考虑炭质片岩流变特性的隧道支护时机优化研究  

Optimization of Tunnel Supporting Time Considering Rheological Properties of Metamorphic Schist

作　　者：李细咏[1] 冯凌[1] 韩志强[2,3] 

机构地区：[1]湖北省交通规划设计院,武汉430051 [2]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,武汉430071 [3]中国电力科学研究院,北京100055

出　　处：《土工基础》2015年第3期100-104,共5页Soil Engineering and Foundation

摘　　要：对于炭质片岩这种具备典型流变特性的岩体,采用Burgers模型与Mohr-Coulomb准则串联型式的修正Burgers模型,能够较好地表征其黏弹塑性变形特点。通过离散元数值模拟方法及反分析手段,对挤压变形明显的炭质片岩区域隧道段落进行了流变参数辨识,进而讨论了炭质片岩与支护间的相互作用机理。最后综合数值分析、回归模型预测及现场监测结果,研究了炭质片岩区域隧道围岩支护时机的优化。For soft rock that having rheological properties,like the carbonaceous schist,the modified Burgers model,which is the combination of Burgers model and Mohr-Coulomb model,can characterize its visco-elastic-plastic deformation behavior.In a tunnel excavation project,the squeezed deformation zone with soft rock mass was numerical analyzed and the rheological model parameters are calibrated throughout the back analysis.The paper discusses the interactions between the carbonaceous schist rock mass and the supporting structures.The optimization of the time for the tunnel excavation supporting is made possible by using the numerical analysis results,regression analysis results and the construction monitoring data.

关 键 词：炭质片岩 隧道 流变 相互作用 支护时机 

分 类 号：TU573[建筑科学—建筑技术科学]