FLAC3D技术在锚杆"耦合"支护工程中的应用研究

隧道开挖后的支护结构设计,唯有在充分考虑原岩条件的支护设计,并确保支护体系、支护结构和参数以及施工工艺过程与围岩变形力学特性相适应、相匹配的条件下,才能达到最大限度发挥围岩自承能力和支护体系支承能力,达到控制围岩变形、维护隧道稳定的目的.亦即唯有使支护设计与原岩条件达到一定程度的"耦合"关系,才能既满足隧道围岩的稳定要求,也同时达到经济合理的目的.文章结合襄武段联拱隧道具体工程条件,就隧道锚杆支护设计与原岩条件的"耦合"问题借助FLAC3D数值模拟技术进行研究,得出了锚杆弹性模量为围岩体等效变形模量的250倍时,锚杆支护刚度就与围岩体强度达到"耦合"状态的结论,为合理设计隧道锚杆支护结构提供了可靠依据.

Application and Study on Coupled Supporting of the Anchor in Tunnel Engineering by FLAC3D

For making the design much more safe and economical,the supporting design of the excavated tunnel need assure the supporting structure and supporting parameters to fit in with the construction course and rockmass deformation peculiarity.In this condition the self-supporting of rockmass can be made thoroughly to maintain the stability of the tunnel.In other words the design conception about coupling between physical mechanic parameters of the supporting structures and rockmass must be considered sufficiently,the design may achieve much more economical utilization.In this paper the coupled supporting of the anchor in tunnel engineering was studied by FLAC3D.the advantageous conclusion about the anchor elasticity module is equal to 250 times of the rockmass' one and the supporting effect can be the best.It provides reliable argument for supporting design of the tunnel.