A New Early Warning Criterion for Assessing Landslide Risk

A large number of engineering examples show that the displacement speed ratio(DSR) warning criterion derived from displacement as a single base information can predict the occurrence of landslides, but cannot identify the future development direction of landslides, which leads to false alarms in the warning system. In order to solve this problem, a trend speed ratio(TSR) is proposed, taking five landslides as examples, and the research results show that when the TSR is greater than 2.0, the landslide is destroyed; when the TSR shows a decreasing trend, the landslide tends to be stabilized; and for the undamaged stepped landslide, the TSR is always less than 2.0 at the stepped acceleration inflection point of the landslide. Compared with the traditional method, the new method can identify the development direction of the landslide, and can perform a risk assessment of the stepped landslide, which provides new technical support for engineers engaged in landslide warning and prevention.