长距离输水隧洞稳定性及支护研究

Study on stability and support of long distance water transport tunnel

针对榆林某输水隧洞工程东线,分析其施工期及运营期的安全性和稳定性,利用有限元软件Abaqus建立三维数值模型,研究隧洞的应力和位移状态及围岩状态。同时考虑隧洞在不同内水压力下的最大应力变化,并采取一定的支护措施。结果表明,随着内水压力的增大,隧洞衬砌应力也会增大,且增大速度逐渐增加。运用小导管注浆和锚杆支护能够减缓应力的增长速度,且小导管的效果要优于锚杆支护。

Aiming at the east line of a water transmission tunnel project in Yulin,the safety and stability of the tunnel during construction period and operation period were analyzed,and the three-dimensional numerical model was established by using the finite element software ABAQUS to study the stress and displacement state of the tunnel and the state of surrounding rock. At the same time,the maximum stress of the tunnel under different internal water pressure is considered,and some supporting measures are taken. The results show that the stress of tunnel lining increases with the increase of internal water pressure,and the increasing speed increases gradually. The application of small conduit grouting and bolt support can slow down the growth rate of stress,and the effect of small conduit is better than the rock bolt support.