陕南岚皋县柳家坡滑坡形成机制研究

FORMATION MECHANISM OF LIUJIAPO LANDSLIDE IN LANGAO COUNTY, SOUTHERN SHAANXI PROVINCE

柳家坡滑坡位于陕西岚皋县城北,属松散坡积物类滑坡。滑体为粘质砾砂土,渗透性差,受动水压力作用易发生流土;滑床为泥板岩和片岩。滑体和滑床工程地质性质差异明显,二者界面为滑体下滑的主滑面。该滑坡为一古滑坡,曾多次发生变形滑动,2003年在连续强降雨和坡脚切坡等因素诱发下重新活动,目前处于欠稳定状态,若遇强降雨仍有可能发生整体失稳。对陕西南秦岭区域滑坡调查表明无论是滑坡类型,还是滑坡体物质组成及变形规律,柳家坡滑坡在陕南都具有一定的代表性。

Liujiapo landslide is located at the northern Langao County of Shanxi Province. It is a landslide of loose deposits type. The slide is consisted of clayey gravelly sand with low permeability. The sand is easy to occur seepage deformation under the dynamic hydraulic pressure. Mud - slate and schist with shallow weathering depth constitutes the bedrock under the landslide. So the difference in the engineering properties between the sliding mass and the sliding bed is evident.. The interface is the main slip face of the landslide. The landslide is an old that had occurred to deformation and slide many times. Removement of the landslide resulted from influence factors such as continual strong rainfall and cut slope so on in 2003. The landslide is unsteady at present. If it encounters strong rainfall, it will occur to lose its integer stability. The survey for regional landslide shows that Liujiapo landslide can be a representative in southern Qinling in terms of landslide type or substance composition and deformation rule.