摘要
为掌握地高地应力破碎围岩隧道支护形式与参数及施工方法,以天平铁路关山隧道为工程实例,结合现场对支护结构的应力量测,运用FLAC3D有限差分软件,对隧道支护结构应力、位移进行数值模拟研究,跟踪研究了支护结构竖向应力、水平应力、竖向位移、锚杆轴力等随着掌子面推进的变化规律,并对现场实测的支护结构随时间变化规律进行研究。结果表明:在掌子面距离监测支护2B范围以内时,支护结构应力增长较大,超过2B范围后,应力增长较小,表明支护结构是稳定的;数值模拟和现场实测规律基本一致,但其大小不尽相同,这是由于数值模拟忽略了节理、地下水等影响因素。
To master the supporting form and parameters and choose the construction method of the high ground stress tunnel,this essay taken the Guanshan tunnel on the Tianping railway as engineering? example,combined the field force measurement of supporting structure,used FLAC3 D finite difference software to study the numerical simulation of the stress and the displacement of tunnel supporting structure. And further study the change rule of the vertical stress,horizontal stress,vertical displacement,the axial force of bolt,and so on with the forward of the constraints,the study of the law of the change of field stress measurement with time. The results shows that: when the distance from the measurement points to the constraints in the range of 0 ~ 2B,the supporting structure stress grows fast; When the distance larger than 2B,the supporting structure stress grows smoothly,and says the supporting structure is stable; the results of numerical simulation basically identity to the field measurement,but still have small difference,and which mainly because the numerical simulation ignore the influence of joint,groundwater and so on.
出处
《南阳理工学院学报》
2016年第2期97-101,共5页
Journal of Nanyang Institute of Technology
关键词
隧道
高地应力
破碎围岩
支护应力
tunnel
high ground stress
broken surrounding rock
supporting stress
