清江地区堆积体滑坡破坏特性及安全预警

Failure properties and safety warning of talus landslide in Qingjiang area

分析累计变形～深度曲线、相对变形～深度曲线和相对变形～时间曲线，得出堆积体滑坡的变形破坏特性，即堆积体滑坡破坏前变形量大；堆积体滑坡变形和破坏的历时长；降雨是导致堆积体滑坡变形的主要外部因素；变形和破坏自主滑动面开始自下而上向滑动带的上盘渐近发展等。根据变形和破坏的特性，提出了阶段可控的滑坡稳定性安全预警标准，指出以主滑动面的抗剪参数作为滑坡稳定性设计的依据，参数过低、裕度过大，应按考虑整个滑动带作用在内的综合抗剪参数进行设计，才更符合滑坡的实际情况。

Based on analysis of deformation curves of talus landslides, including the accumulative deformation-depth curve, the relative deformation-depth curve and the relative deformation-time curve, the main failure properties of talus landslides are obtained. It is concluded that the total amotmt of deformation is larger and the growth of deformation is very slow before the landslide occurs, rainfall is one of the main external factors leading to talus landslides, the original deformation starts from the bottom wall （main sliding surface） and the development of deformation is progressive from the bottom wall up to the top wall. According to these properties discovered recently, a safety forecast standard is proposed. It is pointed out that considering only the shear strength parameters of the main sliding surface is not enough; taking comprehensive shear strength parameters of the entire sliding zone into account is more reasonable for the design of slide stability.