碎石土滑坡变形机理及稳定性分析

某高速公路隧道进口段位于古滑坡体上，隧道施工中滑坡体后缘出现了变形裂缝，对施工人员及财产安全构成严重威胁。按工程勘察资料和现场地质条件调查结果，对滑坡体的变形失稳机理进行了分析；并通过施工过程中隧道仰坡以及滑坡体整体稳定性计算，得到古滑坡体的局部和整体稳定性。研究结果表明:仰坡后缘以及隧道的变形迹象是因刷坡过程中开挖了坡脚，仰坡出现大幅度变形造成的。施工过程中，仰坡段的稳定性差有可能发生失稳，隧道底板以下滑坡体稳定性未受到大的影响。在研究结果的基础上，制定了对滑坡的治理措施，效果较好，保障了安全。

Deformation Mechanism and Stability Analysis of Debris Landslide

The entrance section of a highway tunnel is located on the ancient landslide.During the tunnel construction，deformation cracks appeared at the rear edge，which pose a grave threat to life and property of construction personnel.Based on engineering investigation data and field geological survey，the mechanism of landslide deformation and instability was analyzed，and by calculating the stability of tunnel upward slope and the landslide body，the local and global stability thereof was obtained.The study results show that the deformation of both the rear edge of the upward slope and the tunnel is due to occurrence of the large deformation of the upward slope caused by excavation of the slope toe in the process of slope scouring；the slope has such poor stability that it may fail in the construction，while the landslide body under the tunnel floor has the stability not affected too much.Based on the study result，the control measures for the landslide is formulated，which give good effect and security.