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EVALUATION ON CAUSES AND CONTROL EFFICIENCY OF RAINFALL-INDUCED LANDSLIDE AT BEE FARM IN ILI
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摘要: 伊犁种蜂场滑坡受自然降雨以及人类工程活动切坡影响，对下部居民及各类设施造成严重威胁，目前该滑坡已完成防治项目，但其成因机制与致灾机理仍不明晰，防治工程效果如何也没有得到很好的评价。鉴于此，本文以种蜂场滑坡为研究对象，通过野外地质调查、无人机航拍、D-InSAR技术、室内试验及理论分析等多种手段，探明了种蜂场降雨型滑坡成因机制与失稳模式，评价了其防治工程效能。研究结果表明，工程活动切坡导致坡体失去重要阻滑段产生临空面，粉土表部节理、裂隙、虫孔和根孔的发育为降雨入渗提供了优势通道，丰富的自然降雨通过入渗表部土体和抬升地下水位促使坡体内部滑移面的生成，该滑坡属于典型的降雨型滑坡，其失稳模式为牵引式渐进破坏模式。通过D-InSAR技术监测分析，该滑坡工程防治前地表形变量变化范围为36~44cm ·a-1，防治后地表形变量变化范围-4~4cm ·a-1，地表形变量明显减小，同时结合现场调查情况分析，得出种蜂场滑坡防治效果明显。本文成果丰富了伊犁降雨型滑坡的研究，也为该地区同类型滑坡灾害防治提供参考及借鉴。Abstract: he landslide at a bee farm in Ili was affected by natural rainfall and human engineering activities cutting the slope,which posed a serious threat to the lower residents and various facilities. At present,the prevention and control measures on the landslide has been constructed. But its disaster-causing mechanism is still unclear. The effect of prevention and control measures is not well evaluated. In view of this,this paper takes the bee farm landslide as an object,and uses various means such as field geological survey,UAV aerial photography,D-InSAR technology,indoor test and theoretical analysis. It investigates the cause mechanism and destabilization mode of the rainfall-type landslide at the bee farm. The effectiveness of the prevention and control measures is evaluated. The results show that the loss of the important slide-stopping section of the slope due to engineering activities and the development of surface joints,fissures,wormholes and rootholes in the chalk soil provide advantageous pathways for rainfall infiltration. The abundant natural rainfall promotes the generation of internal sliding surface by infiltrating the surface soil and raising the groundwater level. The landslide is a typical rainfall-type landslide with a traction-type progressive damage mode of instability. Through the monitoring and analysis of D-InSAR technology,the change range of surface deformation of this landslide are 36~44cm ·a-1 and -4~4cm ·a-1 respectively before and after the prevention and control measures. The surface deformation was obviously reduced. Meanwhile,combined with the analysis of field investigation,it is concluded that the prevention and control effect of the landslide at the bee farm is obvious. The research results of this paper can enrich the theoretical basis of rainfall landslide research in Ili,Xinjiang,and also provide reference for landslide disaster control of the same type in the region.
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Key words:
- Rainfall landslide /
- Causal mechanisms /
- Instability patterns /
- D-InSAR /
- Control effectiveness
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图 1 种蜂场滑坡地理位置图(影像来自Google Earth)
Figure 1. The geographical location map of the bee farm landslide in Ili(Image from Google Earth)
图 3 新源县阿热勒托别气象站2016、2017年1~12月降雨量变化图
Figure 3. The precipitation change map of Areletobe weather station in Xinyuan County from January to December, 2016 and 2017
图 16 研究区防治前后滑坡形变量值
a. 自然状态下(2014~2015)形变量值; b. 防治后(2016~2017)形变量值
Figure 16. Landslide deformation value before and after prevention and control in the study area
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