摘要
文章基于西原模型,利用对应原理,建立非对称性荷载条件下的围岩径向粘弹性位移解析表达式,同时参考相关文献关于西原模型的蠕变参数的时间关系,进一步获得了考虑西原模型蠕变参数时间效应的围岩径向位移的粘弹性解。通过算例对比计算表明:考虑西原模型蠕变参数时间效应关系时,其最大径向位移值要大于不考虑蠕变参数时间效应的情况,说明模型分析的围岩达到稳定状态的时间要比不考虑时间效应的情况长。通过实际工程案例的监测结果和理论计算结果对比,发现二者随时间的变化趋势是一致的,实际的位移变化要比理论计算结果大,二者的误差在18%~26%。
Based on a K-B Model, an analytic expression for the radial viscoelastic displacement of surrounding rock under an asymmetric load is established by way of the correspondence principle. Based on the records of the time-dependent creep parameters for the K-B model in relevant literatures, a viscoelastic solution for the radial displacement of the rock mass considering the time effect of the creep parameters of the K-B Model is obtained. A comparison of data shows that the maximum radial displacement considering the time effect of the creep parameters is larger than that which doesn＇t consider it, and this indicates that it takes longer for the rock mass to reach a steady state in the former case compared with the latter one. According to a comparison between practical monitoring resuits and theoretical calculation results, it is determined that the laws of variation with time for both cases are consistent and the actual displacement is larger than the theoretical one, with an error scope of 18% to 26% .
出处
《现代隧道技术》
EI
CSCD
北大核心
2017年第6期77-84,共8页
Modern Tunnelling Technology
基金
国家自然科学基金(51308424)
中南大学高速铁路建造技术国家工程实验室开放基金(HSR2013006)
关键词
西原模型
对应原理
围岩
位移
蠕变
粘滞参数
粘弹性解
K-B model
Correspondence principle
Surrounding rock
Displacement
Creep
Viscous parameters
Viscoelastic solution
