滇藏铁路丽江玉峰寺隧道围岩岩爆刚度判据

Rigidity criterion for rockburst in the Yufengsi tunnel in Lijiang City of the Yunnan-Tibet Railway,China

从最小能量原理出发,探讨隧道围岩岩爆的刚度判据问题,并应用于滇藏铁路玉峰寺隧道工程。在滇藏铁路玉峰寺隧道代表性围岩岩样全应力应变刚压实验分析的基础上,结合地应力测量资料和数值模拟,分析玉峰寺隧道3种岩性不同围压条件下的变形破坏过程,得到隧道塑性破坏岩体和弹性岩体的刚度曲线,利用刚度判据,分析评价玉峰寺隧道3类岩体发生岩爆的危险性,玄武岩岩爆烈度最高,灰岩次之,砂岩最低,为隧道工程设计提供了参考依据。

The rigidity criterion for rockburst of the tunnel wall is studied and applied in the Yufengsi tunnel of the Yunnan-Tibet Railway according to the minimum energy theory, On the basis of the rigid compression experiment for complete stress-strain of representative wall rock specimens from the tunnel, combined With the in-situ stress data and numerical simulation results, the failure processes of three rock types at different confining pressures are analyzed and the rigidity curves of the plastic rock mass and elastic rock mass in the tunnel are obtained, Finally, the rockhurst hazards of the three types of rock in the tunnel are analyzed and evaluated using the rigidity criterion, The degree of rockhurst hazards of basalt is highest, next comes that of limestone, and that of sandstone is lowest, This estimation can he used as reference for the tunnel design.