山区公路降雨型滑坡区域预警研究

Research on Regional Warning of Rainfall-induced Landslides

详细调查了湖南某施工期高速公路所在区域的滑坡和降雨历史资料,统计分析了该地区滑坡发生与降雨特征的关系。在此基础上,指出采用有效降雨量作为滑坡区域预警指标的必要性。采用饱和与非饱和渗流有限元对该区域典型滑坡体进行了降雨入渗模拟,研究了降雨强度、降雨持时和降雨类型对边坡稳定性的影响,验证和修正了有效降雨量经验模型。将修正后的有效降雨量模型与滑坡发生的历史频率曲线相结合,得到了该区域降雨型滑坡预警等级模型。最后基于实时雨量监测信息,对该高速公路进行了滑坡区域预警,验证了该方法和模型的可行性。

Historical data of landslides and rainfall in western Hunan are investigated,and the relationship between rainfall and rainfall-induced landslides is analyzed statistically.The conception of effective rainfall is suggested to use as the landslides regional early warning index.Transient seepage finite element method is used for the rainstorm infiltration simulation of typical landslide.The empirical effective rainfall model is verified and modified by studying the effects of rainfall on slope stability.The regional early warning model of rainfall-induced landslides are obtained by the combination of modified effective rainfall model and the probability curve of historical landslides.In the end,according to the real-time rainfall information,the early warning information of one highway is released timely.The results also indicate that the model and system operations can be well applied in early warning of rainfall-induced landslides.