杨家槽滑坡体稳定性位移监测

Monitoring on Stability Against Displacement of Yangjiacao Slide Mass

杨家槽古滑坡，体积约８８０万ｍ３。在清江隔河岩水利枢纽兴建前夕，千余居民迁移到该滑坡体上居住。１９９１年地质初勘确认为基岩滑坡后，开展了滑坡内部和外部变形观测。稳定性监测以仪器监测为主，同时结合地质调查和宏观巡视检查。观测贯穿大堤蓄水前、蓄水期和运行初期全过程，取得了滑坡位移、降雨量、地下水、江水水位之间的相关关系。６年来的大量监测资料表明，杨家槽滑坡体在库水位下降时，滑舌部位仅出现微小向下位移，滑坡整体稳定性尚好，采取适当地表排水措施，可不予搬迁，但必须继续加强安全监测工作。

In order to judge whether more than 1000 inhabitants on the slide mass should be removed away, the systematic monitoring on its stability, including the inner and outside deformation observations, the geologic investigation and macrography, were performed since 1991. The correlations among precipitations, underground water, river levels and slide displacements were obtained during the full impounding process of Geheyan reservoir. A huge amount of monitoring data obtained in the past six years show that only insignificant downward displacement occurred at the front end of the slide mass when the reservoir level droped, but as a whole, the full stability of the slide mass is well. After the proper drainage measures on the earths surface being adopted, the inhabitants may not be removed, but the safety monitoring work must be insisted and strengthened.