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降雨是触发斜坡失稳的重要因素。鄂西山地90%的滑坡是降雨引起的,对埋藏较浅的输气管道威胁巨大,为了最大限度的保证管道安全,实现管道沿线滑坡的早期预警,降雨和滑坡之间关系的研究极其必要。文章根据历史滑坡和历史气象数据,分别研究了前期累计降雨量和降雨强度-持续时间(ID)对滑坡的控制,得到了鄂西降雨触发型滑坡的阈值函数,土滑:I=22.14D~(-0.22),岩滑:I=60.07D~(-0.48),其中I是降雨强度,D是降雨持续时间,这一经验降雨阈值将用于以后的预警模型中。
Rainfall is an important factor that triggers the instability of the slope. Ninety percent of the landslides in western Hubei are caused by rainfall, and there is a great threat to shallow burying gas pipelines. In order to ensure the safety of pipelines to the maximum extent, it is extremely necessary to study the relationship between landslides along the pipelines and early warning of landslides. Based on historical landslide and historical meteorological data, this paper studies the control of landslides caused by cumulative rainfall and rainfall intensity - duration (ID) in the past, and obtains the threshold function of rainfall triggered landslides in western Hubei Province. Soil slippery: I = 22.14D ~ (-0.22), rock slide: I = 60.07D ~ (-0.48), where I is the rainfall intensity and D is the duration of rainfall. This empirical rainfall threshold will be used in the later warning model.