湿陷性黄土区某长输管道黄土陷穴灾害研究

The Study on the Loess Sinkhole Hazard Along a Long-distance Pipeline in the Collapsible Loess Area

通过对某油气管道(兰州至渭源段)沿线黄土陷穴的研究,较系统的分析了该线黄土陷穴发育规律及管沟黄土陷穴的成灾原因、致灾过程和机理,认为该线黄土陷穴发育具有一定的规律性;其成灾的本质原因为填土土体强度低,此外气候水文条件和微地形地貌也是主要因素;并初步将陷穴致灾过程划分成4个阶段及定性地分析其在3类微地貌单元的3种致灾机理,为长输管道沿线黄土陷穴灾害的防治提供依据。

Through the research on the Loess-sinkhole along oilgas pipeline（from Lanzhou to Weiyuan）, a more systematic anal- ysis is made on the law of the loess-sinkhole and the reasons for the disaster, disaster-causing mechanism and process of Loess- sinkhole along the ditch, it is thought that Loess-sinkhole development along the line has a certain regularity~ the nature of the reasons for the disaster is the low intensity of the fill soil, in ad- dition, climate and hydrological conditions and micro-topography are also major factors~ the sinkhole hazard is initially divided into four stages, and qualitative analysis on the three disaster-causing mechanism is made on the three micro-topography units, which provide the basis for the prevention and treatment for the Loess sinkhole disaster along long-distance pipelines.