内蒙古地区马兰黄土隧道围岩及支护特性研究

Study on Characteristics of Surrounding Rock and Support of Malan Loess Tunnel in Inner Mongolia Region

通过对窑沟隧道周边收敛、拱顶下沉、围岩压力、钢拱架内力、喷射混凝土应力和锚杆轴力进行监控量测,了解隧道开挖过程中马兰黄土隧道围岩变形特性及支护结构受力特性。结果表明:施工过程中拱部沉降的量值远大于净空收敛的量值;围岩压力分布不均匀;钢架支护在隧道支护体系中起着非常重大的作用;拱部系统锚杆对结构的稳定性作用不大;水对拱顶沉降的影响非常严重。

Based on the monitoring and measurement of surrounding convergence, vault settlement, surrounding rock pressure, inner force of steel arch support, shotcreting stress and axial force of bolts, which was carried out in Yaogou Tunnel, both the characteristics of surrounding rock deformation and the force characteristics of the bracing structure during the excavation of Malan Loess Tunnel were studied. The results show that during the construction, the amount of vault settlement is far more than that of clearance convergence ; the surrounding rock pressure is distributed unevenly ; the steel arch in the tunnel bracing system plays an important role ; the bolts in the arch system have minor effect on the stability of the structure ; and the impact of water on the vault settlement is very serious.