地震诱发滑坡稳定性分析及监测预警方法研究

5.12汶川地震触发了大量滑坡、泥石流、崩塌等次生地质灾害，位于陕西省汉中市广平镇凤凰山滑坡就是1处典型的震动触发破坏。由于滑坡点距离震源点较近，地震波是导致本次滑坡的主要控制因素。首先，经现场调研，应用极限平衡计算软件对边坡在地震前后的稳定性进行了数值计算，确定地震动力响应对边坡稳态的显著影响；然后，根据稳定性分析结果，决定采用SPRM-01型滑坡远程监测系统对凤凰山滑坡体危险区域进行了长达25个月的实时监测；最后，通过对实测数据的系统分析，得出地震诱发凤凰山滑坡后，岩土体内部应力达到新的平衡，潜在滑动面上的下滑力随时间变化趋势平稳，滑坡体处于稳定状态。

Stability Analysis of Landslide Triggered by Earthquake and its Monitoring Early-warning Method

The 5.12 Wenchuan earthquake derived lots of geological disasters such as landslides,mud-rock flow and collapse.The landslide of Fenghuang mountain happened in Guangping town of Hanzhong is a typical destruction triggered by vibration.As the landslide is close to the seismic source,the seismic waves are the main factor for this landslide.Firstly,according to the field investigation,the slope's stability before and after the earthquake was numerically simulated with application of the limit equilibrium calculation software.The seismic response to the stability of the slope was determined.According to the results of stability analysis,the SPRM-01-type landslide remote monitoring system was adopted to real-time monitor the dangerous zone of Fenghuang mountain landslide as long as 25 months.Then,through the systematic analysis on the measured data,the rock soil internal stresses reached a new equilibrium after the earthquake-induced landslides in Fenghuangshan,and the potential decline in power sliding surface trended smooth over time and the landslide kept in a steady state.