隧道上覆易滑塌坡体失稳控制研究

Research on the Instability Control of the Overlaying Easy Sliding Slope of Tunnel

为揭示隧掘进过程中对上覆不稳定岩体边坡的影响,通过建立模型模拟隧道掘进过程中隧道上覆坡体的变形移动规律。在此基础上提出管棚预注浆"T字梁"支护结构,控制易塌陷坡体移动变形。通过对该结构存在与不存在2种情况,分析隧道上覆岩体边坡中产生失稳滑塌机制及前后的力学性质,论证该支护加固措施是否有效。结果表明:管棚预注浆"T字梁"支护结构能有效控制易塌陷坡体滑移及应力变化对隧道挤压破坏影响,有效地缓解了掘进隧道过程中坡体不稳定性。

In order to reveal the effects of tunnel excavation to the overlaying instability rock slope,the movement and deformation law of the overlying rock slope of tunnel in the process of tunnel excavation is researched by establishing related model.Based on this,the pre-grouting pipe roof'T-beam'supporting structure is put forward,to control the movement and deformation easy sliding slope.The mechanical properties generate instability before and after the slump mechanism and the overlying rock slope of tunnel are analyzed to demonstrate the support reinforcement measures are effective in the case of the structure exists and does not exist.The results show that'T-beam'supporting structure can effectively control the effects of the slip and stress change of the easy sliding slope to tunnel extrusion damage,therefore,the instability of the slope in the process of tunnel excavation.