考虑应力路径的深埋高地温隧洞黏弹-塑性围岩解析解
Considering the Analytical Solution of Viscoelastic-plastic Surrounding Rock in Deep Buried Hydraulic Tunnels at High Ground Temperature under Stress Path
王家辉 1姜海波 2喻天龙3
作者信息
- 1. 石河子大学水利建筑工程学院,石河子 832003
- 2. 新疆农业大学水利与土木工程学院,乌鲁木齐 830052
- 3. 新疆兵团勘测设计院(集团)有限责任公司,石河子 832003
- 折叠
摘要
高地温深埋水工隧洞黏弹-塑性岩体中,由于高温环境的影响和隧洞降温等,致使围岩产生一定的温度应力.因此研究高地温隧洞围岩解析解时必须研究温度应力对围岩塑性区以及应力应变的影响.基于广义Kelvin模型与Bingham模型组成的高地温深埋水工隧洞黏弹塑性围岩力学模型,并在考虑应力路径对围岩与支护的影响下,结合高地温环境中温度应力对围岩与衬砌的影响,进而推导高地温环境热力耦合作用下围岩应力、应变、洞壁位移以及围岩塑性区半径的解析解.基于新疆某高地温水工隧洞工程进行分析与计算,对温度、围岩应力应变及塑性区半径的关系展开理论计算与分析.结果表明:考虑温度应力后计算得到的围岩位移更小.当隧洞内温度变化到达一定量时,所产生的温度应力可能会对围岩与衬砌相互作用的稳定性产生影响.
Abstract
In the viscoelastic-plastic rock mass of the hydraulic tunnel buried deep in high ground temperature,due to the influence of high temperature environment and tunnel cooling,certain temperature stress is generated in the surrounding rock.Therefore,when studying the analytical solution of surrounding rock of high geothermal tunnel,it is necessary to study the influence of temperature stress on the plastic zone and stress strain of the surrounding rock.Based on the mechanical model of viscoelastic-plastic surrounding rock of high-geothermal deep-buried hydraulic tunnel composed of generalized Kelvin model and Bingham model,and considering the influence of stress path on surrounding rock and support,combined with the influence of temperature stress on surrounding rock and lining in high-geothermal environment,the analytical solutions of stress,strain,cave wall displacement and radius of plastic zone radius of sur-rounding rock under the thermodynamic coupling of high-geothermal environment were derived.Based on the analysis and calculation of a highland temperature hydraulic tunnel project in Xinjiang,the relationship between temperature,stress strain and plastic zone radius of surrounding rock was theoretically calculated and analyzed.The results show that the displacement of the surrounding rock calculated after considering the temperature stress is smaller.When the temperature change in the tunnel reaches a certain amount,the resulting temperature stress may affect the stability of the surrounding rock interaction with the lining.
关键词
水工隧洞/应力路径/温度应力/温度场/黏弹-塑性/让压支护Key words
hydraulic tunnels/stress paths/temperature stress/temperature field/viscoelastic-plasticity/let the pressure support引用本文复制引用
基金项目
国家自然科学基金(51769031)
兵团区域创新引导计划(2021BB004)
出版年
2024
NETL
NSTL
万方数据