surface between the surrounding rock and the supporting structure is positively correlated with the time-varying coefficient of the surrounding rock and the deterioration and damage coefficients of the supporting structure,and is negatively correlated with the thickness of the supporting structure.The pressure of the contact surface is positively correlated with the time-varying coefficient of the surrounding rock and the thickness of the supporting structure,and is negatively correlated with the deterioration and damage coefficients of the supporting structure.The service life of the supporting structure is negatively correlated with the time-varying coefficient of the surrounding rock,the deterioration and damage coefficients of the supporting structure,and is positively correlated with the thickness of the supporting structure.Under different conditions,the ratios of the service life change amplitude of the supporting structure and

关 键 词：运营隧道 围岩时变 支护结构 服役性能 

分 类 号：TU43[建筑科学—岩土工程]