湖北十堰某降雨诱发滑坡的变形特征分析及防治措施

Deformation characteristics and prevention measures of a rainfall induced landslide in Shiyan, Hubei Province

湖北十堰某滑坡具清晰边界特征,历史上已出现多次局部失稳,具有较大的潜在威胁。在未采取防治措施前6个监测点的累计变形值为103.69~197.80 mm,均值为160.68 mm,且地表裂缝也时有发育,即滑坡变形特征显著。在稳定性计算过程中,主滑面Z—Z’剖面在工况1—工况3条件下的稳定系数为1.022~1.172,处于欠稳定—稳定状态,并经变形预测,滑坡变形还会继续增加,且增加速率依旧很大,说明滑坡稳定性后续还会趋于减弱。滑坡防治方案设计为“抗滑桩+排水沟”,且在采取滑坡防治处理后,主滑面的稳定系数为1.345~1.856,均属稳定状态,加之抗滑桩的变形值为19.12~26.80 mm,均在变形控制值范围内,充分说明滑坡防治措施是合理有效的。

Landslides generally have clear boundary characteristics and multiple instances of local instability have occurred in Shiyan in history,posing a significantly potential threat.This paper chooses six monitoring points to analyze landslide deformation characteristics.Before taking preventive measures,the cumulative deformation values of the six monitoring points range from 103.69 to 197.80 mm,with an average of 160.68 mm.Surface cracks have also occasionally developed,indicating significant deformation characteristics of landslides.In the stability calculation process,the stability coefficient of the Z-Z'profile of the main sliding surface ranges from 1.022 to 1.172 under conditions of 1 to 3,which is in an unstable-to-stable state.According to deformation prediction,the deformation of the landslide will continue to increase at very high rate,indicating that the stability of the landslide tends to weaken in the future.The landslide prevention and control plan is designed as"anti-slip pile+drainage ditch",and after taking landslide prevention and control measures,the stability coefficient of the main sliding surface ranges from 1.345 to 1.856,all in a stable state.In addition,the deformation value of the anti-slip pile ranges from 19.12 to 26.80 mm,all within the deformation control value range,fully demonstrating that the landslide prevention and control measures are reasonable and effective.